Cthulhuy

Good evening. I hope everyone is having a good night. I wanted to post this thread in regards to the dreaded "Tighten Fuel Cap" error 07-08 TL-S's receive. I believe this affects the base models too, but since I drive a TL-S, it seems to apply to those years. After vigorously looking through the forums to fix the error, I ran across three threads that fixes this issue. This regards replacing the EVAP solenoid, and replacing the fuel filler pipe. However upon completion and test driving my vehicle for about 50 miles, the problem still persisted. After once again looking through the forums, I did not find anything else that could solve the problem, so I began to investigate. I didn't find any leaks, so I checked that possibility off my list. I then was thinking excessive vibration could cause the gas cap to come undone. Sure enough, both my of shocks in the rear were both damaged. (though not badly.) I never noticed because there was never a "clunking" sound or harsh ride quality when driving, but I assumed that excessive vibration could cause this. I bought new shocks and waited for them to come into the mail. 3 days later of waiting for the parts, I installed them, and properly shut my gas cap. It has now been about 150-175~ miles of driving without the error coming back on. If anyone has had the same headache of trying to stop this, this has helped me so far.

LoveMyTL-S

I get this error also. Recently had my shocks replaced and still getting the error...............seems to go away after turning off the engine and restarting. The error just pops up randomly.
Thanks for sharing............

Cthulhuy

I'm it sorry did not fix your issue. It has now been a little over 700 miles and I still have not had the error return.