Skip the auto shop - Our mechanics make house calls

Q: Changed gas cap........engine light still on. What else can I do?

asked by on

Car tested for engine light on.....said gas cap.....I changed the gas cap.....Engine light is still on. This happens a lot. I have to go for inspection this month.....this grandma is desperate to get this light to go off or I will fail inspection......can't afford a mechanic.

My car has 95000 miles.
My car has an automatic transmission.

There is no code for a gas cap on this vehicle. There is codes for leaks in the emission control fuel tank system. In order to find the reason of the code returning the vehicle emission vapor system needs to be smoke tested to see what is not holding the vapor in. The fuel tank or hoses and the purge valve may be leaking. Only a test will isolate the leak so it can be 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!

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: Car stalling out briefly at 70 MPH

Hello. If there is a problem with the variable valve timeing, VTEC, or with the oil pressure, then the vehicle will definitely act this way. The oil leak needs to be found first. It should not be hard since it...

Q: Would a wheel bearing be making my car sound like it's reving/ humming

The noise you are describing is very characteristic of a failed wheel bearing(s). Wheel bearing failures are surprisingly common but the part is, in fact, subjected to extreme forces even in normal driving. Sometimes just a big impact with a...

Q: Thumping noise after replacing motor mounts & tranny

Hello. The thumping noise that you hear is probably coming from one of the motor mounts that was replaced. The bolts that hold the mount down could be loose or it is possible that one of the mounts are defective....

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...