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I have an 2003 mazdaspeed with a check engine light.. did a scan and it said 02 sensor B1 S1.. what does b1 s1 mean?

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B1 means Bank one where the number 1 cylinder is S1 means the up stream sensor the one before the catalytic converter,or the first sensor. Hope this helps if not get back to me and we'll go from there. Please rate my fix as i strive to be the best, Thanks Ray

Posted on Jul 31, 2010

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