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Code is for an A/R sensor fault. This sensor only comes on vehicles equipped to meet California emission standards. My vehicle is displaying this code even though is equipped to Federal standards only. I verified this by both the door label and the physical location of the B1S1 sensor. Have replaced the sensor and same code keeps coming back.

Vehicle: 1997 toyota camry LE 2.2

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P1311 Ignitor circuit malfunction

P1311 is for a ignitor malfunction , what you looking for is for P1133 this is for the A / F (airflow) sensor circuit response, there is a TSB about tis condition TSB # EG009 - 99 and EG004-01

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