20 Most Recent 2014 Volkswagen GTI - Page 3 Questions & Answers

bottom of the engine

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water pump or thermostate

cv joint going bad, grease and boot may fix, probably caused by a cracked cv boot, and now the grease is gone, first thing to check is the boot on the cv joint (that's the shaft/joint that turns the wheels)attatches by a single nut in center of your front wheel (outer joint) if not the outer, then ck the inner (attatches to the transmission) (inner joint). most likely is the outer joint though

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.

HelloThe engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM

clean the negatif and positif cables from batterie.also on starter.

you are trying to go higher then the rev limiter its normal operation