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1. Please tell me the location of oxygen sensor 1 and 2. It’s good if you let me know in the picture

2. Please advise on the OBD2 P0171 error code.
 

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P0171 has nothing to do with a failed or failing bank one (firewall bank) O2 sensor. Failing or failed sensors will set other codes. 99% of the time a 171 code (or 174 code for bank 2) is due to a vacuum leak. If you dont have an active 174 or pending 174 you likely have a vacuum leak that only effects bank 1. It doesnt take much of a vac leak to set 171 / 174 codes.
 
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