Skip the auto shop - Our mechanics make house calls

Q: My engine light keeps coming on. We have replaced the air/fuel ratio sensor four times.

asked by on

we have our air/fuel ratio sensor now replaced 4 times in 1 year( 1 at our charge) , clearned the code p2a00 in the computer, relearned it in the system but still the engine light keeps coming on. we went to different garages but they can't seem to find whats wrong. we had the air intake bellow boot replaced because of It was ripped. cleared the code again and now after 1 week the light comes on AGAIN. where can we look what might causes the sensor to go off every time?

My car has 148000 miles.
My car has an automatic transmission.

Hey there. As you may know, this may be caused by a few different things, one of which is a faulty sensor (which you have already replaced). This may also be caused by an intake air leak, leaking or dirty fuel injectors, or low fuel pressure. These types of problems will cause an unbalanced air/fuel mixture to be supplied to the engine resulting in poor performance, rough idling as well as causing the Check Engine Light to come on. Bring up this possibility with the previous garages or have a certified expert from YourMechanic diagnose the Check Engine Light in person so that this can be properly repaired.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • My engine light keeps coming on. We have replaced the air/fuel ratio sensor four times.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: check engine light

Anything is possible, however, it is not likely that the oxygen sensor shorted your computer. If your computer was damaged, your vehicle would not be drivable in most cases. You did not specify the code you read, so it makes...

Q: Tried to start the car, wouldn't turn over.

Has the battery been checked already? A weak battery may cause your symptoms where you try to start the engine and it sounds as if it would try but there just isn't enough juice. If the battery test fails or...

Q: My car struggles when put into gear.

Hi there. When you have problems with trying to shift the transmission into gear it is usually caused by a shift solenoid failure on CVT transmissions like your Altima has. However, it could also be a problem with internal transmission...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...