2001 Volkswagen Passat Q&A
2001 Volkswagen Passat Question: My car has started to make a loud rattle noise at start & foul smell. Why?
The faster I go and then slow down, the louder the rattle noise will get. I have been told to stop driving the car, but no one has been able to tell me what should be replaced/ fixed. Here are the codes that I received from Pep Boys: P0430- catalyst bank 2, P0420- catalyst bank 1, P0300 Random miss, P0306, 6 miss P0305, 5 miss, P0154 O2 circuit, no activity B2s1, P0174 Bank2 too lean, P0304, 4 misfire, P0051 Heather control circuit low, B2s1---Also, they did not have the tools to check the timing belt and my Uncle (VW owner of 25 years)states that I should replace the timing belt, water pump, and thermostat-- before any mechanic has actually been able to look at the the timing belt. Any help would be AwEsOmE. - HED
This is an impressive list! I can tell you from what I see here the cluster of o2 sensor codes and random miss codes you probably do have a timing belt issue. One other option, the rattle noise plus smell can indicate a fouled or plugged catalytic converter. This will cause backpressure which can trip the o2sensors and lean codes and blow a hole in your resonator (flex-pipe) which will cause exhaust to come up through the floor and windows when open (your foul smell). Look into getting the timing belt and have catalytic checked. As for thermostat and water pump, if you are not having engine overheating issues I would say you can hold off on those for now till the other issues are resolved. - csubak30
Absouletly agree with other answer, but I would push towards the cat converter not functioning 1st then move into Timing belt concerns. The belt should definetly be changed no later than 100k. We just did a top engine job on a 01 VW Passat with 156k because the timing belt snapped causing bent valves. It can get pretty expensive when internal engine parts are damaged. We have a Timing Belt special going on this month 4 cyl $199.00 plus shop fees & Tax - Anthony2998