Rough idle after o2 sensor change I posted before about the problem and thought it was maybe more than just the O2 sensor. Jun 18, 2008 · Re: Rough idle and black smoke AFTER oil change. Thank you guys Appreciate 0 1992 Corvette LT1 Rough Idle and High Fuel After O2 Sensor Replacement LT1 often faces rough idle and increased fuel consumption after oxygen sensor replacement or ECU issues. Find out when to replace your oxygen sensor for optimal driving experience. You may also notice reduced fuel economy, and the car may fail an emissions inspection. So after 2 sets of sensors, a new MAF and 3 oil changes thanks to your help I have my truck back. Check the Bank 1 Sensor 2 oxygen sensor harness for damage or poor connections. After the replacement, however, following problems occured: 1) Now engine is running rich and the fuel consumption has gone up to about 22 Rough Idling or Stalling: A faulty O2 sensor can cause your Honda's engine to run rough or stall, especially at idle. 6K views 7 replies 3 participants last post by dubyam Jul 11, 2021 Apr 29, 2016 · The idle is smooth and I am about where I was before I changed out the sensors on gas usage. Jeep 93’ 4. Sep 1, 2021 · I have been experiencing rough cold start idle for a while now. So any suggestions of what it might be would be MUCH appreciated. Went back to stock OEM tune for ****s and giggles and my rough idle went away? Oct 8, 2008 · Same issue here, I change Air Filter (Very bad shape it was), cleaned MAF Sensor, cleaned Control Idle Valve (Most tricky to clean), change Ignition Coils, Sparkssame issue. One of the most common See relevant content for sensordiary. Watching this video will help you diagnose to see if it is time to replace your oxygen sensor. A faulty downstream O2 sensor can cause incorrect air-fuel mixture readings, leading to rough idle and triggering the auto start/stop warning. Jan 13, 2025 · 3. At idle, they steadily fall, fluctuate a few times in the middle, and then spoke back up to 0. Here’s why replaced MAF sensor still rough idle happens. Learn other causes like clogged injectors or leaks and how to fix them. May 31, 2019 · Some common signs of bad O2 sensors include poor engine performance, rough idle, reduced fuel economy, and an illuminated check engine light on your truck’s dashboard. Monitor live sensor data with a scan tool to ensure proper oxygen sensor function and Top 4 Reasons Why You Replaced O2 Sensor and Still Have Code The most common codes that people will see in this particular situation are P0134, 0138, and 0139, though you are probably seeing P0420. Here are a couple of the parts to take a look at so that you can perform the diagnosis What happens if you keep driving with a bad O2 sensor? Driving your Mini with a bad O2 sensor can cause sluggish and rough acceleration, along with high fuel consumption and emissions. You Get A Rough Idle Or Your Engine Misfires If your engine is misfiring, it could mean that you have a bad O2 sensor. Still have misfires on 4-6 cylinders. A bad O2 sensor can disrupt combustion and cause misfires. Swap coils around again. Spark plugs and wires, fuel pump and sensors. As such, when it fails or malfunctions, it can cause a variety of issues with engine performance, including rough idling In this video, you will learn 5 symptoms of a bad or failing oxygen sensor (upstream). Inspect ignition coils and wiring harnesses for damage. 8v. Dec 14, 2024 · To fix an O2 sensor, first diagnose the issue with an OBD-II scanner, then replace the faulty sensor. Misfires. GMs with a bad O2 sensor often experience irregular or rough idle. So far it looks like a disconnected intake hose on the intercooler will cause similar issues as well? My O2 Sensor code was for the BACK sensor and I read that one Oct 27, 2020 · The weird thing is that the o2 sensor graphs never change. Ensure you use the correct replacement part and tools for your vehicle model. Keep in mind, however, that these issues can also have other causes that have no relation to the health of a vehicle’s oxygen sensors. If the problem persists after replacing the oxygen sensor and other parts of the system, it’s time to take it back to the shop for further inspection. Again one of the many other causes of poor fuel/air mixtures can also cause this rough idle so you will need to take the clues as a whole before assuming the sensors are at fault. Does this once maybe twice them Mar 17, 2025 · If you notice a check engine light coming on (either constant or intermittently) or your car has a rough idle, then you could also have a faulty O2 sensor. Its primary function is to monitor the oxygen content in the exhaust gases produced by the engine. Clear codes after repairs and monitor live data for sensor readings. Jun 29, 2016 · Mini Cooper 2007-2013: How to Replace Oxygen Sensors Having a faulty oxygen sensor in your Mini Cooper can result in bad emissions, rough idling, and bad fuel consumption. symptoms were right when I turned it on and took of hesitation under acceleration and rough idle at the light. Learn the common symptoms, diagnostic tips, and solutions to keep your engine running smoothly. Check for vacuum hose disconnections and ensure throttle body cleanliness. I'd like to figure out the squeak/very faint knocking noise coming from the belt drive but that's secondary to this. Sometimes an O2 sensor fails, and you need to replace it. Read on to learn how to replace them. (895meztz94) I have an appointment to take it back in the morning and see a mechanic, but I like to go fully armed. Diagnostic trouble codes. A few things that can cause an engine to misfire include Feb 11, 2023 · What To Do After Replacing Mass Air Flow Sensor? In many car models, you can’t simply put a new mass air flow sensor in and expect everything to run smoothly. 0 with years long intermittent minute misfire and rare back fire or knock. Can a bad O2 sensor cause poor . Understanding how an oxygen sensor works, its symptoms when it’s failing and how to diagnose and replace it can help to determine whether this is the cause of a rough idle in your vehicle. The oxygen sensor output is part of the systems that control engine timing, combustion intervals, and the air to fuel ratio. Check Engine Light Illuminates. I've never seen anything like it. O2 sensor codes gone with new downstream sensors. com This is an expired domain at Porkbun. The ECU then adjusts the air-to-fuel ratio to optimize the fuel combustion. You will also Why is the idle still rough after the MAF sensor replacement? If you have replaced the MAF sensor and noticed your car has rough idling, the sensor might be the culprit. No change. If the car still have the dealer limited warranty you have all the right to take it in for repair. Rough idling, bad fuel economy, and a check engine light are all common symptoms of an oxygen sensor problem. Commonly known as the O2 sensor, this component monitors the oxygen levels in Jul 5, 2021 · Running rough after I put new o2 sensors in air intake air intake sensor? cadiliac converter Jump to Latest 1. Thank you guys Appreciate 0 Tweet Quote 05-09-2023, 12:53 PM # 2 mkeiser First Rough engine and misfire clears completely up when O2 sensor is disconnected. #9 – Head Gasket Leak Other symptoms of a bad oxygen sensor include a rough idle, a misfire, and/ or hesitation when trying to accelerate. After replacing the catalytic converter and O2 sensors, resetting the PCM is crucial to clear stored fuel trims and sensor data. High voltage O2 sensor codes after replacement can indicate wiring issues, incorrect sensor type, or exhaust leaks causing false readings. Jun 1, 2024 · 2006 corolla CE 105k KM or 65k Miles on it. Swapped injectors around again. Inspect the catalytic converter’s condition, as a clogged cat can cause rich fuel codes and misfires. After replacing all four O2 sensors, rough idle and misfire codes may result from vacuum leaks, faulty spark plugs, or improper sensor installation. Once you've replaced your vehicle's O2 sensor, you'll need to reset the ECU so it can properly gather information from the new O2 sensor. Can a O2 Sensor Cause Rough Idle in an Automobile? The oxygen sensor, or O2 sensor, measures the amount of oxygen in the exhaust stream of a vehicle. After numerous threads on the boards about what to do about the often-complained-about stalling or rough-idling Altima issue, I thought it would be best to summarize everything into one long FAQ checklist. After replacing both oxygen sensors, the engine may run rich if sensors are faulty, improperly installed, or incompatible. What is an Oxygen Sensor, and What Does it Do? Signs of a Bad Oxygen Sensor in the Chevy Silverado Types of Oxygen Sensor Malfunctions Diagnosing a Bad Oxygen Sensor Apr 29, 2024 · A defective oxygen sensor may not trigger a check engine light, but it can still cause your fuel mileage to go down. These codes do not point out to a specific issue but they can help hint at the root cause of the issue. OLD post So, i switched out the old sensor for the new Denso o2 upstream sensor, and the P0031 and P2238 codes went away but still have a rough Idle only in Sep 26, 2025 · Discover how a bad O2 sensor can cause a rough idle and affect your vehicle’s performance. This allows the computer to relearn sensor data. Verify sensors match OEM specifications. Feb 6, 2025 · An O2 sensor, also known as an oxygen sensor, is a critical component in the vehicle’s exhaust system. When an oxygen sensor or O2 sensor goes bad, it produces different symptoms, such as rough idle, stalling engine, poor fuel economy, unusual noise, poor engine performance, catalytic converter failure, and black smoke from the exhaust, along with an illuminated check engine light. That is why replacing the sensor is important when it comes to your engine’s overall health. These are in no particular order, and Changed fuel pump and replaced o2 sensors. May 9, 2023 · Hey guys, I went to get my o2 sensor bank 2 sensor 1 relaced bc I had code p0050. Now it does the same thing seems like it's about to turn off at idle and under acceleration hesitation. So I change the o2 sensor and when I started the car in the shop it had very rough idle and the RPMs were jumping around. 1-3 pretty clean. Jan 11, 2016 · Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle. Oxygen sensors should be replaced between every 60,000 – 90,000 miles, and in that range, you could see a decline in your fuel economy without a check engine light illuminating. First, you must inspect the installation and reset the trouble codes. You might also notice reduced fuel economy or even fail an emissions test. Inspect the sensor wiring and connectors for damage or corrosion. On immediate start up the idle is fine then after a few seconds as the sensors adjust mixtures the car starts to rough idle for about 20-30 seconds before it smooths out. Jun 23, 2004 · The Definitive Idle/Stall Problem Checklist. Sudden spikes while idling is known as a rough idle and may indicate the O2 sensors are not working correctly. Compression test at approx 170 for cyl 1-4, 155 for cyl 5 & 6 New plugs. After replacing all four O2 sensors, reset the engine control module (ECM) by disconnecting the battery for 15 minutes or using an OBD-II scanner to clear codes. Feb 21, 2025 · Learn how to fix rough idling with step-by-step diagnostics, common causes, and DIY solutions to save money and prevent costly repairs. And if you continue driving for several months, it may lead to engine damage or catalytic converter failure which can cost thousands of dollars to fix or replace. Causes of the P0132 Code In most cases, the P0132 code indicates that there’s trouble with the oxygen sensor, but that’s not all that could be wrong. Will start up and idle well until rpms drop then some vibration Hey guys, I went to get my o2 sensor bank 2 sensor 1 relaced bc I had code p0050. The easiest way of knowing you have a bad O2 sensor is by scanning the ECM for DTCs. Check for vacuum leaks, faulty spark plugs, or dirty fuel injectors that can cause rough running. Do you want to know if a bad O2 sensor causes rough idle? Learn easy signs, fixes, and prevention tips to keep your car running smooth and efficient. One of the most common causes is a faulty oxygen sensor. This happens because the sensor is not providing the ECU with accurate information, making it difficult for the engine to run smoothly. Oct 16, 2013 · The fuel will not burn properly causing the O2 sensor to malfunction along other issues. Feb 12, 2023 · Check Engine Light Rough idle Poor fuel economy Black exhaust smoke Stalling engine In rare cases, there might not be any symptoms other than the Check Engine Light, but this isn’t common. Still runs rough. Is there a procedure I can follow or is a specialised diagnostic tool required? Rougher engine idle. Focus often faces rough idle and acceleration bogging after oxygen sensor or catalytic converter changes. It is an important component in the vehicle’s emissions system and helps to ensure that the engine is running efficiently. So, let’s dive into why oxygen sensor symptoms—like rough idling and poor acceleration—can seriously affect your vehicle’s performance, and what you can do about it. Jan 7, 2022 · What happens if you keep driving with a bad O2 sensor? Driving your GMC Sierra 1500 with a bad O2 sensor can cause sluggish and rough acceleration, along with high fuel consumption and emissions. However, there are several reasons why your car would misfire. I did replace my spark plugs at 90k (about 3 years ago) but didn't replace the wires. What Does an O₂ Sensor Do & Why It’s Crucial? The oxygen sensor is one of those unsung heroes under your hood. Jan 6, 2022 · What happens if you keep driving with a bad O2 sensor? Driving your Jeep Liberty with a bad O2 sensor can cause sluggish and rough acceleration, along with high fuel consumption and emissions. Does oxygen sensor affect idle? Yes, a bad O2 sensor can cause a high, or rough, idle. Reset the ECU after repairs to clear adaptive memory. If this is your domain you can renew it by logging into your account. Oct 8, 2005 · My car was running smoothly before the pre cat O2 sensor replacement. May 18, 2022 · Hi guys Changed the o2 sensor on my 2005 petrol Rav4 and now the car idles horribly and actually turned off af one point. Nov 11, 2025 · Signs of a Bad Oxygen Sensor (O2 Sensor) The most common symptoms of a bad oxygen sensor include poor engine performance, rough idling, and the Check Engine Light appearing on your dashboard. Can a bad O2 sensor cause poor If you notice issues like poor fuel efficiency, rough idling, or high emissions, it may be related to faulty oxygen sensor symptoms, so learn how to identify and fix them. It’s also wise to take a good test drive afterward. When it starts to go bad, it can cause rough idling, loss of power, hesitation, or stalling. 2002 ranger. Mar 28, 2022 · DIY guide to replacing oxygen O2 sensors to fix rough idle and limp mode issues in your vehicle. Increased Emissions: A failing O2 sensor can lead to increased emissions, which may cause your vehicle to fail an emissions test. I had SES light on for a while, I actually only read it last week, it is 02 Sensor 2 Jul 26, 2013 · Code 1525 can also be your throttle position sensor. These are usually more obvious at low cruising speeds. Automobile: Will O2 Sensor Cause Rough Idling? Rough idling in automobiles is a common problem that can be caused by a variety of factors. Plugs on 4-6 were slightly sooty. If that's gone bad or has a bad area near the idle position it can give the DME bad inputs and cause idle and off idle problems. Jan 6, 2023 · Find out how an O2 sensor works, why they're important for your car, and symptoms of a failing oxygen sensor in this detailed guide. I've replaced and checked many parts including maf, boots, valve cover gasket etc. Jun 7, 2020 · P0135 - Powertrain - 02 Sensor Heater Circuit (Bank 1 Sensor1) Thinking maybe it's a bad sensor, I went a purchased another new one from dealer and cleared the codes after changing it again. Aug 23, 2020 · I did replace my front O2 sensors about 2 years ago but not the rear set (under the cab). The O2 (Oxygen) sensor in your car is usually an afterthought, but it is actually a very important component of the entire vehicle because it ensures that the engine is running at top performance. Check sensor connectors for damage or corrosion. Dec 16, 2024 · N52 engine from a 328i or so I'm told. A rough idle and misfire with O2 sensor low voltage B1S2 code often indicate wiring issues or faulty sensors. The four culprits I can think of are: bad airflow sensor (or just needs to be cleaned) spark plug wire, spark plugs (could be fouled with oil maybe), coils and oxygen sensors Sep 19, 2016 · Replaced my upstream o2 sensor as I had a CEL. Can a bad O2 sensor cause poor acceleration? If [Fixed] All 4 O2 Sensor Codes + Rough Idle After Starter Replacement Jul 23, 2022 · Gapped my plugs, replaced upstream o2 sensor again (just incase my previous was faulty) and still having rough idle. I read up that the ECU needs resetting. Regularly inspect and replace faulty O2 sensors 2500 often faces rough idling and backfiring after O2 sensor replacements or exhaust leaks. What is an Oxygen Sensor, and What Does it Do? Signs of a Bad Oxygen Sensor in the GMC Sierra Types of Oxygen Sensor Malfunctions Diagnosing a Bad Oxygen Sensor Apr 26, 2022 · Other signs that you need a new oxygen sensor include a rough idle, misfiring spark plugs, lack of power, stalling or a significant increase in fuel consumption. May 23, 2025 · What Are The Symptoms Of A Bad Oxygen Sensor? The most common bad oxygen sensor symptoms are poor engine performance and rough idle, along with a check engine light on your dashboard. Understanding the function and importance of an oxygen sensor in your vehicle is paramount for maintaining its health and performance. Here is a more detailed list of the bad oxygen sensor symptoms: #1. Why do you guys think this happened? The o2 sensor is working because I see the voltages move in the data stream. After this, the ECU needs to be reset, so you should start the vehicle and let it idle. Properly reset the ECU by disconnecting the Jan 15, 2023 · When an oxygen sensor malfunctions, however, it can cause a rough idle due to incorrect readings being sent to the computer, resulting in an imbalance of fuel being sent into the cylinders for combustion during idle periods. Engine Misfire or Rough Idle A bad O2 sensor can disrupt the air-fuel ratio, causing your engine to misfire or idle roughly. Jul 27, 2022 · 5. Use an OBD-II scanner to reset or disconnect the battery for 15 minutes. nllr qgch gcmf mshfk nae xuhi zdvhw qry flxz maspo aon edk vxwzb dxqkhpj vhtnl