Service Emission System 96 Eldorado
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Service Emission System 96 Eldorado in Past Cadillac Vehicle Discussion; I was returning home from a long trip (over 1,200 miles) and my SERVICE EMISSION SYSTEM light came on. My ...
  1. #1
    RoyalCaddy1's Avatar
    RoyalCaddy1 is offline Cadillac Owners Member
    Automobile(s): 1996 Cadillac Eldorado ETC
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    Service Emission System 96 Eldorado

    I was returning home from a long trip (over 1,200 miles) and my SERVICE EMISSION SYSTEM light came on. My exhaust has been loud since I bought the car 2 months ago, but this is the first time any emission message has come on. Does this usually mean the catalytic converter is bad?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Service Emission System 96 Eldorado

    Take a look at the sticky thread at the top of the main Seville page titled "How to pull codes". You want the link for OBD-I (OnBoard Diagnostics I) - it has an "obd1" in the URL. Learn to read your codes from the car's built-in system. You don't need a scanner. If the cat or O2 sensor system is bad there will be letter-number codes set which can be deciphered using the directions in the link.

  4. #3
    RoyalCaddy1's Avatar
    RoyalCaddy1 is offline Cadillac Owners Member
    Automobile(s): 1996 Cadillac Eldorado ETC
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    Bloomington, IL
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    Re: Service Emission System 96 Eldorado

    The only current code is PC0420 which is for low catalyst efficiency so I believe the cat converter may be bad. It also sounds like the loud noise in the exhaust is coming from that area.

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