DTC P2A00, P2A03

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

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

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .
• Information marked with an asterisk (*) applies to the front bank (Bank 2).

DTC (PGM-FI)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Start the engine.

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

   - 5. Test-drive under these conditions:

   • Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
   • Transmission in D
   • Vehicle speed between 25-55 mph (40-90 km/h) for 5 minutes
   • Drive at a steady speed between 55-75 mph (90-120 km/h) for 10 seconds, then decelerate (with throttle fully closed) for 8 seconds or more

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   ENGINE SPEED

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

   DTC Description	OBD Status
   P2A00 Rear A/F Sensor (Bank 1, Sensor 1) Circuit Range/Performance Problem
   P2A03 Front A/F Sensor (Bank 2, Sensor 1) Circuit Range/Performance Problem

   Does the HDS indicate FAILED?

   YES 

   The failure is duplicated. Replace the A/F sensor (Sensor 1) .

   NO 

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

   If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-4 and recheck.