Stock Problems/Issues Discussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.

P0420 BANK 1 O2 sensor

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Old 03-21-2010, 12:00 PM
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P0420 BANK 1 O2 sensor

P0420 BANK 1 O2 sensor that is the question?
Okay, who's gonna be the expert?
Is it the O2 sensor before the CAT or the one after?
 
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Old 03-21-2010, 12:26 PM
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Not an expert but can "google" :

http://www.hotrodlane.cc/New%20LS%20...TC%20P0420.htm

p420 is a generic (common to all cars) code -- so the basics of this explanation apply.
 
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Old 03-21-2010, 12:52 PM
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No, no, the answer is A or B, 50% chance of being right.Quick question here Ron, what did you ever do before google?
 
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