P1163

DTC P1163: A/F Sensor (Sensor 1) Slow Response

NOTE: 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.
2. Start the engine. Hold the engine at 3,000 rpm with no load (in neutral) until the radiator fan comes on.
3. Test-drive under the following conditions:
- 55 mph (89 km/h) steady speed
- Transmission in 5th gear
- Until the A/F sensor readiness code or Temporary DTC P1163 comes on

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

Is Temporary DTC P1163 indicated?

YES - Replace the A/F sensor (Sensor 1).

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and at the ECM.