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Home › Acura › 2003 › 3.2CL Base › Repair and Diagnosis › Engine Performance › System › Engine Performance System Self-Diagnostics › Diagnostic Tests › DTC P0139: Secondary Heated Oxygen Sensor Slow Response

DTC P0139: Secondary Heated Oxygen Sensor Slow Response

  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and run at 3000 RPM, with no load and transmission in Park or Neutral, until radiator fan comes on.
  2. Using scan tool, check Secondary Heated Oxygen Sensor (HO2S-2) output data while running engine at 3000 RPM. If voltage stays within 0.3 and 0.8 volt for 2 minutes, replace HO2S-2. If voltage does not stay within 0.3 and 0.8 volt for 2 minutes, problem is intermittent. System is okay at this time. Check for poor connection(s) or loose wire(s) between HO2S-2 harness connector, (on 3.2CL check connectors C102 near left side of engine compartment and C204 under right side of dash) and PCM connector. See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS.
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