Crimsonnaire

iTrader: (1)

Can someone please tell me if cheap aftermarket gas caps such as those from Autozone lack a sufficient amount of quality to be able to release compression from the gas tank, causing the P0442/0440 (small emissions evap leak) codes?

Thanks.

EDS01SS

iTrader: (30)

Ive been using the locking gas cap that I bought from autozone for about 3 years now and have never had an issue with it.It is possible though that you just got a bad cap.If you still have your stock cap or could borrow one from somebody try that and see if the code still pops up.

87gnx

iTrader: (3)

You did look for the sealing ring on the new cap, right?? They have forgotten them before, and they'll never seal correctly. $.02

Crimsonnaire

iTrader: (1)

This is the cap I'm using now, but not the one I've been using for the past few months, which was from Autozone. This cap came with the car. Can anyone tell if it's OEM?

What physical indications from closing the cap would tell you that it has gone bad?