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DTC P1167 (D16Y5 M/T): Primary Ho2S-1 Heater Circuit Malfunction

WARNING: This page is about a different car, the 2000 Honda Civic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DTCS in SELF-DIAGNOSTICS - INTRODUCTION article. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on. If DTC P1167 is indicated, go to next step. If DTC P1167 is not indicated, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at HO2S-1 and PCM connectors. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary.
  2. Turn ignition off. Disconnect HO2S-1, 8-pin connector. Turn ignition on. Measure voltage between ground and HO2S-1, 8-pin harness connector terminal No. 6 (White wire). See Figure. If 5.0 volts or less exists, go to next step. If more than 5.0 volts exists, replace HO2S-1.
  3. Using backprobe set, measure voltage between ground and PCM 31-pin connector "C" terminal No. 25 (White wire). See Figure. If more than 5.0 volts exists, check for open in White wire between PCM 31-pin connector "C" and HO2S-1. If 5.0 volts or less exists, substitute a known-good PCM and recheck. If symptom or problem goes away, replace original PCM.
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