P1149

DTC P1149: A/F Sensor (Sensor 1) Range/Performance Problem-'02-03 M/T models and CVT model

NOTE: If some of the DTCs listed below are stored at the same time as DTC P1149, troubleshoot those DTCs first, then troubleshoot DTC P1149.

P0137, P0138: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (sensor 2) Heater

1. Reset the ECM.
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. Check the Temporary DTC with the scan tool.
4. Test-drive under following conditions.
- 55 mph (89 km/h) steady speed
- A/T in D position (M/T in 5th gear)
- Until readiness code or Temporary DTC P1149 (P1165) comes on

Is Temporary DTC P1149 indicated?

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

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C102 (located under the right side of the dash), the A/F Sensor HO2S relay, the A/F Sensor (Sensor 1) and the ECM.