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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • 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 came on

Multiple lights may be caused by multiple problems.Your BMW has a few dozen computers which can trigger warning lights to appear on your dash. Diagnosing multiple problems may be time extensive, but can be performed by a qualified technician with...

Q: Nasty glare coming from my side mirrors

The glare you are getting is not the outside mirrors causing it. The glare is coming from the dash and a/c vents reflecting the sun onto the inside of the glass of the door windows in certain sun angles. The...

Q: My car has trouble starting - 2001 Nissan Maxima

If you installed a "rebuilt" starter, among my first suspicions would be that the starter is no good. Basically, you want to first determine if the battery is in acceptable condition. To do that, perform a standard "load test." ...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.