MY gas cap keeps turning on the check engine light 2003 with 210,000 miles I have replaced the cap sometimes if I put a little oil on the o ring will go for a few refills before throwing the light on again

 

Early AP1s (<2002) had an issue with the gas filler neck -- didn't know it applied to 2003s as well, but sounds like the case here:

If you're 100% sure the issue here is the gas cap (assuming you checked the CEL code), there's a trick -- when tightening the gas cap, hold the outer edge and tighten, don't use the middle handle. The outside edge should have immediate hard resistance, give it a few turns until it's tight.

Not worth the $100 repair for me.

 

I replaced the filler neck and cap on my 02. No more lights.

 

same thing with mine, got a new cap and only temporarily fixed it. now i need a new fuel filler neck

 

what is the updated part number for the fuel filler neck that wont cause a CEL and binding gas cap?

where on my filler neck can I check for the part number?

 

I believe all new fillers are updated; here's the TSB and part info:
http://www.crvownersclub.com/TSBs/2004/04-002.pdf

It's $86.38 from Majestic Honda. I just don't understand why the -- literally -- two extra seconds it takes to twist using the outer edge of the gas cap isn't enough for y'all. I've been using that trick for years now and it works, no CEL.

 

I am going to try putting the cap on just twisting the outside edge don't want to replace the filler neck

thanks for all the reply's

 

I just push down a bit to make sure it tightens all the way.

 

I'm a noob here and thought I'd jump in. I bought a 2001 S2000 w/26k miles and am having the same cel problem related to the gas cap. The previous owner let me know about it and said you have to let it warm up and cool down 3 times before it will shut off, and you have to tighten the cap before you start it. Sounds like I'm in need of a filler neck? I tried tightening the gas cap by holding the outside and no dice. Any other tips appreciated, thanks!