Hello TDI Club, I have a question about the exhaust of B4 Passat TDI. Please see the diagram I found in this post:
http://forums.tdiclub.com/showpost.php?p=1705407&postcount=7
Items number 5 and 6 in this diagram are an "L" shaped metal probe or sensor of some kind, that screw into a threaded port in the exhaust. There is one at the cat inlet, and one at the cat outlet. So it must be for measuring exhaust temperature? Or oxygen sensor? I don't know. I don't see any visible part numbers, and the two probes look identical.
Either way, I have two B4 cars. One has these sensors properly screwed into the exhaust, and the other has these two sensors coiled up and zip-tied under the car dangling loose, not attached to the exhaust. On the second car with the loose sensors, the exhaust does not even have the two ports to screw them into!
Can someone explain what the function of these are, and why one car would have them hanging loose with no where to screw them into?
FYI I do have a Ross Tech VCDS, which shows no error codes on either car, and both cars run great.
Thank you
http://forums.tdiclub.com/showpost.php?p=1705407&postcount=7
Items number 5 and 6 in this diagram are an "L" shaped metal probe or sensor of some kind, that screw into a threaded port in the exhaust. There is one at the cat inlet, and one at the cat outlet. So it must be for measuring exhaust temperature? Or oxygen sensor? I don't know. I don't see any visible part numbers, and the two probes look identical.
Either way, I have two B4 cars. One has these sensors properly screwed into the exhaust, and the other has these two sensors coiled up and zip-tied under the car dangling loose, not attached to the exhaust. On the second car with the loose sensors, the exhaust does not even have the two ports to screw them into!
Can someone explain what the function of these are, and why one car would have them hanging loose with no where to screw them into?
FYI I do have a Ross Tech VCDS, which shows no error codes on either car, and both cars run great.
Thank you