Engine Control System

This MIL flashout code indicates one of the following problems

DTC P1149: Range/Performance Problem in Primary HO2S (Sensor 1) Circuit (F23A4 Engine)

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 HO2S (Sensor 2) P0141: Secondary HO2S (sensor 2) Heater
1. Do the ECM/PCM Reset Procedure.
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 kph) steady speed
- A/T in D4 position (M/T in 5th gear)
- Until readiness code or Temporary DTC P1149 (P1165) comes on
Is Temporary DTC P1149 (P1165) 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 C102 (located under the under-hood fuse/relay box). Primary HO2S relay, the Primary HO2S (Sensor 1) and the ECM/PCM.

DTC P1164: Range/Performance Problem in Primary HO2S (Sensor 1) Circuit (F23A4 Engine)
1. Do the ECM/PCM Reset Procedure.
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 in D3 position. Starting at 1,600 rpm, accelerate using wide open throttle for at least 5 seconds. Then decelerate for at least 5 seconds with the throttle completely closed until readiness code or Temporary DTC P1164 comes on
IS Temporary DTC P1164 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 C102 (located under the under-hood fuse/relay box), Primary HO2S relay, the Primary HO2S (Sensor 1) and the ECM/PCM.

DTC P1165: Range/Performance Problem in Primary HO2S (Sensor 1) Circuit (F23A4 Engine)

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 HO2S (Sensor 2) P0141: Secondary HO2S (sensor 2) Heater
1. Do the ECM/PCM Reset Procedure.
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 kph) steady speed
- A/T in D4 position (M/T in 5th gear)
- Until readiness code or Temporary DTC P1149 (P1165) comes on
Is Temporary DTC P1149 (P1165) 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 C102 (located under the under-hood fuse/relay box). Primary HO2S relay, the Primary HO2S (Sensor 1) and the ECM/PCM.

DTC P0133: Slow Response in Primary HO2S (Sensor 1) Circuit (F23A1/F23A5 engines only)

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. Do the ECM/PCM Reset Procedure.
2. Check for a Temporary DTC with the scan tool.
Is Temporary DTC P0133 and/or P1163 indicated?
YES-Replace the Primary HO2S (Sensor 1).
NO-Go to step 3.
3. Test-drive under following conditions.
- 55 mph (89 kph) 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
Is Temporary DTC P0133 and/or P1163 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 C101 (located under the under-hood fuse/relay box), the Primary HO2S (Sensor 1) and the ECM/PCM.

DTC P1163: Slow Response in Primary HO2S (Sensor 1) Circuit (F23A4 Engine)

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. Do the ECM/PCM Reset Procedure.
2. Check for a Temporary DTC with the scan tool.
Is Temporary DTC P0133 and/or P1163 indicated?
YES-Replace the Primary HO2S (Sensor 1).
NO-Go to step 3.
3. Test-drive under following conditions.
- 55 mph (89 kph) 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
Is Temporary DTC P0133 and/or P1163 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 C101 (located under the under-hood fuse/relay box), the Primary HO2S (Sensor 1) and the ECM/PCM.