2024 P0430 f150

Here are the most common causes of P0430 in the Ford F150: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 sensor wiring; PCM issue; Overheating converter (usually caused by a misfiring engine, there should be codes) Burning oil (overheats converter, usually no code) Engine not heating up enough. Mdm noodles menu

2004 - 2008 Ford F150 - OBD Trouble Code P0430 - This is the only code coming up right now. Recent relevant history is that 3 weeks ago I changed out 8 old plugs that were in horrible shape (electrode worn down resulting in overgap) and causing truck to run rough and cough/spit at high rpm. Truck had 67k mi on it. 7...The P0430 fault code is a common one, and it stands for catalyst system efficiency below the threshold (Bank 2). This means that the catalytic converter on bank 2 exhaust manifold isn’t functioning efficiently and is sending excess pollution into the environment. There are a couple of things that can cause the P0430 code, and the check engine ... We would like to show you a description here but the site won’t allow us. Oct 5, 2017 · Chasing a P0430 Code 2011 Ecoboost. New to the forum and I am chasing the cause of an 0430 code. Bank 2 Efficiency below threshold. I have the Torque Pro app on my phone and an ELM connected. First thing I did was check the voltage of the O2 downstream sensors. Bank 1 was steady. 2009 - 2014 Ford F150 - F150 vs. Oklahoma Tornado - Saw this article on Fox News... Pretty sweet! Glad to know I own the same gen. F-150 as this guy!Essentially a code P0430 is telling you that your catalytic converter isn’t converting enough exhaust into water – which is what it’s supposed to be doing. Understanding how the system works is critical to understanding what this code is telling you. Your exhaust system has two oxygen sensors, one before the catalytic converter and one after.2004 - 2008 Ford F150 - 2004 F150 5.4L 4WD P0430 code - So I was driving home tonight in rush hour traffic cruising about 55 and I got a check engine light. No change in performance, no misfire, no rough idle, nothing but the light. Went by AutoZone to have the code read, turns out P0430 bank 2 cat issue. Any ideas...2015 - 2020 Ford F150 - 2017 3.5L Ecoboost P0430 Code - Dashlight light again. Used AutoZone reader and it hits on P0430. As I understand it, that's O2 sensor or Cat Convertor. Engine running fine. No loss of power or milage. I put in a bottle of Cataclean today and filled up with 93 octane but light is still on....The P0430 on the Ford f150 code is associated with the catalytic converter system efficiency in bank 2. This catalytic converter is the storage of heated oxygen. When the oxygen storage capacity is high, it shows a low switching frequency for oxygen sensor 2. If the oxygen storing capacity reduces, the switching frequency increases.Jun 9, 2022 · Unless the CAI is messing up your MAF signal, the ECU will account for any and all air coming into the engine. 2009 - 2014 Ford F150 - Returning Code: P0430 - Hello all, I have a 2014 Ford F150 5.0 with 59,5xx miles. About a month ago I was driving a short distance and noticed a slight rattle like sound. Service Repair. The real cause of P0420/P0430 DTCs. Dec. 10, 2021. The 'Catalytic Converter Efficiency' codes might imply a failed converter, but odds are the …#p0420 #p0430 #catalyticconvertercodes #badcat #autel #motoragetrainingThe “Catalytic Converter Efficiency” codes, P0420 and P0430, are among the top 10 DTCs...2015 - 2020 F150 - P0430-00 Catalyst System Efficiency Below Threshold (Bank 2 - Good day, one of my trucks had this code along with 1 or 2 others, needed a bunch of work which i completed a few weeks ago. since i got her back together this code came back up and i cant figure it out. everything else is working great,...If you’re in the market for a used Ford F150, it’s important to know what to look for when searching for one near you. The Ford F150 is one of the most popular pickup trucks on the...Aug 17, 2023 · The exact definition for the P0430 code is “Catalyst System Efficiency Below Threshold Bank 2”. This practically means that the catalytic converter on bank 2 exhaust manifold isn’t working as it should. That results in increased bad emissions being released into the atmosphere. AZYO: Get the latest Aziyo Biologics stock price and detailed information including AZYO news, historical charts and realtime prices. Wells Fargo raised the price target for Enovi...The P0420 and the P0430 codes are caused by catalyst inefficiency. Replacing your catalytic converter is costly, so, knowing if a new catalytic converter is needed pays off. Your car’s exhaust system (below) comprises: a catalytic converter (s), at least two oxygen sensors and exhaust pipes that route the engine’s exhaust from the …Te suministramos todo lo que necesitas saber sobre el código DTC P0430 Descripción, causas, síntomas y posibles soluciones. LEER SOLUCIÓN DEL CÓDIGO O...by pete59edsel » Wed Oct 31, 2007 9:25 pm. P0420--The simplest thing to do is to reset the code and see if it comes back. Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). The voltage should be low , steady (~200mV, depends on the vehicle). If the voltage varies ( 100mV to 500mV) then it's ...Apr 11, 2022 · Joined Apr 11, 2022. 3 Posts. Discussion starter · #1 · Apr 11, 2022. Hello, I got P0430 (catalyst efficiency below threshold) 2 days after the spark plug change. I changed the spark plugs but didn't change the coils. OBD2 scanner can't detect any misfires, but sometimes RPM is not constant at idle. Also, I observed a 25% decrease in MPG. Code P0430 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by the vehicle. P0430 …Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150; 2015 + Expedition & Navigator; 2007 - 2014 Expedition & Navigator; 1997-2006 Expedition & Navigator; ... 2016 F150 Ecoboost 3.5 P0420 and P0430. poofyo101. 2015 - 2020 F150. 24. 04-16-2019 10:14 PM. Still major trouble. Graham1222. 1997-2006 Expedition & …Unless the CAI is messing up your MAF signal, the ECU will account for any and all air coming into the engine. 2009 - 2014 Ford F150 - Returning Code: P0430 - Hello all, I have a 2014 Ford F150 5.0 with 59,5xx miles. About a month ago I was driving a short distance and noticed a slight rattle like sound.The OBD-II trouble code P0430 is a generic code that translates to "Catalyst System Efficiency Below Threshold (Bank 2)". This code appears when the Engine Control Module (ECM) detects that the catalytic converter is not working as efficiently as it should be. ... P0430 Ford F150 – Code Meaning, Causes, Symptoms, & Fixes. August 31, 2023 …Apr 30, 2021 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code FORD P0430 Saving Repair... 2015 - 2020 Ford F150 - Question about P0430 - Hi everyone! I have a 2018 3.5L truck with over 100K miles. The check engine light is on, indicating Code P0430. Is it possible that the catalytic converter has failed?The P0430 fault code is a common one, and it stands for catalyst system efficiency below the threshold (Bank 2). This means that the catalytic converter on bank 2 exhaust manifold isn’t functioning efficiently and is sending excess pollution into the environment. There are a couple of things that can cause the P0430 code, and the check engine ...Schizophrenia's episodes aren't constant. They come for a period and fade with the help of medication and therapy. When symptoms of schizophrenia occur after being managed for some...P0430 is a diagnostic trouble code (DTC) for "Catalyst System Efficiency Below Threshold (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic ...P0420. Mechanic checked o2 sensors and said they were still ok. We ended up replacing the cat as it was below threshold with an OEM Ford Cat. Cleared the code, drove for 30 miles and CEL comes …2015 - 2020 F150 - 2016 F150 Ecoboost 3.5 P0420 and P0430 - Just bought 2016 F150 Ecoboost last week with 138k miles. Drove it home a few hundred miles and no issues Few days later CEL with P0420 Mechanic checked o2 sensors and said they were still ok. We ended up replacing the cat as it was below threshold with an...If the vehicle exhibits DTC P0430 replace the left bank catalytic converter. Refer to WSM section 309-00. Proceed to Step 2. Reprogram the PCM to the latest calibration using IDS release 77A.03A or higher. This new calibration is …First Name Bret Joined Aug 27, 2022 Threads 10 Messages 1,016 Reaction score 1,046 Location Houston Vehicles 22 F150 XLT Powerboost FX4 302A Oxford WhiteA Ford F150’s fuel tank capacity varies between 23 and 36 gallons depending on whether or not the purchased vehicle is standard or extended range. The Ford F150’s cab style also af...2009 - 2014 Ford F150; 2012 Ecoboost P0430 Again; Topic Sponsor. 2009 - 2014 Ford F150 General discussion on 2009 - 2014 Ford F150 truck. Sponsored by: 2012 Ecoboost P0430 Again. Reply Subscribe . Thread Tools Search this Thread 03 …Surfers in Huntington Beach decided that 65 people on a surfboard just wasn't enough. THE HISTORY AND CULTURE OF HUNTINGTON BEACH is so steeped in surfing that this So Cal beach to...Dec 10, 2021 · Even slight variations in the air/fuel mixture will cause the converter temperature to rise significantly. The “Catalytic Converter Efficiency” Diagnostic Trouble Codes (DTCs) P0420 and P0430, are among the top 10 DTCs technicians face. And while the description might imply a failed converter, odds are the ultimate fault lies somewhere else. 1997 - 2003 F150 - 97 f150 4.6l cel p0430 - I have a 97 F-150 Supercab, 4.6L (W). This past weekend the CEL came on and when I pulled the code it was P0430. I have replaced the spark plugs, PVC, spark plug wires, checked the cats, replaced the EGR valve and sensor, cleaned clogged EGR ports, replaced the fuel filter,...2015 - 2020 Ford F150 - Intermittent power loss, low RPM, followed with P0345 and P0349 - Hi, long time lurker. Scratching my head on the following issue and looking for some guidance, thank you. Issue: Intermittent power loss followed by P0345 and P0349 DTCs. Has happened on 4 occasions, 3 of the 4 were at altitude...2015 - 2020 F150 - 2019 F-150 5.0L - P0430 - Catalyst System Efficiency Below Threshold (Bank 2). I've read where this may be the cat being bad, but I don't have any power loss, fuel economy is still 16 city and about 19 highway. I'm thinking it is the O2 sensor, but I'm not sure what side bank 2 is. I've read...Went ahead and replaced both with CVF Stainless Steel Catted Downpipes and Big Daddies Garage Mini CAT O2 Sensor CEL Fix spacer on the each rear O2 sensors. Within a few minutes of driving, I now have P2096, P2098, P0430, P0420 codes and it seems to surge/bog down slightly at idle. Also seems a little more laggy than before.P0420, P0430. Jump to Latest Follow Status Not open for further replies. 1 - 20 of 30 Posts ... F150Ecoboost.net is the best Ford F150 Ecoboost Forum with discussions on 2011+ F150 Ecoboost Trucks. Discuss performance mods, towing questions, wheels, tires, lift kits, and much more!2004 - 2008 Ford F150 - OBD Trouble Code P0430 - This is the only code coming up right now. Recent relevant history is that 3 weeks ago I changed out 8 old plugs that were in horrible shape (electrode worn down resulting in overgap) and causing truck to run rough and cough/spit at high rpm. Truck had 67k mi on it. 7...Restore your catalyst system and learn how do I fix trouble code P0430? This diagnostic trouble deals with your emissions system and alerts you to a potential issue with a bank two oxygen sensor. Learn how to diagnose, troubleshoot and solve this issue today.General F150 Discussion - CVF catted down pipes throwing cel codes P0420 & P0430 - Just installed CVf catted down pipes was good for 2 days and now I’m getting 2 codes P0420 & P0430, have cat back exhaust, catch can, turbo inlet tubes AMS, catch can, cold air intake open element, and 5-star 93 performance tune for...Tech Notes. As the code description implies, the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the catalytic convert needs to be ...2004 - 2008 Ford F150 - 05 5.4l Runs great Code P0430 Help! - Accidentally bought an 05 F150 Lariate at auction. 5.4l with 172k. Pretty clean and ran great. No repair history. Put some Berryman's infector clean in and filled tank. After 80 mi. CEL comes on P0430. I've changed oil 5-30 synth blend, sparkplugs...2015 - 2020 Ford F150 - Replacing Cats and O2 sensors help - 2019 F150 XLT crewcab 4X4 3.5L Ecoboost with 82,500 miles. Got the P0430 code. Not covered under the Ford warrantee. Purchased it used, first F150 I have owned. After much research and getting Forscan, went about diagnosing the problem. After checking the O2...As the code description implies, the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).Jul 5, 2022 · The P0430 on the Ford f150 code is associated with the catalytic converter system efficiency in bank 2. This catalytic converter is the storage of heated oxygen. When the oxygen storage capacity is high, it shows a low switching frequency for oxygen sensor 2. If the oxygen storing capacity reduces, the switching frequency increases. As such, an F-150’s catalytic converters could easily eclipse in expense compared to a Smart car. So, ... Diagnostic Trouble Code (DTC) P0430 indicates that the catalytic converter’s efficiency in bank 2 is below the threshold. The catalytic converter’s function is to eliminate or reduce harmful emissions, and it has a catalyst efficiency ...AMC stock is heating up today on some unprecedented news. A hedge fund has taken out a significant long position in the theater play. Even institutional investors are warming up to...SYMPTOM. The MIL comes on with DTC P0430 (front bank catalyst system efficiency below threshold [bank 2]). Additionally, one or more of the following DTCs may be stored: P030X (misfire) P219A (air-fuel ratio variation of cylinder [bank 1, rear bank]) P219B (air-fuel ratio variation of cylinder [bank 2, front bank])Aug 31, 2023 · P0430 Symptoms. Some common symptoms associated with the P0430 code include: Check Engine Light: The most common symptom of the P0430 code is the Check Engine light illuminating on the dashboard. Decreased Fuel Efficiency: A malfunctioning catalytic converter can lead to decreased fuel efficiency. Decreased Performance: A damaged or clogged ... For More Info visit us at: http://1aau.to/h/cvP/Is your Check Engine Light on? The trouble code P0430 suggests there might be a problem with your catalytic c...General F150 Discussion - 2015 F150 3.5 Ecoboost P0420 code - Hello, I am looking for help to figure out this problem. I have the 2015 Platinum, 3.5 ecoboost with 85k miles. ... When I was chasing a P0430 I finally realized that was there and it flat out told me the driver side cat oxygen capacity was out of range. Can't hurt to try it and ...I keep getting a P0430 code on my '12 F-150 ecoboost with 110,000 miles on it. Here is the entire code: P0430 ... F150Ecoboost.net is the best Ford F150 Ecoboost Forum with discussions on 2011+ F150 Ecoboost Trucks. Discuss performance mods, towing questions, wheels, tires, lift kits, and much more!What does DTC P0430 mean on a Ford F-150? OBD Code P0430 is a generic OBD II Code – meaning that it applies to every applicable vehicle manufactured since the year 1996. The steps associated with diagnosis & repair often vary from model to model but the code applies means roughly the same thing on every vehicle it shows up on. In this article ...2009 - 2014 Ford F150 - F150 vs. Oklahoma Tornado - Saw this article on Fox News... Pretty sweet! Glad to know I own the same gen. F-150 as this guy!3.5L EcoBoost Engine - P0430 code - Have gotten the dreaded P0430 code. I checked the temp of the exhaust pre cat and post cat. The temp is hotter on the downside of the the Cat, so that should mean the Cat is ok right? I changed the O2 sensor, but still getting the code. Going to clean the MFS sensors this afternoon...2009 - 2014 Ford F150 - PO430 Code - Today, my 2012 f150 with a 5.0 litre engine threw a PO430 code (catalyst system efficiency below threshhold bank 2). The truck only has a bit over 21,000 km. on it. Yesterday, to avoid an accident, I had to accelerate much harder than usual to avoid an oncoming vehicle. Other than...Jul 24, 2017 · Received 6,199 Likes on 4,672 Posts. P0430 - Catalyst System Efficiency Below Threshold (Bank 2) Description: This DTC sets when the bank 2 catalyst system efficiency is below the acceptable threshold. Possible Causes: Use of leaded fuel. Damaged heated oxygen sensor (HO2S) Out of range engine coolant temperature (ECT) sensor. High fuel pressure. What does DTC P0430 mean on a Ford F-150? OBD Code P0430 is a generic OBD II Code – meaning that it applies to every applicable vehicle manufactured since the year 1996. The steps associated with diagnosis & repair often vary from model to model but the code applies means roughly the same thing on every vehicle it shows up on. In this article ...The P0420 and the P0430 codes are caused by catalyst inefficiency. Replacing your catalytic converter is costly, so, knowing if a new catalytic converter is needed pays off. Your car’s exhaust system (below) comprises: a catalytic converter (s), at least two oxygen sensors and exhaust pipes that route the engine’s exhaust from the …Small business owners in New York, New Jersey, Connecticut, Massachusetts and Pennsylvania have until June 6 to apply for (SBA) EIDL related to Hurricane Ida. Small business owners...Nov 12, 2022 · First Name Bret Joined Aug 27, 2022 Threads 10 Messages 1,016 Reaction score 1,046 Location Houston Vehicles 22 F150 XLT Powerboost FX4 302A Oxford White To diagnose the P0430 2001 Ford F150 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Received 11 Likes on 10 Posts. Code P0420 in 2018 2.7L. Check engine light came on and reader indicated Code P0420... O2 sensor catalyst system efficiency below threshold. My truck, an '18 2.7L 2wd with 13.5k miles on the odometer has been a great vehicle. Luckily, it's under warranty, but I'm not instilled with a lot of confidence.2015 - 2020 Ford F150 - Intermittent power loss, low RPM, followed with P0345 and P0349 - Hi, long time lurker. Scratching my head on the following issue and looking for some guidance, thank you. Issue: Intermittent power loss followed by P0345 and P0349 DTCs. Has happened on 4 occasions, 3 of the 4 were at altitude...=====Claim your FREE error code eraser 👉 https://free.nonda.co 👈== How to Fix P0430 Error Code ====Error Code P0430 Saving Repair ...I have a 2013 F350 Crew Cab Long bed xl with 128000 miles on it. I just barely bought it from a small dealer and had a check engine light come on for the cats. (P0420 and 0430) I have spoke with the dealer and he assured me that he would replace the cats. He stated he had O2 sensors replaced and thought he had fixed the problem.2015 - 2020 Ford F150 - P0430 code - I just bought my first F150 last month. I am 60 y/o and have always owned Chevy's. I will start by saying I LOVE THIS TRUCK! It is a 2019 F150 XLT crewcab 4X4 with the 3.5L Ecoboost. It has 80,000 miles. I drove it 5hours home, no problems. I changed the oil, oil filter, air...If the vehicle exhibits DTC P0430 replace the left bank catalytic converter. Refer to WSM section 309-00. Proceed to Step 2. Reprogram the PCM to the latest calibration using IDS release 77A.03A or higher. This new calibration is …This page is meant to help you troubleshoot the Ford F250 P0430 trouble code. It covers the P0430 code's meaning, symptoms, causes, and possible solutions. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. P0430 is usually caused by a catalytic converter issue or a bad O2 sensor. Table of ContentsAug 19, 2020 · 16 Posts. #2 · Aug 19, 2020. You need to watch what the o2 sensors on bank 2 are doing when at operating temp. The upstream switches quickly the downstream switches slowly when the cat is working properly. When the cat is worn out rear o2 will switch quicker. Compare it to the reading on the other bank. The P0430 fault code is a common one, and it stands for catalyst system efficiency below the threshold (Bank 2). This means that the catalytic converter on bank 2 exhaust manifold isn’t functioning efficiently and is sending excess pollution into the environment. There are a couple of things that can cause the P0430 code, and the check engine ...Te suministramos todo lo que necesitas saber sobre el código DTC P0430 Descripción, causas, síntomas y posibles soluciones. LEER SOLUCIÓN DEL CÓDIGO O...Understanding and Diagnosing the Engine Code P0430. Diagnostic Trouble Code (DTC) P0430 indicates that the catalytic converter’s efficiency in bank 2 is below the threshold. The catalytic converter’s function is to eliminate or reduce harmful emissions, and it has a catalyst efficiency monitor (CEM) that uses two oxygen sensors.Nov 12, 2022 · First Name Bret Joined Aug 27, 2022 Threads 10 Messages 1,016 Reaction score 1,046 Location Houston Vehicles 22 F150 XLT Powerboost FX4 302A Oxford White

2015 - 2020 Ford F150 - P0430 Troubleshooting - Truck: 2015, 5.0, 251k miles. Original cats. Getting the p0430 code. Checked Pre/Post cat temps, both cat's registered about a 40-50 degree jump. Ran a graph using forscan on Bank 1 vs Bank 2, but I'm not sure the results really tell me much. I'll put a screen shot.... Happy birthday steelers pictures

Service Repair. The real cause of P0420/P0430 DTCs. Dec. 10, 2021. The 'Catalytic Converter Efficiency' codes might imply a failed converter, but odds are the …2015 - 2020 F150 - 2016 F150 Ecoboost 3.5 P0420 and P0430 - Just bought 2016 F150 Ecoboost last week with 138k miles. Drove it home a few hundred miles and no issues Few days later CEL with P0420 Mechanic checked o2 sensors and said they were still ok.Sometimes an Italian tune up is all we need! P0430 on my '19. I gave it a similar italian tune up while waiting a few days for dealer appt. Code went off but they found it in memory and ran a tsb. Basically a ford approved blowout of the cats with a few WOT accelerations followed by some O2 measurements.Apr 25, 2023 · 2015 ford f150 3.5l ecoboost is throwing a p0430 code every few days, only symptom of anything is coolant below min line. ... F150Ecoboost.net is the best Ford F150 ... I can see the downstream O2 sensor voltages, but the upstream sensors don't show that way. My diag tool does not indicate any misfires. 3.5L EcoBoost Engine - P0430 Code and O2 Sensor Bank Locations - I have a 2013 3.5L V6 Ecoboost. Continuing to get P0430 Code: Catalyst System Efficiency Below Threshold Bank 2.Here's how to bypass or trick the O2 sensor into thinking your catalytic converter is working when you have the P0420/P0430 check engine light code. May or m...Service Repair. The real cause of P0420/P0430 DTCs. Dec. 10, 2021. The 'Catalytic Converter Efficiency' codes might imply a failed converter, but odds are the …Small business owners in New York, New Jersey, Connecticut, Massachusetts and Pennsylvania have until June 6 to apply for (SBA) EIDL related to Hurricane Ida. Small business owners...Ford TSB 22-2260. Some 2018-2020 F-150 vehicles equipped with a 2.7L EcoBoost and 2020-2021 Expedition/Navigator vehicles may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0420 and/or P0430 stored in the powertrain control module (PCM). This may be due to high sulfur content in the fuel.2015 - 2020 Ford F150 - P0430 code - I just bought my first F150 last month. I am 60 y/o and have always owned Chevy's. I will start by saying I LOVE THIS TRUCK! It is a 2019 F150 XLT crewcab 4X4 with the 3.5L Ecoboost. It has 80,000 miles. I drove it 5hours home, no problems. I changed the oil, oil filter, air...Jan 2, 2023 · Maintenance Shop - 2019 F150 2.7l ecoboost P0430 - Hi all, I'm new here and am hoping to find some answers and learn some things. I bought a used 2019 f150 2.7l ecoboost 2 weeks ago with 41,000 miles on it. This afternoon I got on the gas peddle while merging onto the highway and the CEL came on, P0430 code on... This page is meant to help you troubleshoot the Ford F250 P0430 trouble code. It covers the P0430 code's meaning, symptoms, causes, and possible solutions. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. P0430 is usually caused by a catalytic converter issue or a bad O2 sensor. Table of Contents16 Posts. #2 · Aug 19, 2020. You need to watch what the o2 sensors on bank 2 are doing when at operating temp. The upstream switches quickly the downstream switches slowly when the cat is working properly. When the cat is worn out rear o2 will switch quicker. Compare it to the reading on the other bank..

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