HI there
This code is for a lean correction condition for a rich condition. In simple terms, bank 2 is running rich, the computer is spending to much time adjusting the condition to make it lean. This can be the result of several things. Here is a list of the possible causes for the code.
P1151 MAZDA - HO2S-21 Lean Condition Correcting For Over Rich Condition Read more: https://www.autocodes.com/p1151_mazda.html
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