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DTC P0133 Heated Oxygen Sensor 1 (Front) (Response Monitoring) — Component Inspection (CG10, CGA3)

EF & EC-7119flowchart

Applies to CG10 and CGA3 engines. Sensor handling — never re-use a sensor that has fallen >0.5 m onto hard surface. ECM pin 12 = HO2S1 front signal. 'HO2S1 MTR (B1)' (printed in step 2) appears to be the same monitor as 'HO2S1 MNTR (B1)' used elsewhere on the page — likely typo.

Component Inspection — HEATED OXYGEN SENSOR 1 (FRONT)

With CONSULT-II

  1. 1
    Start engine and warm it up to normal operating temperature.
    CONSULT-II DATA MONITOR screen for HO2S1: MONITOR with NO DTC; values for ENG SPEED (xxx rpm), MAS A/F SE-B1, COOLAN/TEMP/S, HO2S1 (B1) (xxx V), and HO2S1 MNTR (B1) reading LEAN.
    SEF646Y
  2. 2
    Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode, and select "HO2S1 MTR (B1)".
  3. 3
    Hold engine speed at 2,000 rpm under no load during the following steps.
  4. 4
    Touch "RECORD" on CONSULT-II screen.
  5. 5
    Check the following. • "HO2S1 MNTR (B1)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 3 times in 10 seconds. 3 times (cycles) are counted as shown below: R = "HO2S1 MNTR (B1)", "RICH"; L = "HO2S1 MNTR (B1)", "LEAN". • "HO2S1 (B1)" voltage goes above 0.6 V at least once. • "HO2S1 (B1)" voltage goes below 0.3 V at least once. • "HO2S1 (B1)" voltage never exceeds 1.08 V.
    Cycle-counting key showing R = HO2S1 MNTR RICH, L = HO2S1 MNTR LEAN, and example R-L-R-L-R-L-R-L-R pattern (1|2|3|4|5 cycles).
    SEF217YA

Without CONSULT-II

  1. 1
    Start engine and warm it up to normal operating temperature.
  2. 2
    Set voltmeter probes between ECM terminal 12 and ground.
    Without CONSULT-II — manual voltage probe at ECM terminal 12 and ground; voltmeter shown.
    SEF660Z
  3. 3
    Check the following with engine speed held at 2,000 rpm constant under no load.
    1. The voltage fluctuates between 0 to 0.3 V and 0.6 to 1.0 V more than three times within 10 seconds.
    2. 1 time: 0 - 0.3 V → 0.6 - 1.0 V → 0 - 0.3 V.
    3. 2 times: 0 - 0.3 V → 0.6 - 1.0 V → 0 - 0.3 V → 0.6 - 1.0 V → 0 - 0.3 V.
    4. The maximum voltage is over 0.6 V at least one time.
    5. The minimum voltage is below 0.3 V at least one time.
    6. The voltage never exceeds 1.08 V.
Code P0133
Heated Oxygen Sensor 1 (Front) — Response Monitoring
Diagnostic Procedure

Check HO2S1 waveform: must oscillate above 0.6 V and below 0.3 V at least once each cycle, three cycles in 10 s at 2000 rpm no load; voltage must never exceed 1.08 V. CONSULT-II path uses DATA MONITOR with HO2S1 MNTR; manual path uses voltmeter on ECM pin 12.

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