Skip the auto shop - Our mechanics make house calls

Q: Check engine light on due to gas cap.

asked by on

Hello. I am having an issue with my check engine light. I went to Autozone to have a computer diagnositic check, and they said it was the gas cap. Bought a new gas cap, went off for a bit, then came back on. I went back, they told me to tighten it and drive and it would reset itself. I drove from NY to CT and back and it is still on. Not sure what to do and I have inspection coming up. What is the average price to fix something like this?

My car has 93000 miles.
My car has an automatic transmission.

A: You should have your fuel vapor control sys...

You should have your fuel vapor control system for leaks by a mechanic that can fill the system with smoke from a smoke machine that helps to locate the leak in the system. The purge control valve is the most common cause of a leak in the system next to the gas cap. After running these tests, the technician should be able to find what needs to be repaired and estimate the cost to fix it.

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Was cranking car and it just stopped. There is new battery. Lights horn are functioning, I get zero respsponse when turning key

Hi, thanks for writing in. You need to see if the starter has main battery power to the large terminal of the starter and then ignition power when the key is turned, getting to starter solenoid small terminal. If there...

Q: Large EVAC leak.

Hello. If the gas cap is verified to be good, the most common culprits are the purge valve and charcoal canister. If you would need help having this checked, a certified technician from YourMechanic can come to your car's location...

Q: fuses blow, check engine light on, compressor needs replacing

As far as the power window fuse, there is obviously a shorted circuit causing the fuse to pop every time. The components of the system must be inspected by an automotive electrical technician to track down the fault. The stalling...

Related articles

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...
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...
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.