DTC P0133: Primary HO2S (Sensor 1) Slow Response Honda Pilot I

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.

1. Reset the PCM (see «HOW TO RESET THE PCM»(ref-173995-S09390407622005041500000) ).
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 the following conditions: 55 mph (89 km/h) steady speed Transmission in D position Until readiness code or Temporary DTC P0133 comes on
4. Check for a Temporary DTC with the scan tool or the HDS. Is Temporary DTC P0133 indicated? YES -Replace the primary HO2S (Sensor 1). NO -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the primary HO2S (Sensor 1) and at the PCM.

Scheme 97

1. Reset the PCM (see «HOW TO RESET THE PCM»(ref-173995-S09390407622005041500000) ).
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 secondary HO2S (Sensor 2) output voltage at 3,000 rpm with the scan tool or the HDS. Does the voltage stay at 0.3 V or less? YES -Go to step 4. NO -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and at the PCM.
4. Turn the ignition switch OFF.
5. Disconnect the secondary HO2S (Sensor 2) 4P connector.
6. Start the engine.
7. Check the secondary HO2S (Sensor 2) output voltage with the scan tool or the HDS. Does the voltage stay at 0.3 V or less? YES -Go to step 8. NO -Replace the secondary HO2S (Sensor 2).
8. Turn the ignition switch OFF.
9. Disconnect PCM connector A (32P).
10. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 2 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (A1) and the secondary HO2S (Sensor 2). NO -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If the symptom/indication goes away, replace the original PCM.

Scheme 98

Scheme 99

1. Reset the PCM (see «HOW TO RESET THE PCM»(ref-173995-S09390407622005041500000) ).
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 secondary HO2S (Sensor 2) output voltage at 3,000 rpm with the scan tool or the HDS. Does the voltage stay at 1.0 V or more? YES -Go to step 4. NO -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and at the PCM.
4. Turn the ignition switch OFF.
5. Disconnect the secondary HO2S (Sensor 2) 4P connector.
6. Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
7. Turn the ignition switch ON (II).
8. Check the secondary HO2S (Sensor 2) output voltage with the scan tool or the HDS. Is there 1.0 V or more? YES -Go to step 9. NO -Replace the secondary HO2S (Sensor 2).
9. Turn the ignition switch OFF.
10. Connect PCM connector terminals A1 and C18 with a jumper wire.
11. Turn the ignition switch ON (II).
12. Check the secondary HO2S (Sensor 2) output voltage with the scan tool or the HDS. Is there 1.0 V or more? YES -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If the symptom/indication goes away, replace the original PCM. NO -Repair open in the wire between the PCM (A1, C18) and the secondary HO2S (Sensor 2).