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N45 Lambda Error 2C55
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05-11-2018, 09:39 AM,
Post: #1
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N45 Lambda Error 2C55
Hi!
I recently have two 116i with N45 engine (ME9). Both had error 2C55 - O2 sensor ageing. In both cases we replaced O2 sensors with brand new NGK sensors (same as OEM) and this error comes again after 100km - 200km. There is no any other errors, engine runs fine. Anyone had this problem? If I have two same cases in similar cars I belive that this is pretty common problem 
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![[+]](https://cartechnology.co.uk/images/CarTechnologyTheCure/collapse_collapsed.png)
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05-11-2018, 13:12 PM,
Post: #2
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RE: N45 Lambda Error 2C55
What mileage? Most likely its CAT aging, not O2 sensor!
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05-11-2018, 13:25 PM,
Post: #3
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RE: N45 Lambda Error 2C55
One is 2006 176 410km and second is 2005 176 737km, almost identical cases
I've seen a lot of N42, N45, N46 with clogged cat but they threw different codes, mostly related to cat 
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06-11-2018, 06:24 AM,
Post: #4
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RE: N45 Lambda Error 2C55
What does ista suggest in the repair procedure? At that mileage I can bet it is inefficient CATs.
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08-11-2018, 20:59 PM,
Post: #5
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RE: N45 Lambda Error 2C55
I didn't checked what it suggest in test plan, don't ask me why. I just forgot
 I consider inefficient cats but I want to check few things before removing cats. I wanted to update DME but I couldn't - see attachment. Same in ISTA/P...
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