## DTC Troubleshooting: P0133 (61-1)

DTC P0133(61-1): | Primary HO2S(Sensor 1) Slow Response

NOTE: If DTC P0131, P0132 and/or P0135 are stored at the same time as DTC P0133, troubleshoot those DTCs first, then recheck for DTC P0133.

1. | Reset the ECM/PCM.

2. | Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on.

3. | Test-drive under the following conditions: 89 km/h (55 mph) steady speed A/T in D position (M/T in 5th gear) Until readiness code or Temporary DTC P0133 comes on

4. | Check for a Temporary DTC with the scan tool. Is Temporary DTC P0133 indicated? YES - Replace the Primary HO2S (Sensor 1).n NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires, the Primary HO2S (Sensor 1) and the ECM/ PCM.n