DTC P2A00, P2A03: Rear/Front A/F Sensor (Bank 1 & 2, Sensor 1) Range/Performance Problem
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- 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.
- Test-drive under these conditions:
- Engine coolant temperature above 158°F (70°C)
- A/T 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.
- 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, 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.
- Turn the ignition switch OFF.
- Replace A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT ).
- Turn the ignition switch ON (II).
- Reset the PCM with the HDS.
- Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
- Test-drive under these conditions:
- Engine coolant temperature above 158°F (70°C)
- A/T 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.
- 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 13.
- 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 10 and recheck.