DTC P2195: A/F Sensor (Sensor 1) Signal Stuck Lean

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
If the vehicle was out of fuel and the engine stalled before this DTC was stored, refuel and clear the DTC with the HDS.
If DTC P2101, P2118, P2135, P2138, P2176, or a combination of P2122 and P2127, P2122, and P2138, or P2127 and P2138 is stored at the same time, troubleshoot them first, then recheck for DTC P2195.

Check for dirt or debris in the MAF sensor/IAT sensor.
Is it dirty?

YES: Remove the debris. If needed, replace the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT ).

NO: Go to step 2.
Check the installation of the A/F sensor (Sensor 1).
Is the A/F sensor loose or disconnected from the exhaust pipe?

YES: Go to step 7.

NO: Go to step 3.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2195 indicated?

YES: Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 14.

NO: Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
Turn the ignition switch to LOCK (0).
Reinstall the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do ECM/PCM IDLE LEARN PROCEDURE ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2195 indicated?

YES: Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 13.

NO: Go to step 13.
Monitor the OBD STATUS for DTC P2195 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?

YES : Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 12, go to the indicated DTC's troubleshooting.

NO : If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
Start the engine, and let it idle without load (A/Tin P or N, M/T in neutral) until the radiator fan comes on.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2195 indicated?

YES: Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 15. If the ECM/PCM was substituted, go to step 1.

NO: Go to step 17.
Monitor the OBD STATUS for DTC P2195 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?

YES: If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Pending or Confirmed DTCs were indicated in step 16, go to the indicated DTC's troubleshooting.

NO: If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 15. If the ECM/PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.