where is the bank 1 sensor located?
You may want to try this before changing out sensor if you use the 87 octane gas all the time try using the 93 or 94 octane gas my check engine light came on saying oxygen sensor bank one replaced sensor and within 2 days light came back on saying bank one oxygen sensor to make along story short started using the 93 and 94 octane gas it took 10 tank fills and light coming on and going off 4 times but light has gone out and stays out.
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