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Posted on Feb 06, 2011
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Hello i have a GTI its a 2.0L manual transmission, i have been having problem after problem thus far. Current engine codes PO422, PO300,PO304,PO303,PO302. I do not have a code list to see what these are and cant find one that is clear enough to understand, Not very smart when it comes to mechanics,But how could i go about fixing all these?

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jay kaye

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  • Posted on Feb 06, 2011
jay kaye
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I think that PO422 is the Cat Converter, it may be bad or may be just the O2 sensor.
The PO300, 302, 303, 304 code have to do with the ignition coils or wires. (302, 303, 304 means there are ignition /firing problems in cylinders 2, 3and 4). If your lucky just the wire and new spark plugs.
Google "engine codes Jetta" for more on web. Good luck.

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  • Posted on Sep 04, 2012
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I just had many of the same codes in my 99 jetta. the main problem was the po300, it was cause by cracks in the plug towers on the coil pack. i still have a residual po301, cylinder #1 misfire. most likely a fouled plug or wire. so check your plugs, wires, and coil pack.

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