## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-70

DTC P0133: 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 (see page 11-4).
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).
NO | - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the primary HO2S (Sensor 1) and the ECM/PCM.