DTC Troubleshooting: P2A00 (61)

DTC P2A00:  A/F Sensor (Sensor 1) Range/Performance Problem

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Start the engine. Hold the engine speed at 3,000 rpm (min-1) without load (in Park or neutral) until the radiator fan comes on, then let it idle.

4.Test-drive under these conditions:
  • Engine coolant temperature more than 70 °C (158 °F)
  • A/T in D position (M/T in 3rd gear)
  • Drive first the vehicle between 40 km/h (25 mph) and 88 km/h (55 mph) for 5 minutes.
  • Drive at steady speed between 40 km/h (25 mph) and 88 km/h (55 mph) for 10 minutes, then slow down with the throttle complerely closed for 4 seconds.

5.Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?


YES - Go to 6.


NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose at the A/F sensor (Sensor 1) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to 3 and recheck.


6.Turn the ignition switch OFF.

7.Replace the A/F sensor (Sensor 1).

8.Turn the ignition switch ON (II).

9.Reset the ECM/PCM with the HDS.

10.Do the ECM/PCM idle learn procedure.

11.Test-drive under these conditions:
  • Engine coolant temperature more than 70 °C (158 °F)
  • A/T in D position (M/T in 3rd gear)
  • Drive first the vehicle between 40 km/h (25 mph) and 88 km/h (55 mph) for 5 minutes.
  • Drive at steady speed between 40 km/h (25 mph) and 88 km/h (55 mph) for 10 minutes, then slow down with the throttle complerely closed for 4 seconds.

12.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2A00 is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Go to 13.


13.Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?


YES - Troubleshooting is complete. n


NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to 1. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to 10 and recheck.