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Where is leading sensor on bmw?

\015 THE OBD CODE READER GIVE ME 2 CODES. THE FIRS CODE IS 2850 WHICH IS THE LEADING SENSOR. SECOND CODE IS 2852 WHICH IS REF SENSOR. IS IT EASY TO REPLACE THEM?\015 Posted / edited by AnonymousUser on : 15-01-2018

Answers :

No code tells you to replace any sensor, it indicates a problem in the circuit or the signal. Do replace any sensors until a trained diagnostic tech has looked into this at the dealer.
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