Hi,

Just wondering if anyone has any clue as to the problem with Cel P0455 on an 98 Audi A4. Here is the diagnostic report from a code reader:

P0455
Evap Emission sys leak detected (gross leak / no flow)

misfire ok
fuel sys ok
comp component ok
cat mon inc
htd catalyst n/a
evap syst mon ok
sec air system n/a
a/c refrig mon n/a
oxygen sens mon inc
oxygen sens htr
egr system mon n/a

I also smell gasoline inside the cabin (definitely different from exhaust gasses). Also, when I get near empty and gas light comes on, after a car restart, gas level goes back to a little over empty and gas light turns off (a definite move in the needle, not just parking on inclines, etc.). Happened about twice before I decided to refuel.

I have checked as many vacuum hoses and had a roaming mechanic do the same and no hoses were leaking (but this wasn't a very complete check).

Any ideas? I dont feel like spending over a 100 bucks just to diagnose this at the dealership.

Thanks!

 

I forgot to mention I got the same problem when I lost my gas cap (however cel read large leak, now reads a little different). Replaced it with an aftermarket one and got the code above

 

The new gas cap may not seal properly.