Question about 2004 Oldsmobile Alero
Posted by Anonymous on
The code P0442, "Small leak detected" means that the system is not sealed properly and has a small leak. The system prevents gasoline vapors inside the fuel tank from
escaping into the atmosphere. Most common cause for this code is when
the fuel tank cap is not sealing properly. Check the fuel tank cap, make
sure it's tight. If you think that it wasn't closed properly, the check
engine light should go off by itself in a few days of driving. If the
check engine light won't go off, there could be a number of other
reasons, such as leaking ventilation valve, cracked charcoal canister,
cracked or pinched hose, leaking seal, etc.
If the leak is very small, it could be very hard to find. Take your car to a dealer or well-equipped garage that can test your system with the special equipment.
Posted on Jan 04, 2011
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Posted on Jan 02, 2017
Although I recommend you buy a Haynes service manual for your Dodge, I think you will find the canister attached to the firewall or one of the fender wells.
Most of them look a lot like an overgrown spam can and it will have two connections on it.
Posted on Mar 06, 2009
hi. about half of the time the only real problem is that the sensor itself if faulty. have it put on a scanner, they do that for free at many auto parts stores like autozone
Posted on Aug 20, 2009
It is probably a sensor that goes by the gas tank. I belive it is called a Fuel Vent Sensor Circuit. That should fix the problem.
Posted on Dec 16, 2009
I would send the car in for a smoke test...So much easier to find the leak...
Posted on Mar 16, 2010
Testimonial: "found another definitation for a code 422. replaced rear o2,fixed"
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