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mechanic replaced sensor 1 bank 1 sensor and the light and code p1273 still comes on

Vehicle: 2005nissan altima 2.5sl

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you will have to check fuel pressure, intake air leak or do a fuel injector flush
 
Possible Cause:
Air fuel ratio (A/F) sensor 1
Air fuel ratio (A/F) sensor heater 1
Fuel pressure
Fuel injector
Intake air leaks

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