2016 BlueTec NOx sensor issue
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2016 BlueTec NOx sensor issue
2016 BlueTec 4MATIC E250, took delivery on Nov. 2015. Did DIY engine oil change on Nov. 2016 using Valvoline 5W-40 MST.
Had a first CEL with fault codes P229F, P2201 in Aug. 2017 at 6.4K miles. Took to dealer, replaced both NOx sensor under warranty. Last week, had the CEL with the same fault codes again, now at about 7.4K miles.
Plan to take to the dealer again later this week, but how can a replaced NOx sensor went bad in just 2 months/1K miles? I wonder if this sensor issue is masking some root problems. I don't want the dealer to just replace the sensors again and call it done. Any suggestion on what might be the root cause? What direction shall I point the dealers to fix the root cause?
Had a first CEL with fault codes P229F, P2201 in Aug. 2017 at 6.4K miles. Took to dealer, replaced both NOx sensor under warranty. Last week, had the CEL with the same fault codes again, now at about 7.4K miles.
Plan to take to the dealer again later this week, but how can a replaced NOx sensor went bad in just 2 months/1K miles? I wonder if this sensor issue is masking some root problems. I don't want the dealer to just replace the sensors again and call it done. Any suggestion on what might be the root cause? What direction shall I point the dealers to fix the root cause?
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Joined: Apr 2003
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From: Northeast
2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
2016 BlueTec 4MATIC E250, took delivery on Nov. 2015. Did DIY engine oil change on Nov. 2016 using Valvoline 5W-40 MST.
Had a first CEL with fault codes P229F, P2201 in Aug. 2017 at 6.4K miles. Took to dealer, replaced both NOx sensor under warranty. Last week, had the CEL with the same fault codes again, now at about 7.4K miles.
Plan to take to the dealer again later this week, but how can a replaced NOx sensor went bad in just 2 months/1K miles? I wonder if this sensor issue is masking some root problems. I don't want the dealer to just replace the sensors again and call it done. Any suggestion on what might be the root cause? What direction shall I point the dealers to fix the root cause?
Had a first CEL with fault codes P229F, P2201 in Aug. 2017 at 6.4K miles. Took to dealer, replaced both NOx sensor under warranty. Last week, had the CEL with the same fault codes again, now at about 7.4K miles.
Plan to take to the dealer again later this week, but how can a replaced NOx sensor went bad in just 2 months/1K miles? I wonder if this sensor issue is masking some root problems. I don't want the dealer to just replace the sensors again and call it done. Any suggestion on what might be the root cause? What direction shall I point the dealers to fix the root cause?
Thread Starter
Newbie
Joined: Jun 2015
Posts: 13
Likes: 0
E-class
MBWorld Fanatic!
Joined: Apr 2003
Posts: 1,036
Likes: 277
From: Northeast
2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
The good (and bad) news is that the quality is spotty. Sometimes you get a good one. Indirectly related, I put 200K miles on a 2014 diesel (not MB) and it's still on its original NOx sensors, so it's not entirely hopeless.
