SOURCE: 1999 volkswagen passat 2.8 v6 4d gls
you have to get special socket that made for o2 sensors you can get local part store and you have to know which sensor you have to replace.
SOURCE: 2000 Volkswagen Passat 4Motion 2001 passat v6
When were the sparkplugs,airfilter changed,is there damp in the coil packs or the seals worn allowing in damp.The maf sensor(mounted in airbox top) may be faulty or the throttle throat may need cleaning.Fuel contamination can play a part, how old is the fuel filter as they should be replaced every 2 years.Check that all vacuum pipes are secure and not cracked as leaks can add to the problem.
SOURCE: I have a 2004 V6 Volkswagen Passat with 110,000
Could be a lot of things. A sensor, bad gas, clogged fuel filter, spark plugs, plug wires, camshaft position sensor, etc.. Check engine light on?? If so, have the the code scanned to find out the fault code. Go to your mechanic, or local auto parts superstore...most do it for free banking on you will buy the part from them.
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