DTC Troubleshooting: P2A00
DTC P2A00: A/F Sensor (Sensor 1) Circuit Range/Performance Problem
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

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

1.
Problem verification:

Problem verification
?1.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?4.
Test-drive under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
A/T in D, M/T in 5th or 6th
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
    
ENGINE SPEED
    

?5.
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
     
     
     
     
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 HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-3 and recheck.
Repair verification (OBD STATUS check):

?1.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.
Reset the PCM with the HDS.


?3.
Do the PCM idle learn procedure.

?4.
Test-drive under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
A/T in D, M/T in 5th or 6th
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
    
ENGINE SPEED
    

?5.
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 PASSED, FAILED, EXECUTING, or OUT OF CONDITION?

     
PASSED
     
     
     
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.?
     
FAILED
     
     
     
Go to step 1 and recheck.
     
EXECUTING
     
     
     
Keep driving until a result comes on.
     
OUT OF CONDITION
     
     
     
Meet the test condition, and check the OBD STATUS again.