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.

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

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: My Chevy starts, switch gears, moved about 5 feet, started to make a clanking noise and would not move forward or reverse.

What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...

Q: How often should change my gas cap?

Hi, thanks for writing in. There is no real recommended replacement interval for gas caps. They are one of those "use it until it fails" parts. If you feel your gas cap may be going bad, then it may be...

Q: Sugar in the gas tank

The first thing that has to happen is the fuel tank has to come out of the car and be thoroughly cleaned. The fuel pump, which lives inside the tank will need to be replaced. Your car may have an...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...