P2A03

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

NOTE: 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 with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Check the AF FB AVE in the DATA LIST with the HDS.

Is the value 0.8 - 1.2?

YES - Go to step 5.

NO - Go to step 2 then recheck.

5. Test-drive under the following conditions.
- Engine coolant temperature more than 158 °F (70 °C)
- A/T in D position
- Vehicle speed at 30 mph (48 km/h) or more, and engine speed at 2,300 rpm or less
- Drive with the throttle fully opened for 5 seconds from an engine speed of 1,600 rpm, then decelerate with the throttle completely closed.

6. 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 7.

NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.

7. Turn the ignition switch OFF.
8. Replace the A/F sensor (Sensor 1).
9. Turn the ignition switch ON (II).
10. Reset the PCM with the HDS.
11. Do the PCM idle learn procedure.
12. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
13. Check the AF FB AVE in the DATA LIST with the HDS.

Is the value 0.8 - 1.2?

YES - Go to step 14.

NO - Go to step 12, then recheck.

14. Test-drive under the following conditions.
- Engine coolant temperature more than 158 °F (70 °C)
- A/T in D position
- Vehicle speed at 30 mph (48 km/h) or more, and engine speed at 2,300 rpm or less
- Drive with the throttle fully opened for 5 seconds from an engine speed of 1,600 rpm, then decelerate with the throttle completely closed.

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

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P2A00 and/or P2A03* is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Go to step 16.

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

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

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 12 and recheck.