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I have an intermittent (becoming more common) P2237 code. At VW dealer they sold me a O2 sensor with part number 04L-906-088-HT. Which of these two sensors in the picture does this replace? Neither look like an exact match for what I received from VW Parts. The firewall is to the left in the picture. Thank you for your help.
 

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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.
 

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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
 
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