Quickvr4

I have recently been getting the P0442 code, "Small leak detected". For those who have been through this process, what parts do you recommend I look in to replacing and in what order?

Thanks,
Derek

WaveyKat

gas cap, Fuel Neck .. you need to do a smoke test..

Quickvr4

New gas cap is in....will wait and see how it works out.

greekspec2

N80/EVAP valve next to ABS pump

Quickvr4

I can smell a gas leak when I park the car in the garage. Would the EVAP valve cause this or is it most likely the filler neck?

Dollos

Can someone please post a pic of the evap valve next to the esp module?
thanks

greekspec2

https://mbworld.org/forums/c-class-w...lve-issue.html

Here's a link with a pic, this part is very common on most european cars and we replace them at Audi alot, it basically controls/ allows fuel vapors to purge into the intake manifold vacum for combustion instead of into the atmosphere, and it's suppose to tick which is the diaphram opens in miliseconds to purge from canister when the ecu monitors it

Dollos

So this guy shouldnt tick. Mines been ticking since i bought the car. no codes are coming up.
what type of failure will this guy cause?
thanks

greekspec2

it should tick but the diaphragm/valve go bad allowing a small leak

Dollos

Ahh ok Thanks guys for the info