2015 TDI - P2237 Fault O2 location?

The one on the right with the little insulation blanket. I replaced mine on a 2015 and the replacement part looked identical to the old one.

The sensor on the right is covered with a gray silicon tube with the black zip tie (witness that it has been replaced before). The sensor wires go inside of this…

Cut black zip tie. Roll back silicon tube, disconnect wire. Remove old O2 sensor. Ensure sensor safe anti seize lubricant is applied to threads ONLY. Remove any excess from sensor with solvent. Torque to specifications.

Thank you @a1979corvette Out of curiosity, what is the left one that also looks like an O2 sensor?

That is part of the NEW emissions standards for diesel engine! (The same standard that spawned the VW dieselgate scandal)

NOx (Nitrogen Oxide) sensor.
Nitrogen Oxide
Failure of this sensor would fall under code: p2201- NOx Sensor Circuit Range/ Performance Bank 1

@a1979corvette Thank you so much. You have been very helpful! I appreciate it.

a1979corvette said:

The sensor on the right is covered with a gray silicon tube with the black zip tie (witness that it has been replaced before). The sensor wires go inside of this…

Cut black zip tie. Roll back silicon tube, disconnect wire. Remove old O2 sensor. Ensure sensor safe anti seize lubricant is applied to threads ONLY. Remove any excess from sensor with solvent. Torque to specifications.

Click to expand...

A1979CORVETTE: Any chance you can post a photo (or 2 or 3) of the rear O2 sensor location? Thx.

I'll repost this question here: Any chance anyone can post a photo (or 2 or 3) of the rear O2 sensor location for my 2015 Jetta TDI? Cannot seem to locate it. Thx much.

I believe you are referring to the “down stream” o2 sensor?
While I can’t give you a photo, the sensor is located on the catalytic converter (middle of the tunnel), passenger side. The connector is under the passenger side long plastic rock guard.

VW part #:
1K0998262AE

I removed that same sensor, stuck it in a bowl of fuel injector cleaner, strapped it to an orbital sander and let it chooch for several hours. Hosed it out with carb clean, blew it off with shop air, installed it on the car and it's gone well over 10k miles now without issue. The cheapest I could find a replacement was $100 on ebay. Fuel injector cleaner was on sale for $2 at the autozone...I got in the zone and, for once, was satisfied with my purchase...

Next time try using a map gas torch.

a1979corvette said:

Next time try using a map gas torch.

Click to expand...

I’ll do that 👍🏻