P1149

DTC P1149: A/F Sensor (Sensor 1) Range/Performance Problem

DTC P1165: A/F Sensor (Sensor 1) Range/Performance Problem

NOTE: If some of the DTCs listed below are stored at the same time as DTC P1149 or P1165, troubleshoot those DTCs first, then troubleshoot DTC P1149 or P1165.

P0137, P0138: Secondary' HO(2)S (Sensor 2)
P0141: Secondary HO(2)S (sensor 2) Heater

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 the readiness code or Temporary DTC P1149 (P1165) comes on

Is Temporary DTC P 1149 (P1165) 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 C102 (located under the under-hood fuse/relay box), the primary HO(2)S relay, the primary HO(2)S (Sensor 1), and the ECM/PCM.

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