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DTC P0137 - SECONDARY HO2S-2 SENSOR LOW VOLTAGE Honda Prelude V

Testing & Diagnostics ~215 words
  1. Perform PCM reset procedure. See «TESTS W/CODES - INTRODUCTION»(ref-16345) article. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on. Using OBD-II scan tool, check HO2S-2 output voltage with engine speed at 3000 RPM. If voltage stays at 0.3 volt or less, go to next step. If voltage does not stay at 0.3 volt or less, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at HO2S-2 and PCM connectors. See «WIRING DIAGRAMS»(ref-16355) article. Repair as necessary.
  2. Turn ignition off. Disconnect HO2S-2, 4-pin connector. Start engine and allow it to idle. Using OBD-II scan tool, check HO2S-2 output voltage. If output voltage stays at 0.3 volt or less, go to next step. If output voltage does not stay at 0.3 volt or less, replace HO2S-2.
  3. Turn ignition off. Disconnect PCM 16-pin connector "D". Check for continuity between ground and HO2S-2 harness 4-pin connector terminal No. 2 (White/Red wire). If continuity exists, repair short in White/Red wire between PCM connector terminal D14 and HO2S harness connector. See «WIRING DIAGRAMS»(ref-16355) article. If continuity does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

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