Have a 2001 VW passat, getting heavy on diesel and occasionaly reving up by its self, heard something about a cooling temp. senser might be causing it, then some one else said not
It is a shot in the dark at this point. Your Passat, like mine, is a computer on wheels. Get yourself a VAG scan tool for $50. This will allow you to plug into your car's computer, under the steering wheel, and read its functions. It is easier than Windows for a PC...very user friendly. This will tell you of any issues, even the ones that do not set off the MIL(malfunctionIndicatorLight).
You could have a pre-CAT O2 sensor sening bad readings or a bad ignition coil/wires/or plugs etc...
I do not see how a coolant temp sensor would cause those symtoms, but if the scanner says that it is not getting a signal that it can use from that sensor, then it should be replaced. The computer is smarter than the mechanic, but it can take a mechanic to interpret the codes correctly which is why you post them here. Example, a reading from an O2 sensor may mean that the fuel/air mix is off due to a bad spark plug no burning it's fuel or a dirty air filter causing MAF sensor poblems, when the wrong solution would be to replace the O2 sensor.
VW will charge you over $100 per issue. They will give you the same answer the VAG scanner. You can get OEM VW parts on-line a lot cheaper than the dealer, too.
Mar 02, 2010 |
2001 Volkswagen Passat