Trouble codes?
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HT4100 4.1, 4.5, 4.9 Discussion, Trouble codes? in Cadillac Engine Technical Discussion; Does anyone know what these trouble codes mean? EO46 IO39 IO52 ao48 NO SIR CODES ECM? This is how they ...
  1. #1
    kojak8 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Mar 2008
    Posts
    1

    Trouble codes?

    Does anyone know what these trouble codes mean?
    EO46
    IO39
    IO52
    ao48
    NO SIR CODES
    ECM?
    This is how they are displayed on the dash.
    This is for a 92 Eldorado with 4.9L
    Thank you

    Also what is the best way to change plugs? looks like the front ones are easy but what about rear? maybe from underneath?

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  3. #2
    TheeSlowPoke is offline Cadillac Owners Member
    Automobile(s): Cadillac 2000 DTS & 1999 Lexus LS400
    Join Date
    Oct 2006
    Location
    Minnesota
    Posts
    68

    Re: Trouble codes?

    Click on Search and do an Advanced Search.

    Put "How can I check for any codes Im throwing" in the titles search and put "RAMAIR57" in for the user name. That post has all of the codes you listed except EO46 defined.

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