Question about 2000 Ford Focus

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Troubleshooting an error code from 2000 ford focus. code P0135

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  • Alexander Feht
    Alexander Feht Aug 05, 2010

    read this:

    Here is the diagnostic report for alex, for the vehicle "1FAFP3636YW1474xx"

    Date Created: 8/3/2010 1:44:06 PM

    VIN: 1FAFP3636YW1474xx

    Year: 2000

    Manufacturer: Ford

    Make: Ford

    Model: Focus

    Engine Type: L4, 2.0L; DOHC 16V

    Transmission: Automatic

    Trim Level: SE

    License Plate: BCCN-xxx

    Mileage: 89934

    === Stored Error Code(s) ===

    Error Code: P0135

    Possible Causes:

    Freeze Frame Information:

    1. DTC for which Freeze Frame was Stored - P0135.

    2. Fuel System 1 Status - Closed Loop.

    3. Fuel System 2 Status - Not Supported.

    4. Calculated LOAD Value - 59.61 %.

    5. Engine Coolant Temp - 208.40 °F.

    6. Short Term Fuel Trim - Bank 1 - -0.78 %.

    7. Long Term Fuel Trim - Bank 1 - 0.00 %.

    8. Engine RPM - 2,308.25 Rpm.

    9. Vehicle Speed Sensor - 33.55 Mph.

    Monitor Information:

    1. MIL - ON.

    2. Misfire Monitor - Complete.

    3. Fuel System Monitor - Complete.

    4. CCM Monitor - Complete.

    5. Catalyst Monitor - Complete.

    6. Heated Catalyst Monitor - Not Supported.

    7. EVAP Monitor - Complete.

    8. Secondary Air System Monitor - Not Supported.

    9. O2 Sensor Monitor - Complete.

    10. O2 Sensor Heater Monitor - Complete.

    11. EGR Monitor - Complete.

    12. NMHC Monitor - Not Supported.

    13. Nox Adsorber Monitor - Not Supported.

    14. Boost Pressure System Monitor - Not Supported.

    15. Exhaust Gas Sensor Monitor - Not Supported.

    16. PM Filter Monitor - Not Supported.

  • Alexander Feht
    Alexander Feht Aug 05, 2010

    I plan to do it myself. From what I have seen the possibilities are listed here:

  • Alexander Feht
    Alexander Feht Aug 05, 2010

    as for requirements: I am not meeting those right now:

    2. Fuel System 1 Status - Closed Loop.
    3. Fuel System 2 Status - Not Supported.
    4. Calculated LOAD Value - 59.61 %. <----- also not within value
    5. Engine Coolant Temp - 208.40 °F. <---- also not within value
    6. Short Term Fuel Trim - Bank 1 - -0.78 %. <---- not within
    required value
    7. Long Term Fuel Trim - Bank 1 - 0.00 %.
    8. Engine RPM - 2,308.25 Rpm. <---- over
    required value
    9. Vehicle Speed Sensor - 33.55 Mph.

    Short Term Fuel Trim (RTFT) is /- 30%
    ECT shows 150° F (65.5° C) and 240° F (115.5° C)
    IAT is less than 140° F (60° C)
    engine load is between 20 and 50%
    Vehicle speed between 30 mph and 65 mph
    Engine RPM between 1000 and 2200 rpm
    Minimum time of 10 seconds in Closed Loop operation



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P0133 - HO2S Sensor Circuit Slow Response (HO2S-11) The HEGO Monitor checks the HO2S Sensor frequency and amplitude. If during testing the frequency and amplitude were to fall below a calibrated limit, the test will fail. Contaminated HO2S sensor. This will cause the vehicle to fail emissions inspections, but is a fairly inexpensive repair.

Posted on Aug 05, 2010


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I have the check engine light on and the scan read P0135 error - what is this?

P0135 code is: Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

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The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.

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