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oxygen sensors

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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?
The feeling of driving down the interstate or a desolate country road with your foot on the pedal as you feel the smooth way your car handles is incomparable. There’s just nothing quite like...
How Your ECU Uses Sensor Data
When you get upset with your car and start to think it has a mind of its own, you’re not too far off from the truth. The engine control unit (ECU) is responsible for a...
How Long Have Cars Been Using Sensors?
A Check Oil light comes on and you know you need to add a quart. You back up and hear that familiar beeping noise letting you know you’re close to the car behind...
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?
Sensors play an integral role in the performance of your car’s engine. When one sensor stops working, it can cause the entire system to malfunction. The diagnostic computer relies on the information provided...
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
Oxygen sensor issue - 3.8LT V6 P0151 voltage low bank 2 sensor 1 2004 Holden Commodore
Hello - the P0151 code, as you have noted. Assuming the new O2 sensor is a good one, the problem could be faulty wiring to the sensor, an air leak in the intake, or a malfunctioning Mass Air Flow (MAF)...
Question
P0300 and P0305. Pending: P0304, P0306, P0171, P0174, P2196, P2198
Hi there. The issue that maybe happening is the are fuel injectors that are not firing and there is a vacuum leak on the engine. Possible multiple sensors are not working causing the P2196 and P2198 codes to appear. For...
Question
Lambda sensor
Without further testing you should not replace any part yet. You should have the pinpoint test done for the code to determine if the problem is in the sensors or there is another issue like a leak in the exhaust...
Question
Idle problem and shutting off.
The Oxygen Sensor is picking up an issue with the engine's rpm change through the fuel air mixture. If an Oxygen Sensor was to fail, the computer will make the Idle Air Control Valve constantly move to try and correct...
Question
How many oxygen sensors do I have on my 2008 Cadillac Escalade EXT?
Hi there - your Escalade has 4 oxygen sensors total, 1 before each of the two catalytic converters, and 1 after each catalytic converter. Diagnostic codes are usually pretty specific as to which one is malfunctioning (i.e. Bank 1, Sensor...
Question
Where r the 02 location atr they in front of the cat or back
There should be oxygen sensors located both in front of, and after, the catalytic converter. The control module will use the information from both positions to control the engines functions. If you need some help in locating/repairing the oxygen sensors,...
Question
Check engine
Both codes refer to the oxygen sensor that is to the rear of the catalytic converter. With regard to Code P0037, if the rear oxygen sensor is brand new, you should check the heater circuit ground (the oxygen sensor has...
Question
My car is not turning over.
Cars will start with no oxygen sensor installed or a sensor that is completely failed. AutoZone has no equipment whatsoever that can DIRECTLY test the operating condition of an oxygen sensor, let alone the training to interpret the waveform that...
Question
Help! P0138 came back after I put engine cleaner in my tank and have replaced the entire exhaust system from headers to muffler.
The code P0138 is on for two possible different situations. Either the oxygen sensor has shorted out on the exhaust system or the wiring from the battery to the sensor has a short or break in it. Check the oxygen...
Question
O2 sensors changed, but check engine light still showing code after clearing it I checked fuse. Wires are good and used Denso OE.
Depending on what the code was for will determine if the oxygen sensor was to be replaced. If the conditions were for a rich or lean mixture and it said oxygen sensor, then the spark plugs and wires could need...
Question
What is the best inexpensive o 2 sensor I can buy for a 2006 cayenne base?
The best thing to do is check with your local parts store or an online store for the best pricing on an oxygen sensor for your vehicle. If you need further assistance with replacing the oxygen sensors, then seek out...
Question
is 356.00 too much to get an oxygen sensor replaced on a 2004 ford f150
An oxygen sensor for your vehicle probably costs in the neighborhood of $60. There are four oxygen sensors on your vehicle. Labor time on each one varies, depending on location, but also depending on which engine you have. Per sensor,...
Question
What is the cost to replace an 02 sensor in a 2003 Hyundai Elantra
Hello, thank you for writing in. If you are going to have someone replace the oxygen sensor, you must take into consideration the price of the part and the cost of labor. For a technician from YourMechanic to replace the...
Question
i change my engine to a newer year do i have to chang sensor also
If you are using your old vehicle wiring harness, you can use your old oxygen sensors. However, note that the plug ends of the sensors used on the 2012 Travese are different than those used on the 2009 model year...
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...

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