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Coul you tell me if both sensors oxygen are the same or diferent thanks

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could you tell me if both sensor oxygen are the same or different my car is a mazda 626 1999,and has the code p0421

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what is the engine size of your car?

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Can you tell me what 1125 and 1418 codes are for a BMW? Thanks
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can you tell me where are the bank oxygen locations located
asked Mar 22, 2018 by podaddyexpress (102 points)

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