P0145

DTC P0145: Third HO2S (Sensor 3) Circuit Slow Response

1. Reset the ECM with the HDS.
2. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on.
3. Test-drive under these conditions:

- 55 - 65 mph (89 - 105 km/h) steady speed
- Transmission in 4th or 5th gear
- Until the readiness code or Temporary DTC P0145 and/or P0145 is set

4. Check for a Temporary DTCs or DTCs with the HDS.

Is Temporary DTC P0145 and/or P0145 indicated?

YES - Replace the secondary HO2S (Sensor 2), and the third HO2S (Sensor 3).

NO - Go to step 5.

5. Check the HO2S S3 at 3,000 rpm in the DATA LIST with the HDS.

Does the voltage stay within 0.3 - 0.6 V for 2 minutes?

YES - Replace the secondary HO2S (Sensor 2), and the third HO2S (Sensor 3).

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the third HO2S (Sensor 3) and the ECM.