My '01 GLS 2.0L Jetta failed inspection due to emissions. The diagnostic codes pointed to the bank 1 sensor 1 o2 sensor. I replaced my o2 sensor, then had the codes cleared. About 200 miles later my check engine light came back on.

The codes I am getting are P0130 (O2 sensor Circ., Bank1-Sensor1 Malfunction sporadic) and P1103 (O2 sensor Heater Circ.,Bank1-sensor1 performance too low sporadic). I have a friend at the VW dealership who sold me the sensor. He wasn't quite sure what to tell me. He is gonna check for software updates then get back to me I guess.

The Car runs fine. It had some "knocking" in the exhaust for a while until I replaced the o2 sensor. Now the knocking is minimal if at all. I really need to get his fixed so I can pass inspection. Does anybody have any ideas?

 

VW has a recall about O2 sensors and the sensing unit within the ECU hardware. The sensing unit it too strong, like senses EVERYTHING and will kick on the engine light with codes. The new software flash they have will, in a sense, "turn down the setting" so the ECU isn't kicking out the code all the time. I would do mine but then my GIAC software would be erased so I'm stuck with the light.