P2271

DTC P2271 O2 Sensor Signal Stuck Rich (Bank1/ Sensor2)

DESCRIPTION

In the catalytic process, CO, H2, and HC are oxidized to form CO2 and H2O, while the constituents of NOx are reduced to N2 and O2. A three-way catalytic converter and a closed-loop control system are essential elements in achieving adequate reductions in all three pollutants. The heated oxygen sensor on the back of the Catalytic Converter (warm-up catalytic converter) detects the aging of the converter.

Detecting Condition & Limp Home:

DTC DETECTING CONDITION

1. DTC Description
The ECM tests rear O2 sensor signal level during the time the lambda target point is being shifted to lean to determine rear O2 sensor signal stuck. The ECM sets DTC P2271 if rear O2 sensor signal is above the predetermined threshold while target lambda point is being shifted to the predetermined value. If the same error code is set in the next driving cycle, the ECM illuminates the MIL.

2. Conditions for Setting the DTC

Signal Wave Form:

Step 1 - 3:

Inspection Procedure