1990 Civic check engine light

Discussion in 'Civic' started by messplay, Mar 30, 2009.

  1. messplay

    messplay Guest

    My 1990 Civic 1.5 automatic turns on the check engine light
    occasionally under brisk acceleration after warm-up. Without turning
    car off, I look under pass side carpet for LED flashes. It flashes
    once every couple of seconds. Turn car off, back on CEL is out, LED
    still flashes only once. Car does not run any different with CEL on
    or off. Any ideas? Clyde
     
    messplay, Mar 30, 2009
    #1
  2. messplay

    Tegger Guest

    wrote in @r33g2000yqn.googlegroups.com:


    Code 1. Oxygen sensor needs to be replaced.
     
    Tegger, Mar 30, 2009
    #2
  3. messplay

    jim beam Guest

    on this gen vehicle, i've had code 1 triggered by coasting downhill on a
    cold engine, and by low coolant level [leaking radiator] messing with
    the engine temp readings. best check for those conditions first.
     
    jim beam, Mar 30, 2009
    #3
  4. messplay

    messplay Guest

    I am sorry, but I failed to mention in my text that the oxygen sensor
    had been replaced about a 1,000 miles ago. Thanks for the answer. I'm
    still not sure what else could be wrong. Clyde.
     
    messplay, Mar 30, 2009
    #4
  5. messplay

    jim beam Guest

    reset the ecu [see tegger.com for his faq's], then check as per my
    previous post.

    oem are the best sensors for this vehicle.
     
    jim beam, Mar 30, 2009
    #5
  6. messplay

    honda.lioness Guest

    Since it was replaced so recently, double check that the wiring from
    the sensor to the connector is fine.

    If this is not a Denso (= OEM manufacturer) sensor, then the
    aftermarket one you have may very well be the problem, as JBeam notes.
    A new Denso will run only about $30 through Amazon. Get the Denso part
    number from www.densoproducts.com.
     
    honda.lioness, Mar 30, 2009
    #6
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