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Home >> Honda >> 2000 >> CR-V SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls - Self-Diagnostics - 3.2L & 3.5L) >> Diagnostic Trouble Code Identification >> DTC P0134: Heated Oxygen Sensor (Ho2S) No. 1 Bank 1/Insufficient Activity >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2000 Isuzu VehiCROSS, 2000 Isuzu Trooper, 2000 Isuzu Rodeo, 2000 Isuzu Amigo, and 2000 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC DIAGNOSTIC PROCEDURES article. Go to next step.
  2. Start engine and allow it to reach normal operating temperature. Apply parking brake and increase engine speed to greater than 1200 RPM for 2 minutes. Using scan tool, observe HO2S-1 Bank-1 parameter. If reading varies outside 400-500 mV range, turn engine off and go to next step. If reading does not vary outside 400-500 mV range, go to step  4.
  3. Turn ignition on. Review and record FAILURE RECORDS data on scan tool. Operate vehicle within FAILURE RECORDS conditions. If scan tool indicates DTC P0134 FAILED THIS IGNITION, go to next step. If scan tool display is not as specified, check for an intermittent problem. See DIAGNOSTIC AIDS .
  4. Inspect sensor harness for damage. Repair as necessary. If harness is okay, go to next step.
  5. Check for poor high and low signal circuit connections at HO2S-1 Bank-1 harness connector. Repair as necessary. Retest system. If connection is okay, go to next step.
  6. Check for poor HO2S-1 Bank-1 high and low signal circuit connections at PCM harness connectors. Repair as necessary. Retest system. If connections are okay, go to next step.
  7. Turn ignition off. Disconnect PCM connectors. Measure resistance of HO2S-1 Bank-1 high signal circuit between PCM and HO2S. If resistance is greater than 5 ohms, repair open circuit or poor connection. Retest system. If wire is okay, go to next step.
  8. Measure resistance of HO2S-1 Bank-1 low signal circuit between PCM and HO2S. If resistance is greater than 5 ohms, repair open or poor connection. Retest system. If wire is okay, reconnect PCM connectors and go to next step.
  9. Disconnect HO2S-1 Bank-1 connector. Turn ignition on. Using fused jumper wires, connect high and low signal circuits to ground. If scan tool display is 0-10 mV, replace HO2S-1 Bank-1. If display is not as specified, replace and reprogram PCM. See PROGRAMMING . Retest system.
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