Hi,

I have a 2003 CR-V. For a month now, the check engine light would come on (I have noticed it usually appears at around a 1/4 tank to 2/3 tank of gas).. To reset it, I would unscrew the gas cap and screw it back on. Usually it would go off and if not, I would unscrew it again and rescrew it. The second time always worked.

So I thought perhaps the gas cap is faulty... I bought a new one. And within 5 minutes of driving the light went off. So I thought I fixed the problem. But now the light has come back again (with the new cap).

Does this give clues on what the real problem is? Is it gas cap/tank related or might it be something entirely unrelated.

I just don't understand why with replacing the cap, it goes out, then at half-tank it comes back on.