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Home >> Suzuki >> 1999 >> Swift Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0131: Heated Oxygen Sensor (Ho2S) No. 1 Circuit Low Input Or DTC P0132: Heated Oxygen Sensor (Ho2S) No. 1 Circuit High Input
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DTC P0131: Heated Oxygen Sensor (Ho2S) No. 1 Circuit Low Input Or DTC P0132: Heated Oxygen Sensor (Ho2S) No. 1 Circuit High Input

NOTE: If any other DTCs besides DTC P0131 or P0132 are set, diagnose those DTCs first.
  1. Connect scan tool to Data Link Connector (DLC). Start engine and allow it to reach normal operating temperature. Increase engine speed to 2000 RPM for at least one minute. Allow engine to return to idle. Rapidly increase engine speed 5-6 times repeatedly while monitoring HO2S No. 1 parameter on scan tool. If display reading does not vary from less than 0.3 volt to greater than 0.6 volt, go to next step. If display reading varies from less than 0.3 volt to greater than 0.6 volt, check for an intermittent problem. Go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  2. On Esteem, check White and Orange wires between HO2S No. 1 and PCM for open or short circuit. On Swift, check Red and Light Green/Black wires for open or short circuit. Repair as necessary. If wires are okay, replace HO2S No. 1. Retest system.
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