DTC P0133: General Description
The air/fuel ratio (A/F) sensor (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 A/F sensor (sensor 1) output voltage and uses fuel feedback control to improve exhaust emissions. The PCM compares the response characteristics and time against the A/F sensor (sensor 1) output. If the total A/F sensor (sensor 1) output is a specified value for a specified time, the PCM detects a deteriorated response a slow response, and stores a DTC.