1999 Pontiac Grand Am error P0442, EVAP code. Possible to l

MIKEWOJO22

MEMBER
1999 PONTIAC GRAND AM
6 CYL
FWD
AUTOMATIC
174,000 MILES

Well I got my car inspected last month at the beginning, figuring I'd not put it off. It failed miserably, like 6 OBDII codes.

I got rid of (permanently) all but one, P0442, which says theres a small leak in the evap system.

I changed the gasc ap, got all the monitors up and running, and still comes up.

How much would it cost to get this repaired at maximum, minimum, and average?

Being not a huge problem (enough for failure inspection in NYS), could I leave the EVAP monitor incomplete while others are not, and simply get it inspected that way for a passing vehicle?

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

If the gas cap didn't fix it, then it's possible there is a leak in one of the plastic evap tubes, or the canister purge solenoid is stuck open, thats on the canister. These systems are tested with a smoke machine that pumps smoke into the evap system, and where the smoke comes out, there is a hole. The solenoid is fairly cheap. It's located on the underside of the car near gas tank. The purge valve is in this picture, and is where the smoke gets pumped in.