Replacing the Front O2 Sensor On A VW Jetta

I’ve been driving a lot in Manhattan and the 5 boroughs lately and that is a mixture of very exited sprints where acceleration is key and lots of time just idling in traffic.  Unfortunately it’s mostly the latter.  So I’m sitting in traffic one day and I notice that the Check Engine Light comes on.  There are no noticeable changes in the cars behavior but the light is definitely on.  This will require more investigation!

So out comes my trusty Actron Auto Scanner Plus!

The code that I get is the P0130 stating that the Oxygen Sensor Circuit Bank 1 Sensor 1 is the problem.  This typically means that the sensor is malfunctioning and will need to be replaced.  However, my Actron can read the data coming from the car so I decided to take a look and it seems like the Oxygen sensor is functioning properly at the moment.  Hmmmm…..So I clear the code and see what happens.

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A couple of days later, the CEL comes on again and it’s a slightly different code.  It’s the P0135 for the Oxygen Sensor Heater Bank 1 Sensor 1.  Ok, I’m convinced; it’s the sensor that’s bad!

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So I purchase a Bosch O2 sensor for the VW Jetta 2.0T.

To replace it is pretty simple.  You will need to disconnect the connection to the harness that is located on the firewall of the vehicle.

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I slid the whole unit out of the holder and then disconnected the electronics.

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The actual Oxygen sensor is located on the exhaust side of the Turbo.  It’s a little hard to get to from the top so I actually went underneath the car to access it.  You will need a 7/8” wrench to be able to get the old sensor out.  I sprayed the sensor itself with some PB Blaster before attempting to loosen the sensor.  This was just a little insurance to make sure that the sensor did not break off in the bung.

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Fortunately my sensor came right out with no fuss at all.

Now it’s time to put the new one in.  The Bosch unit comes with a little anti-seize compound on the threads of the sensor but if the one that you purchase does not have the compound I recommend that you put a little bit on the threads for the next time that you need to replace it.

Make sure to keep the wire that goes to the electrical connector from tangling up in anything while you tighten the new sensor in the bung.  I used the same 7/8” wrench to tighten the sensor as I did to loosen it.  For the most part, I was able to hand tighten the sensor all the way till it was in there and I used the wrench to just finish it off.

Next you will need to route the new wire up to the electrical connector.  This should be pretty easy, just don’t forget to put the rubber stay into the little clip on the firewall.  Then you can connect to the connector and put it back into the holder.

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