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 .
• 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, 00 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 deg. F (70 deg. 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 A/F Sensor B2 S1 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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot . 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.