Showing articles & questions for topic
oxygen sensors

Related articles

Symptoms of a Bad or Failing Oxygen Sensor
Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle.
How Long Does an Oxygen Sensor Last?
Today’s automotive exhaust systems are much more complex than they once were. They must be in order to comply with much stricter environmental controls and the requirement to create less pollution. Your...
How Are Sensors Used to Improve a Car’s Performance?
Modern vehicles utilize a series of car sensors to improve performance and reduce emissions. The oxygen sensor helps reduce tailpipe emissions.
How Your ECU Uses Sensor Data
Today’s modern vehicles are made up of anywhere from one to seven computers that assist with the car’s day to day functions. An engine control unit (ECU), is a computer that similar to that of...
How to Buy a Good Quality Oxygen Sensor
Oxygen sensors help your vehicle control both the fuel and ignition systems, making it a critical component to ensure your car is running and starting smoothly. Boost your ride’s fuel performance and...
How Long Does a Catalytic Converter Last?
The catalytic converter converts pollutants in the exhaust system into less toxic pollutants by using a redox reduction method. The catalytic converter is located on the exhaust system of your vehicle, and...
How to Replace an Oxygen Sensor
Oxygen sensors are one of the most important components on a modern vehicle’s engine management system. They are responsible for monitoring the air fuel mixture of the engine, and their readings affect...
How Do Sensors Get Dirty or Damaged?
Car sensors measure and relay vital information to the ECU. Some sensors can get dirty from normal use, or fail if the car overheats or has a problem.
P2197 OBD-II Trouble Code: O2 Sensor Signal Stuck Lean Bank 2 Sensor 1
P2197 code definition O2 Sensor Signal Stuck Lean Bank 2 Sensor 1 What the P2197 code means This code is usually an indicator of an O2 (oxygen) sensor problem, although...
P2274 OBD-II Trouble Code: O2 (Oxygen) Sensor Signal Stuck Lean Bank 1 Sensor 3
P2274 code definition O2 (Oxygen) Sensor Signal Stuck Lean Bank 1 Sensor 3 What the P2274 code means This code definition indicates that either the oxygen sensor has failed, there is...
How to Replace an Air Fuel Ratio Sensor
The air fuel ratio sensor fails within a vehicle if the check engine light comes on. Poor engine performance results from oxygen sensor failure.

Related questions

Question
How many O2 Sensors does 2009 Cadillac STS have?
Your car has 4 oxygen sensors in total. Two of the oxygen sensors are used to monitor the air fuel ratio in the six cylinders (one sensor for each bank of 3 cylinders). The other two oxygen sensors monitor the...
Question
I have the (2) upstream O2 sensors and need a price quote for labor to replace them only
You are welcome to supply your own parts and book a certified mechanic from YourMechanic to install those parts or perform associated repairs. To get an exact labor quote, please input your year, make, and model at YourMechanic's oxygen sensor...
Question
Hi Patrick, I was told by my machanic when my engine light sparked in that I need a oxegen sensor, and said that it has to be fixe
Oxygen sensors are tested using an automotive scope or oscilloscope. In your circumstance, if there are more than 100,000 miles on the sensor, the sensor output should be verified on a scope. The mechanic should show you the output waveform...
Question
do i need to replace both sensors
Only oxygen sensors that are DIRECTLY tested and fail need to be replaced. Please keep in mind that OBD trouble codes do not conclusively diagnose failed parts, nor could they. Consequently, the only way to condemn an oxygen sensor (or...
Question
rough idle
The downstream sensor is irrelevant insofar as the running condition of the engine. All the downstream sensor does is monitor and report the efficiency of the catalytic converter. The downstream sensor has no role in adjusting the air fuel ratio...
Question
2000 Toyota 4runner-both oxygen sensor replacement
If you input your year, make and model, as well as location (zip code) at YourMechanic's oxygen sensor replacement service page, the exact written quote you desire will be provided. Generally, after about 100,000 miles of use, it's not a...
Question
My check engine light is on , mechanic said it is catalyst converter however the car run perfectly fine , no misfire or more
In most cases, an inoperative converter will not affect engine performance at all. A catalytic converter is basically an after-burner to burn up any remaining fuel and air in the exhaust to improve tailpipe emissions. It does this through a...
Question
My engine light turns on, and i went to autozone to diagnosis, and it's faulty o2 sensor. Would you be able to replace it?
If code P0136 sets the only way you can determine if the oxygen sensor has failed is to use an automotive scope to graphically depict the sensor output waveform (it will look roughly like a sine wave) and switching rate...
Question
I am looking for an oxygen sensor for my 2004 Honda CRV
Hi there. Your vehicle has several oxygen sensors that are used for the engine to run properly. I would need to know what codes are coming up to know which one of the sensors it may be. I would usually...
Question
If your crank shaft oxygen sensor is out what does your car do?
The oxygen sensor is mounted in the exhaust system piping. The sensor is easily tested. If the sensor is defective, gas mileage will be somewhat reduced and the engine will not perform well. Oil in and around the spark plugs...
Question
Hello I have a 2004 toyota 4runner v8 4wd I just replaced the catelac converters but need to do the o2 sensors, I know there's the
Hello, thank you for writing in. The four oxygen sensors all serve an equally important role. Having two per bank (or side of the engine), the front oxygen sensor on each side gives a base reading to compare the reading...
Question
My check engine light came on. Took it to Autozone and they came up with this code PO156. What is that
Hello, thank you for writing in. A P0156 troubleshooting code stands for an error with the oxygen sensor. There are multiple sensors, and this one is behind (further towards the rear) the catalytic converter. Several things may be happening. First,...
Question
Will a oxygen sensor cause your transmission to stop pulling
A faulty oxygen sensor will cause the engine to run less efficiently (use more gas than usual) and may degrade engine performance to some extent. However, failure of the oxygen sensor itself can not cause the transmission to fail or...
Question
bad o2 sensors
Diagnostic Trouble Codes can never be used to "directly" condemn parts. In the case of an oxygen sensor, the oxygen sensor output must be evaluated on a scope to determine if the sensor itself is bad or if you perhaps...
Question
Engine light is on. Code is for a o2 sensor. Dealer can't find anything wrong. Your thoughts on the matter?
The underlying fault depends on which of over a hundred different oxygen sensor codes has set. Also, it depends on whether you are having trouble with a pre or post catalytic converter oxygen sensor (pre and post have different functions)....
Question
Is bank 2 sensor 1 upstream or downstream?
Anytime the code reader says sensor 1, it is referring to the upstream. Anytime the code reader says sensor 2, it is referring to the downstream. If you need further assistance with your oxygen sensors, then seek out a professional,...
Question
Please help 2006 Jeep Commander
Hello - the P0052 code is for a failing heater circuit on the oxygen sensor before the catalytic converter on cylinder Bank 2. The heater circuit allows the O2 sensor, which helps regulate fuel mixture, and thereby how well or...
Question
Can a bad o2 sensor cause my vehicle to jerk and jolt while driving?
It's "possible" but if the oxygen sensor(s) were bad enough to cause such symptoms, the check engine light would be on and there would be a diagnostic trouble code referencing an oxygen sensor or sensor circuit fault. In any event,...
Question
How long can I drive with bad 02 sensor? 1996 Audi A4
HI there - possibly. If it is one of the pre-catalytic converter oxygen sensors, yes, it is possible to damage the catalytic converters. From the problem codes, this would be a "Bank 1/2, Sensor 1" - the operative information that...
Question
I had O2 sensor replaced twice in 4 months, but the engine light came on again 2011 Audi A6.
Hi there. If the check engine light is still on for the oxygen sensors, look at the description of the code to see if the sensor relates to a lean or rich condition. If the code does not, then there...

Need a mechanic?

Our certified mobile mechanics make house calls in over 700 U.S. cities. Fast, free online quotes for your car repair.

Get a quote

Post a question and get free advice from our certified mechanics.


Ask a question