Question about 2003 Ford Focus

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Where is the O2 Sensor located on 2003 Ford Focus? Check Engine Light is on and trouble shooter device says the problem is in the O2 Sensor Heater Circuit, but where is it located.

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  • Anonymous Mar 28, 2014

    need o2 sensor heater control circuit location in vehicle

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  • Master
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The code will tell you which O2 sensor it is.
The code will point to either bank 1 sensor 1; bank 1 sensor 2; bank 2 sensor 1; bank 2 sensor 2.

From what I remember with a focus, it should only have 2 sensors, sensor 1 will be located before the cat, and sensor 2 will be located after the cat.

Posted on Oct 08, 2009

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  • Ford Master
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In the exhaust 1 before converter and another after. depending on code (bank 1 sensor1 with is frist sensor before cat and bank 1 sensor 2 which is after cat) good luck.

Posted on Oct 08, 2009

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  • Bic99 Dec 30, 2010

    Hi my ford focus Mk1 has is consuming loads of fuel and the diagnostics is saying that "Bank 1 Sensor 1 is present" but when I click on Bank 1 Sensor 2 the voltage is zero. Also, the "load" dial reads 48 -50%. Does this mean Sensor 2 post cat is faulty. The rev counter is hunting all the time and the fuel consumption is poor.

    Have changed

    1) sparks
    2) Air Flow Mass Meter
    3) IAC
    4) TPS
    5) Coil pack
    6) Air filter
    7) Oxygen sensor Pre cat {this reduced the load to 25%)

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