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I have a 06 VW GTI 1.8T that I've been having some issues with as far as the P300 codes. All four continually pop up every week. I've changed the spark plugs, coil packs, and just got a oil change and changed the fuel filter. I just went to get my yearly inspection and failed for emissions. The mechanic said that the On-Board Diagnostic test came up that the "catalyst monitor," "Evaporative System Monitor," and "O2 Sensor Monitor" ass read as "not supported"

This is now the second mechanic I've brought it to and he said there was carbon build up so they flushed and clean it out. Took it home for the weekend and now the engine light is on again. Mechanic says he's stumped.

PLEASE guide me in some sort of direction.

Any information would be greatly appreciated.

Lauren
 
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