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

asked by on October 30, 2016

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

I recently cleaned my battery terminals and when i connected everything back together my car just cranks and doesn't start any ide

Try to hold your throttle about 1/4 and see if it starts and then slowly return throttle to idle so computer will relearn idle again. If this does not help then you will need further diagnosis by a mechanic like...

Is it safe to drive when this warning light is on? Thanks.

The Advancetrac is the name for your traction control system that is used by Ford. The traction control system monitors the steering stability of the vehicle and engages when loss of traction has been detected. This is done by the...

Suspect immobilizer is keeping car from starting.

I would ask for help from a mechanic to perform some diagnostics on your car to see what is causing your car not to start. They will be able to determine if there is an immobilizer that is causing your...

Related articles

P2639 OBD-II Trouble Code: Torque Management Feedback Signal A Low
P2639 means a issue with one of the supporting control modules which may include transmission control module or fuel injection control module.
P0342 OBD-II Trouble Code: Camshaft Position Sensor Circuit Low Input
P0342 means that the camshaft position sensor circuit on engine bank 1 is sending a reading that is outside the manufacturer's settings.
A Buyer’s Guide to the 2012 Nissan Frontier
When When looking for a truck, the 2012 Nissan Frontier could be the vehicle you’ve been hunting for. It has a great look, a strong engine, and it is reliable. The vehicle has been making gains on other trucks in...