Vacuum leak on 2002 S60

Discussion in 'Volvo S60' started by Richard Crewe, Sep 22, 2009.

  1. A few weeks ago, I got an "emissions system service required" message
    and warning light. Examining with an OBD-II reader, I can see a p1132
    trouble code. This is an O2 sensor not switching (stuck rich). With
    the
    same OBDII reader, I can see that the O2 sensor output does switch
    most
    of the time, so I don't think the problem is with the O2 sensor.

    What I think is happening is that there is a vacuum leak, that has
    caused the ECU to en-richen the mixture, then when the boost pressure
    rises, the leak causes air to leak out and the mixture to become too
    rich, triggering the fault.

    Does anyone know where these engines usually develop leaks on their
    inlet side, or has anyone else had this fault code and found it to be
    something else?
     
    Richard Crewe, Sep 22, 2009
    #1
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  2. Richard Crewe

    James Sweet Guest


    Normally a vacuum leak on a turbo car will make itself known with a
    hissing noise under boost. Is the output from the O2 sensor switching
    rapidly? Does this car have more than one O2 sensor? Many do.
     
    James Sweet, Sep 23, 2009
    #2
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  3. I haven't heard any excessive hissing, but the engine is fairly well
    sound proofed
    Although I can see the sensor switching, the OBD logging system has an
    update frequency of 1Hz, so I just see aliased data. The car does have
    two sensors, but the second does not appear to be visible through the
    OBD system. Do you think that the sensor might be getting "lazy" and
    not switching at the correct rate?
     
    Richard Crewe, Sep 23, 2009
    #3
  4. EGR valve stuck open ?
     
    Advanced Kitty, Sep 25, 2009
    #4
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