P0133

DTC P0133: Primary HO(2)S (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.
- If DTC P1162 is stored at the same time as DTC P1163, troubleshoot DTC P1162 first, then recheck for DTC P1163.

1. Reset the ECM/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
- A/T in D4 position (M/T in 5th gear)
- Until readiness code or Temporary DTC P0133 and/or P1163 (F23A4 engine) comes on

4. Check for a Temporary DTC with the scan tool.

Is Temporary DTC P0133 and/or P1163 indicated?

YES - Replace the Primary HO(2)S (Sensor 1).

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C101 (located under the under-hood fuse/relay box), the Primary HO(2)S (Sensor 1) and the ECM/PCM.