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12
votes
2answers
223 views

Does waiting until the gas cap become faulty cause any damage?

The description for a fuel tank cap says: You can prevent unnecessary service costs by replacing the gas cap on modern vehicles before they go bad and the check engine light appears. Is this ...
3
votes
1answer
150 views

Cleaning the gas cap to rule out that tightness is the cause of the “check engine” light

The gas cap on my 2003 Pontiac Vibe used to make a slight sound of "pssstt..", the sound of some air either entering or exiting from the tank as I was opening the cap. Two months ago, the gas cap ...
1
vote
1answer
136 views

Check Engine Light for bad gas cap [duplicate]

I am just wondering... a friend told me that a faulty gas cap can cause air in the tank.. is that true? also, can that cause the check engine light to come on?
3
votes
2answers
819 views

Excessive vacuum making new fuel cap hard to remove

I recently had the gas cap changed (told there was a vacuum issue) at inspection. It is very difficult to remove this new cap when I go to fill up. Now the car is experiencing episodes where it does ...
2
votes
2answers
2k views

P0442: Faulty EVAP System

After seeing my CEL come on in my '05 Mazda 3 (just passed 100K mi.), I used my code reader to find out that the code was P0442. So I naturally came to this website to see what I could find on the ...
0
votes
3answers
250 views

GOLF 5 GTD gas error led

I have the gas error light (yellow) always on, It turns off some time but it turns on again. I have some cleaning of the air system but it did not work. What could be the problem ?
4
votes
2answers
6k views

VW Golf fuel filler cap will not unlock

The fuel filler flap on my 09 VW Golf estate (diesel) will not unlock. I have tried locking and unlocking the car which should relase the filler flap but it remains locked. The owner's manual says ...
12
votes
4answers
76k views

How important is a fuel cap?

I lost my fuel cap a couple months ago and haven't bothered finding a replacement. I haven't noticed any issues with it, but I'm wondering whether it's causing any damage or reducing gas mileage or ...
13
votes
2answers
11k views

Why would a new gas cap cause the “check engine” light to shut off?

This happened to a friend of mine: The "check engine" light came on in his truck (Toyota). He replaced the gas cap and the light shut off. Then I also had a "check engine" light come on in my 1994 ...