DTC Troubleshooting

DTC P2A00: Rear A/F Sensor (Bank 1, Sensor 1) Range/Performance Problem

DTC P2A03: Front A/F Sensor (Bank 2, Sensor 1) Range/Performance Problem

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- Information marked with an asterisk (*) applies to the front bank (Bank 2).

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158 °F(70 °C)
- Transmission in D position
- Vehicle speed at 30 mph(48 km/h) or more, and engine speed at 2,600 rpm or less
- Drive at an engine speed of 1,600 rpm. Accelerate to full open throttle for 5 seconds, then slow down with the throttle completely closed.

5. Monitor the OBD STATUS for DTC P2A00 and/or P2A03 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 6.

NO - If the screen indicates PASSED, 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. If it is EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.

6. Turn the ignition switch OFF.
7. Replace the A/F sensor (Sensor 1).
8. Turn the ignition switch ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure.
11. Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158 °F(70 °C)
- Transmission in D position
- Vehicle speed at 30 mph(48 km/h) or more, and engine speed at 2,600 rpm or less
- Drive at an engine speed of 1,600 rpm. Accelerate to full open throttle for 5 seconds, then 810w down with the throttle completely closed.

12. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2A00 and/or P2A03 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 13.

13. Monitor the OBD STATUS for DTC P2AOO and/or P2A03 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 12, 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 indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, Go to step 11.