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Home >> Infiniti >> 2000 >> I30 Base, RE4F04W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0134 Or P0154: Front (Right & Left) Ho2S Sensor >> Procedure
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DTC P0134 Or P0154: Front (Right & Left) Ho2S Sensor: Procedure

  1. Loosen and retighten front HO2S to 30-37 ft. lbs. (40-50 N.m). Turn ignition off. Disconnect ECM harness connector. See Figure. Disconnect appropriate front HO2S harness connector. See Figure, Figure or Figure . Check continuity of White wire between ECM harness connector terminal No. 63 (right front HO2S) or No. 62 (left front HO2S) and HO2S harness connector. See Figure. Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  2. Inspect HO2S harness connector for water. Repair as necessary and retest system. If connector is okay, go to next step.
  3. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 63 (right front HO2S) or No. 62 (left front HO2S) by backprobing. See Figure. Increase engine speed to 2000 RPM. The following conditions should exist:
    • Voltage cycles from 0-0.3 volt to 0.6-1.0 volt more than 5 times within 10 seconds.
    • Maximum voltage is more than .6 volt at least once.
    • Minimum voltage is less than .3 volt at least once.
    • Voltage does not exceed one volt.

    If operation is as specified, go to next step. If operation is not as specified, replace appropriate HO2S and retest system.

  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
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