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Discussion Starter · #1 ·
The above fault codes are being picked up on my 2017 F48 X1 25d suggesting the post Cat O2 sensor is faulty. Car runs perfect and no EML is on. If I clear the fault it comes back on startup. Anyone had similar issue? It was only picked up when I put my car in for stage 1 remap and the tuner found the faults and decided not to progress.
 
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