P0133

DTC P0133: Primary HO2S (Sensor 1) Circuit 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 PCM.
2. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on.
3. Test-drive under following conditions.
- 55 mph (89 km/h) steady speed
- Transmission in D4 position
- 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).

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C104 (located at the right side of the engine compartment), the primary HO2S (Sensor 1) and the PCM.