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...
P2276 OBD-II Trouble Code: O2 Sensor Signal Stuck Lean Bank 2 Sensor 3
P2276 code definition The P2276 trouble code is having issues in bank 2 and sensor 3. What the P2276 code means This means that bank two of the engine block, the...
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.
P2209 OBD-II Trouble Code: NOx Sensor Heater Sense Circ Range/Perf Bank 1
P2209 trouble code definition The P2209 OBD-II trouble code registers when the Powertrain Control Module (PCM) detects an abnormal reading in the NOx (nitric oxide and nitrogen dioxide) sensor for the...
P2096 OBD-II Trouble Code: Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 trouble code definition In the simplest of terms, the P2096 fault code indicates the Powertrain Control Module (PCM) has received data from the oxygen sensors in the exhaust system that...
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...
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
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
emmissins test says i need oxygen sensor heater
Hello, thank you for writing in. The error message you got about the low threshold means the oxygen sensor has failed, the fuel system is off, or the catalytic converter is having issues. The amount of information available isn't enough...
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
Hi Tien I have a 2006 Dodge Durango. I was told the O2 sensor may need to be replaced. I was quoted about $700. Three something fo
The price will vary for location for parts and hourly labor rate but this price of $700 should include replacement of all 4 sensors. If you are not quoted to replace all 4 sensors then I would suggest getting second...
Question
I'm getting a po420 code is it possible it could be due to my rear catalytic converter even though there's no sensors after it? Or
You will have two O2 sensors on this engine. One will be before catalyst in manifold and one will be after or in the rear of the catalyst. If you do not have one then vehicle was modified in some...
Question
I'm getting a po420 code is it possible it could be due to my rear catalytic converter even though there's no sensors after it? Or
The sensor after the first catalyst is the one giving you code P0420 and should be replaced if the catalyst is good and you have no other codes in the system.
Question
Smog check failed due to Oxygen sensor
Hello, thank you for writing in. The first person to tell you this was correct to a certain extent. If the system is not warmed up, the readings cannot be taken accurately. However, if the engine is warmed up and...
Question
I need an upstream O2 sensor replaced, I am going to purchase the part, I just need to make sure it is the right one
Most if not all O2 sensors look very similar and may work different internally. Unless you are getting an O2 sensor from the manufacturer dealer for your exact application we would not be able to know if you get the...
Question
Can I replace 02 sensor myself
Hello, thank you for writing in. You can absolutely change the oxygen sensor in your Jeep. It is a very simply procedure of unplugging the sensor and unscrewing it. You will need a special socket to grip the sensor and...
Question
Where are the 02 sensors located on my 2010 Ford F-150 5.4L
This vehicle engine has 4 O2 sensors. They are all located in the exhaust system. There is one near each exhaust manifold and they are labeled HO2S1-1 and HO2S 2-1. Then there are two after the catalysts down further in...
Question
2010 Ford F150 I keep getting a code for oxygen sensor about once every 10 days. Does that mean it is on the verge of going bad?
A code to one of the 4 O2 sensors does not always mean the sensor is bad or going bad. It could be another problem with the fuel system or intake system causing the code. You did not give us...

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