Question about 2004 Volvo S40

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Need insructions on how to replace 02 sensors on a 2004 Volvo S40.

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  • larrylynnjr Oct 02, 2009

    Thank you for replying so quickly.

    I was told there was only two on this model.

    The check engine light came on and Advanced Auto hooked up a device under the dash and said the code was "P0133" for the front 02 Sensor.

    I called the dealer and their service department said I should replace both.

  • larrylynnjr Oct 02, 2009

    Thank you for replying so quickly. I was told there was only two on this model.

    The check engine light came on and Advanced Auto hooked up a device under the dash and said the code was "P0133" for the front 02 Sensor.

    I called the dealer and their service department said I should replace both

  • larrylynnjr Oct 02, 2009

    Thank you for the 2nd reply. I appreciate it.

    Where can I get instructions on how to go about replacing them myself if it looks like thats what needs to be done?

  • yadayada
    yadayada May 11, 2010

    which ones there are 4 of them.



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1st lets look at the explanatioon of this code, it is not always the sensor at fault, the sensor can just be a symptom of another problem.

Causes A code P0133 may mean that one or more of the following has happened:

  • The oxygen sensor is faulty
  • The wiring to the sensor is broken / frayed
  • There is an exhaust leak
Possible Solutions The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the front Bank 1 oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
  • Check and fix any exhaust leaks
  • Check for wiring problems (shorted, frayed wires)
  • Check the frequency and amplitude of the oxygen sensor (advanced)
  • Check for a deteriorating / contaminated oxygen sensor, replace if necessary
  • Check for inlet air leaks
  • Check the MAF sensor for proper operation

Posted on Oct 02, 2009

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  • yadayada
    yadayada Oct 02, 2009

    in the exhaust pipes that go to the catalytic converter is where the 2 sensors are you need to replace, note these are the sensors just off the engione, not after the catalytic converters, you will need to get under the car to replace them, u will need to buy a special O2 sensor socket to remove them, if they seem to come out hard spray the base with WD 40. the socket is avil from any good auto parts store, about $12 USA


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2004 Volvo with under 60,000 miles may still be under emissions warranty. If the car is under 60K and less than 5 years old check with dealer to see if it is covered under emissions warranty. Depends on mileage and in service date.

Posted on Oct 17, 2009


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