R231 Mercedes SL350 P2201 Nox Sensor Fault

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paw777

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May 31, 2009
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Hello all - firstly thanks so much for your help in advance!

My engine management light on my 2014 SL350 keeps on coming on.

I've read the fault using a cheap meter, which is coming back as P2201 - NOx Sensor Circuit Range / Performance Bank 1. An independent Merc garage has also said that it's one or two of the NOx sensors at fault.

Mercedes direct are being really awkward and are saying that I need to take the car in for more diagnostics - at a cost of an additional £320. They also said that the cost would be £1200+ to replace both sensors, if they go ahead with the repair after running diagnostics.

Some questions:
  1. Does anybody have experience in fixing this fault?
  2. Would cleaning the sensors potentially work, or do I need a new sensor?
  3. Can I replace just one sensor, or would I need to do both?
  4. Where are the sensors located? Mercedes are telling me that the seats will have to come out.
  5. Has anybody had luck in having Mercedes sort this out, after the warranty period?

Thank you so much in advance!
 
Has anybody had luck in having Mercedes sort this out, after the warranty period?

you may have a chance if you have full Mercedes dealer service history

have you tried a Mercedes independent?
 

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