Need advice trouble shooting codes
Need advice trouble shooting codes My T/A finally threw the SES light. The car sat for a few days and the SES light went off when I started the car. I drove it for two days and the SES light came back on.
Scanned the car last night. The codes were the ones for the front O2 sensors which I will replace tonight. Given that they are the orignal ones, I'm not surprised.
However, the other code was air in fuel tank. I've replaced the gas cap with a new locking one and still get that code. The seal on the new cap looks good. The seal on the old cap was bad.
What else can cause air the fuel tank?
Thank you.
Scanned the car last night. The codes were the ones for the front O2 sensors which I will replace tonight. Given that they are the orignal ones, I'm not surprised.
However, the other code was air in fuel tank. I've replaced the gas cap with a new locking one and still get that code. The seal on the new cap looks good. The seal on the old cap was bad.
What else can cause air the fuel tank?
Thank you.
What code did you pull, its too much hassle to go looking for the code, if you know it, post it.
There is a sensor on top of the sending unit that measures pressure in the tank. Check that, you have to take the tank down to physically check it or get a schematic and a meter and check the outputs to the PCM to see if they are still within specs.
There is a sensor on top of the sending unit that measures pressure in the tank. Check that, you have to take the tank down to physically check it or get a schematic and a meter and check the outputs to the PCM to see if they are still within specs.
TECH Senior Member
Joined: Dec 2001
Posts: 5,399
Likes: 3
From: Jacksonville, FL
If he was wrong on the EVAP code I wouldn't trust his diagnosis on the others either. If you're throwing codes for both precat sensors simultaneously it could be an indication of something else going on, for example running lean on both banks, and the 02s are fine.
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