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You are watching: 2002 vw passat oxygen sensor location


On my 2003 V6 Passat, the "post" cat O2 sensors are located right top top the cats themselves, however near the entry of the cats ! How have the right to this it is in ????The only thing I deserve to think the is the these cats have several stages (compartments) that channel the exhaust back to the former of the cats, as opposed come going once through indigenous front come back.I recognize that some various other Passats have the post-cat sensors located on the downstream end, together you would certainly expect. Walk anyone know what the transaction is v this ? say thanks to you.
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Wow, thank you so lot Jay and PZ ! I never ever would have figured this the end without your explanations. Many thanks again.
Kind the related. I have actually a password p0143 which suggests a 1,3 sensor short voltage issue. If I just buy the sensor ($70 i found) is it a basic replacement? The photo makes that look easy enough, simply unplug and re-plug the brand-new one? and also these sensors space at the behind of the vehicle?
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Kind of related. I have a password p0143 which indicates a 1,3 sensor short voltage issue. If I just buy the sensor ($70 i found) is that a basic replacement? The photo makes that look simple enough, just unplug and re-plug the brand-new one? and these sensors are at the behind of the vehicle?
monitor the exhaust pipe, and also you will discover the O2 sensor, young jedi.you will require an O2 sensor socket to remove it. Expect it to withstand your efforts to extricate it.
follow the exhaust pipe, and you will discover the O2 sensor, young jedi.you will require an O2 sensor socket to eliminate it. Suppose it to resist your efforts to extricate it.

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Awesome, many thanks for the socket tip. What size o2 socket execute I need and do I have to reset the ECU by unplugging the battery or anything?
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The socket size is 7/8" (which is the same as 22mm metric). It may be feasible to usage an open-end wrench (or a "flare-nut" wrench). Yet as stated above, these sensors are hard to remove (because the sensors get set in over there real an excellent from the heat). Therefore you might want to invest a few $"s to acquire the appropriate tool. You can go to harborfreight.com and also do a search on "oxygen sensor" and also you will view two various types. One is a lengthy socket with a groove reduced in that (for the sensor wire to pass through) and the other kind is a "crow"s foot" offset type. You usage a 3/8" journey socket wrench or a 3/8" drive breaker bar through these. Since they space only about $5 each, I very recommend simply buying both due to the fact that one is much better than the other depending upon the accessibility you will have actually to acquire to the sensors. So for part sensors friend would usage the socket, and then for others you can want to usage the crow"s foot.