Advanced Diagnostics

Advanced Diagnostics - DTC P2195: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Signal Stuck Lean






General Description
When the rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is properly connected to the engine wire harness, but it is not installed in the exhaust pipe, the feedback is not done properly even if the rear A/F sensor is active after starting the engine. Thus, the exhaust emissions increase. When the rear A/F sensor output stays out of the normal range after the rear A/F sensor becomes active, the powertrain control module (PCM) detects that the rear A/F sensor is not properly installed and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
The rear A/F sensor (bank 1, sensor 1) output voltage is 3.37 V or more for at least 7.0 seconds.

Driving Pattern
Start the engine, and let it idle for at least 2 minutes.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.