Question about Chevrolet Malibu

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I'm having problems inspecting my car because it gives me a error code P0446. I was wondering if you can give solution because nobody really knows how to fix the problem, everybody tell me is something different and I don't know what else to do can u please guys help me??? o and they told me that it could be the heater oxygen sensor but I just wnat to make to sure.

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  • Edwin Apr 01, 2011

    you need to list the year, model and what engine your vehicle has for a more specific response


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Right off the bat have you tried a new gas cap? This code means you have a vacuum leak. In the evaporative system, in other words from the gas tank to the engine, part of the emissions system has to do with drawing fumes off the gas in the tank. This code will be real hard to give you a definitive solution for, due to - no info on, year, or model. As far as I know it is not related to the Ox2 sensor. If the car will run, you can try spraying WD 40 along all the small hoses and vacuum lines in the engine bay until you find the leak. Try up close to the air breather, intake manifold area. Hope this helps Fixya up.

Posted on Apr 01, 2011

  • don crutti Apr 02, 2011

    You'll find that the problem is in the EVAP solenoid located by the Charcoal filter cannister underneath the car in the rear by the gas tank. The charcoal cannister catches gas vapors when the solenoid is closed (car not started) and lets the vapors through (open) to the engine to burn up when the car is started at operating temperature. When the solenoid is bad it doesn't open/close properly and the sensor doesn't detect a pressure buildup in the Charcoal cannister. Fairly easy to replace, a couple bolts and vapor lines to disconnect. It's a common problem. If no presure is sensed, there is a outside possibility your gas gap isn't sealing the vapors into the cannister but instead allowing them to excape to the outside air through the gas filler tube. Solenoid is around $50 - $80.


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