DTC P1149: A/F Sensor (Sensor 1) Range/Performance Problem, DTC P1165: A/F Sensor (Sensor 1) Range/Performance Problem Honda Civic VII

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. Reset the ECM/PCM (see «HOW TO RESET THE ECM/PCM»(ref-173106-S10389340332005031000000) ).
2. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on.
3. Test-drive under the following conditions: 55 mph (89 km/h) steady speed CVT in D position (M/T in 5th gear) Until the A/F monitor readiness code is set to complete or Temporary DTC P1149 (P1165) comes on
4. Check for a Temporary DTC with the HDS or a scan tool. Is Temporary DTC P1149 (P1165) indicated? YES - Replace the A/F sensor (Sensor 1) (see «Primary HO2S and A/F Sensor Replacement»(ref-173107-S03768689142005031000000) ). NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor relay, at the A/F sensor (Sensor 1) and at the ECM/PCM.

Scheme 110

Scheme 111

Scheme 112

Scheme 113

1. Reset the ECM/PCM (see «HOW TO RESET THE ECM/PCM»(ref-173106-S10389340332005031000000) ).
2. Start the engine. Is DTC P1157 indicated? YES - Go to step 3. 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/PCM.
3. Turn the ignition switch OFF.
4. Disconnect the A/F sensor (Sensor 1) 4P connector and ECM/PCM connector A (31P).
5. Connect A/F sensor (Sensor 1) 4P connector terminals No. 1 and No. 2 with a jumper wire.
6. Check for continuity between ECM/PCM connector terminals A6 and A16. Is there continuity? YES - Go to step 9 . NO - Go to step 7.
7. Connect A/F sensor (Sensor 1) 4P connector terminal No. 1 to body ground with a jumper wire.
8. Check for continuity between ECM/PCM connector terminals A6 and body ground. Is there continuity? YES - Repair open in the wire between the A/F sensor (Sensor 1) and the ECM/PCM (A16). NO - Repair open in the wire between the A/F sensor (Sensor 1) and the ECM/PCM (A6).
9. Substitute a known-good A/F sensor (Sensor 1) and recheck. Is DTC P1157 indicated? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck (see «HOW TO SUBSTITUTE OR REPLACE THE ECM/PCM»(ref-173106-S12924459732005031000000) ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. NO - Replace the A/F sensor (Sensor 1) (see «Primary HO2S and A/F Sensor Replacement»(ref-173107-S03768689142005031000000) ).