Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P2195: A/F Sensor (Sensor 1) Signal Stuck Lean
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see 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 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 6.
NO -Go to step 2.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
- Check for Pending or Confirmed DTCs with the HDS.
Are any Pending or Confirmed DTCs indicated?
YES -If DTC P2195 is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1)and the PCM, then Go to step 13. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
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 PCM.
- 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 PCM with the HDS.
- Do the PCM idle learn procedure (see 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 PCM, then Go to step 1.
NO -Go to step 12.
- 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 11, go to the indicated DTC's troubleshooting.
NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then Go to step 1. If the screen indicated NOT COMPLETED, Go to step 10.
- Update the PCM if it does not have the latest software (see PCM Update ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
- Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
- 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 PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then Go to step 14. If the PCM was substituted, Go to step 1.
NO -Go to step 16.
- Monitor the OBD STATUS for DTC P2195 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).
NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then Go to step 15. If the PCM was substituted, Go to step 1. If the screen indicates NOT COMPLETED, Go to step 16.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.