DTC Troubleshooting: P2A00
DTC P2A00: A/F Sensor (Sensor 1) Circuit Range/Performance Problem
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P2A00 A/F Sensor (Sensor 1) Circuit Range/Performance Problem
   

1.
Problem verification:

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 (CVT in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?5.
Test-drive the vehicle under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
CVT in D, M/T in 4th or 5th
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 5 seconds or more

Signal
Current conditions
Values
Unit
ECT SENSOR 1
    
VEHICLE SPEED
    

?6.
Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P2A00 A/F Sensor (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 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.?