DTC P2096, P2097 (19-21 9-Speed A/T)

DTC P2096  : Post Catalyst Fuel Trim System Too Lean (Bank 1)

DTC P2097  : Post Catalyst Fuel Trim System Too Rich (Bank 1)

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .
• If any of the DTCs listed below are stored at the same time as DTC P2096 and/or P2097, troubleshoot those DTCs first, then recheck for P2096 or P2097.

  P0130, P0133, P2195, P2A00: Rear A/F sensor (Bank 1, Sensor 1)

  P0134: Rear A/F sensor (Bank 1, Sensor 1) heater

  P0137, P0138, P0139, P2270, P2A01: Rear secondary HO2S (Bank 1, Sensor 2)

  P0141: Rear secondary HO2S (Bank 1, Sensor 2) heater

  P0171, P0172: Fuel system

  P0201, P0202, P0203: No. 1 - No. 3 cylinder Fuel injector (s)

  P0300: Random misfire

  P0301, P0302, P0303: No. 1 - No. 3 cylinder misfire

  P0351, P0352, P0353: No. 1 - No. 3 cylinder Ignition coil

  P219A: Rear bank cylinder A/F variation

DTC (PGM-FI)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Start the engine.

   - 5. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   - 6. Test-drive the vehicle under these conditions:

   • Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
   • Transmission in D
   • Engine speed below 4, 000 rpm
   • Vehicle speed between 15-75 mph (24-120 km/h) for 1 minute or more

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   ENGINE SPEED
   VEHICLE SPEED

   - 7. Monitor the OBD STATUS for DTC P2096 and/or P2097 with the HDS.

   DTC Description	OBD STATUS
   P2096 Post Catalyst Fuel Trim System Too Lean (Bank 1)
   P2097 Post Catalyst Fuel Trim System Too Rich (Bank 1)

   Does the HDS indicate FAILED?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rear A/F sensor (Sensor 1, Bank 1), rear secondary HO2S (Sensor 2, Bank 1), and the PCM.

   If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

   If the HDS indicates EXECUTING, keep the test conditions until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-6 and recheck.

2. Cylinder A/F variation check

   - 1. Start the engine.

   - 2. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   - 3. Check under these conditions:

   • A/C off
   • All electrical loads off

   - 4. Do the CYLINDER A/F TEST in the INSPECTION MENU three times with the HDS.

   CYLINDER A/F TEST

   Is the result OK?

   YES 

   Go to step 3.

   NO 

   Go to the troubleshooting for DTC P219A - Refer to: DTC P219A, P219B (19-21 9-Speed A/T) .

3. Exhaust system check

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Check for leakage, clogging, or blockage in the exhaust system.

   Is there leakage in the exhaust system between the rear A/F sensor (Bank 1, Sensor 1) and rear secondary HO2S (Bank 1, Sensor 2), or any clogging or restrictions in the exhaust system?

   YES 

   Repair or replace the exhaust system .

   NO 

   Go to step 4.

4. A/F sensor (Sensor 1) check

   - 1. Substitute a known-good rear A/F sensor (Bank 1, Sensor 1).

   - 2. Reconnect all connectors.

   - 3. Turn the vehicle to the ON mode.

   - 4. Reset the PCM with the HDS.

   Reset PCM

   - 5. Do the PCM idle learn procedure.

   - 6. Start the engine.

   - 7. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   - 8. Test-drive the vehicle under these conditions:

   • Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
   • Transmission in D
   • Engine speed below 4, 000 rpm
   • Vehicle speed between 15-75 mph (24-120 km/h) for 1 minute or more

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   ENGINE SPEED
   VEHICLE SPEED

   - 9. Monitor the OBD STATUS for DTC P2096 and/or P2097 with the HDS.

   DTC Description	OBD STATUS
   P2096 Post Catalyst Fuel Trim System Too Lean (Bank 1)
   P2097 Post Catalyst Fuel Trim System Too Rich (Bank 1)

   Does the HDS indicate PASSED?

   YES 

   Replace the original rear A/F sensor (Bank 1, Sensor 1) .

   NO 

   If the HDS indicates FAILED, replace rear secondary HO2S (Bank 1, Sensor 2) .

   If the HDS indicates EXECUTING, keep the test conditions until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 4-8 and recheck.