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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
2c9d code and misfires on the cylinders 4, 5, and 6.
Hi there. The oil could have gotten on the spark plugs causing the plugs to not fire. Take out the spark plugs and see if they are covered in oil. If they are clean them off with carburetor cleaner and...
Question
Will the intake runner solenoid give a P0171 or and a P0174 trouble code? 2005 Ford F150
Hello - the short answer is "No". The P0171 and P0174 codes you mention are "lean condition" Bank 1 & 2 respectively. Intake runner solenoid issues are P200x codes. Your loss of power may be a result of a fuel...
Question
I went to a mechanic today after my check engine light came on! I think the code said either p1034 or p1035 are they same?
The two codes are not the same but do pertain to the same oxygen sensor in the exhaust one is for the signal and the other for the heater circuit not within specifications. Since the code was cleared then you...
Question
Intake manifold clip code on 1997 Ford F 150
Hello - the two codes you mention, P0157 and P0158 both refer to faults with the Oxygen Sensor after the catalytic converter on Bank 2. This would be the cylinder head and exhaust side that does NOT contain cylinder #1...
Question
The code I get for the O2 sensor reads Bank 2 is that the upper or lower sensor and where on the engine is that located? 2008 Kia Rondo
Hello - Bank 2 the cylinder group (or "Bank") that does NOT contain cylinder #1. (Conversely, Bank 1 is the group of cylinders or "bank" of the engine that contains cylinder #1) On your engine, Bank 2 would be the...
Question
Got a trouble code P0171.
The purpose of the No. 2 sensor is to monitor the efficiency of the catalytic converter. Consequently, if everything is functioning correctly, the No. 2 sensor is supposed to report a constant voltage. If the No. 2 sensor waveform mimicked...
Question
How do I fix O2 sensor heater cylinders 1-6 circuit malfunction?
The oxygen sensor heater is integral to the sensor assembly itself. It is not separately serviceable. If the heater tests bad, the entire sensor is replaced as an assembly. In your case, P1193 refers to an oxygen sensor which is...
Question
I have a new catalyic converter that I purchased
You are welcome to buy your own parts and book a certified mechanic from YourMechanic to install those parts or perform associated repairs. If you desire that your catalytic converter be replaced by a certified Mechanic, dispatched by YourMechanic right...
Question
I was told that on my 2006 Saab 97x w/5.3L engine that in order to change the upstream sensors the transmission has to be lowered.
The transmission could be lowered to make it easier to replace the O2 sensors, however, you do not need to lower the transmission to get the O2 sensor off. It would be best to remove the exhaust system and then...
Question
is it normal for an engine light that's been reset after service to come back on?
Any given diagnostic trouble code will typically have multiple faults listed as potential causes of "the" code setting. It is possible for one fault (in your case an oxygen sensor that might not be putting out the expected waveform) to...
Question
Check engine light is on for a O2 Sensor-high voltage
Hello. Usually a high-voltage O2 sensor check engine light code will be caused by a faulty O2 sensor itself. Though at times it can be caused by other issues such as shorted wiring, a leaking vacuum line, or even a...
Question
Car cutting off
I would not think an O2 sensor would cause a stall and no or hard restart. I would think you have a problem with a fuel pump or pump power supply problem. This could cause O2 sensor codes if vehicle...
Question
I would like to know how many O2 sensor in Toyota Caldina, model 2002 AT211 and auto transmission. 2002 Toyota Caldina
Hello - all of the third generation Caldinas (2002-2007) came with 4-cylinder engines, and should have 2 oxygen sensors. There will be one before the catalytic converter, and one after the catalytic converter in the exhaust system. For assistance, I...
Question
My suv wont accelerate at the time i press on the gas, hesitate, sluggish.
Hello. I'll be happy to help you with your vehicle. The oxygen sensor code may be related to the sluggish acceleration, in consideration that a bad catalytic converter could cause a check engine light for the oxygen sensor. A bad...
Question
O2 sensor replacement help needed.
The part that is covering the oxygen sensor is the heat shield on the exhaust manifold. You will have to remove the heat shield first to get the O2 sensor off. If you need further assistance with removing the heat...
Question
Had Oxygen sensor replaced twice by different shops. Still get this code intermitently.
Hello. A technician will have to diagnose your vehicle to see exactly which wiring is at fault. There are other things which can cause an oxygen sensor check engine light such as a vacuum leak or a bad catalytic converter....
Question
Why do I have a code for a slow O2 sensor and is that causing my stalling on my 2002 Saab 9-5
Hello. If your oxygen sensor is not functioning properly then that can cause the vehicle to stall and not run properly. I usually start by testing the O2 sensors first. It can also be caused by an air leak in...
Question
if the o2 sensor needs to be replaced. should you replace them all if none have ever been replaced at 114000 miles
Normally, if there is a question as to whether the sensors need to be replaced, checking the datastream with a diagnostic scanner will show how well the oxygen sensor is performing. A couple of things to note about oxygen sensors...
Question
Will a Oxygen senor keep your car from cranking
You could completely remove the oxygen sensor(s) from the vehicle and that would not prevent the engine from starting. However, if you have a bad coolant temperature sensor which prevents the ECM/PCM from adjusting the air fuel ratio at start-up,...
Question
Is it a blown head gasket?
Hello. If it leak shows up after 20 minutes of the vehicle running even after you put the k seal in you will still have to replace the radiator because the k seal isn't properly doing its job in fixing...

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