Question about 2002 Volkswagen Passat
For P0420 and P0430 ,This means there is a issue with the catalytic converter and O2 sensor being no longer efficient. You are going to have to get them tested. Until then you will start seeing worse gas mileage and the car is going to not have as much power the longer you wait the worse it will be. You can get this done at any VW dealer. They have to hook up a scan tool and monitor the system. There are a few outcomes and its very costly to just start replacing parts. Its either bad wiring, O2 sensor is bad, Cat is bad, also could be a bad ECM the shop will be able to pinpoint the issue and know the exact item costing you less in the long run. Once you find out dont be obligated to spend full price there you can always have a local shop do it for less or do it yourself and order the parts online
For P0441, You won't notice a decrease in MPG, this system is the charcoal canister system that absorbes fuel vapor from the fuel tank so when you open the cap you don't vent fuel vapors into the atmosphere. The code is saying for some reason when the car triggers the valve that opens allowing these vapors to be drawn into the intake, it isn't seeing an increase in airflow. Most likely the purge valve has failed. It's a little valve with an electrical connector and two rubber hoses running to it on top of the air filter box. You can disconnect the hoses and check to see if there's charcoal contamination in the valve by tapping it on white paper.
Also you can check your vacuum lines to the valves on the back of the cylinder heads (they have the large plastic hoses running to them).
It is safe to turn off the code but the light will return. VWs don't throw phantom codes.
Let me know,if needed further assistance.
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Posted on May 14, 2010
Hi! Please check the spark plugs for carbon deposits for it may cause poor fuel burning thats why it stalls. I suspect the MAF (mass air flow) sensor too for it may be faulty. The MAF has big contribution on engine performance specially on the idling. Hope this helps and have a good one!
Posted on May 14, 2010
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Posted on Jan 02, 2017
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