DTC P0133 (2019): General Description
The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) has a linear signal output in relation to the oxygen concentration. The powertrain control module (PCM) computes the air/fuel ratio from the rear A/F sensor (bank 1, sensor 1) output voltage and uses fuel feedback control to improve exhaust emissions. The PCM compares the response characteristics against the rear A/F sensor (bank 1, sensor 1) output. If the total rear A/F sensor (bank 1, sensor 1) output is a specified value for a specified time, the PCM detects a deteriorated response and stores a DTC.