LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 1999 >> Vitara JS, 4D Utility, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0136: Heated Oxygen Sensor (Ho2S) No. 2 Circuit Malfunction
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0136: Heated Oxygen Sensor (Ho2S) No. 2 Circuit Malfunction

  1. Connect scan tool to Data Link Connector (DLC). Drive vehicle for at least 2 minutes at 35 MPH or greater. While revving engine, observe HO2S No. 2 parameter on scan tool display. If scan tool displays continuously varying voltage above and below .3 volts, go to step  4 . If voltage is not as specified, go to next step.
  2. Turn ignition off. Disconnect HO2S No. 2 harness connector. Start engine. Using DVOM, measure voltage between terminals No. 1 and 2 of HO2S No. 2 while revving engine. See Figure . If voltage is continuously varying above and below .3 volts, go to next step. If voltage is not as specified, replace HO2S No. 2 and retest system.
  3. Check circuits between terminals No. 1 (Gray/Yellow wire) and 2 (Red/Green wire) of HO2S No. 2 and PCM for an open or short to ground. Repair as necessary. If circuits are okay, replace PCM and retest system.
  4. Run engine at 2000 RPM for one minute, then return to idle. Note scan tool SHORT TERM FUEL TRIM value displayed. If value is between -20% to +20%, check for an intermittent problem. See TROUBLE SHOOTING - NO CODES article. If displayed value is as specified, go to DTC P0171: FUEL TRIM SYSTEM LEAN OR DTC P0172: FUEL TRIM SYSTEM RICH  .
scientia non olet · About LEMON Manuals