gregB Posted March 15, 2015 Share Posted March 15, 2015 Check engine light on. For a couple of weeks. Finally scanned code with VCDS and got: Mode 03: Emission related fault codesAddress E1: 1 Fault Found:P0141 - Oxygen (Lambda) Sensor B1 S2; Heating Circuit: Malfunction Which O2 sensor is it the upstream or down stream one? thanks Greg Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted March 15, 2015 Share Posted March 15, 2015 S2 = downstream sensor. Any work done to the car recently that might have required unplugging the rear sensor? Quote Link to comment Share on other sites More sharing options...
gregB Posted March 15, 2015 Author Share Posted March 15, 2015 (edited) No work, this an extra backup car the son used to drive. I started using it because my Passat's fuel pump died. But i will check the connector before I put the sensor. Edited March 15, 2015 by gregB Quote Link to comment Share on other sites More sharing options...
nipper Posted March 16, 2015 Share Posted March 16, 2015 The good news, on the downstream O2 sensor (after the cat) you can go generic. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted March 16, 2015 Share Posted March 16, 2015 I see. Definitely check the wiring first. It possible it has rubbed on the heat shield and chafed or cut one of the wires. Quote Link to comment Share on other sites More sharing options...
gregB Posted March 17, 2015 Author Share Posted March 17, 2015 Thanks guys. Got the fuel pump into the passat 4motion yesterday. Now assuming it stays drive Subby is next. Quote Link to comment Share on other sites More sharing options...
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