What am I in for? 98 STS
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Cadillac Seville / Cadillac Eldorado Forum Discussion, What am I in for? 98 STS in Past Cadillac Vehicle Discussion; Hello, Lately my car has been running with the rpms between 3-4k. 3 trouble codes- B1341, p4020, c1738. Little Power, ...
  1. #1
    nnarsh is offline Cadillac Owners Member
    Automobile(s): 1998 STS
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    What am I in for? 98 STS

    Hello,

    Lately my car has been running with the rpms between 3-4k.

    3 trouble codes- B1341, p4020, c1738.

    Little Power, 158k miles.

    I am nursing her along, I will have money for repairs come tax return time.

    Is there anything I can do to get by until then?

    Thanks for reading.


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: What am I in for? 98 STS

    Codes are meaningless without their definitions.

    Might start with a good TB cleaning.

    "Little Power" might be a clogged CAT.

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a boombox
    Automobile(s): 2002.5 F55 STS - 66500 miles, 2014 Explorer XLT FWD
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    Re: What am I in for? 98 STS

    I'll bet that code is P 0420 - catalyst system low efficiency.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: What am I in for? 98 STS

    That does ring a bell. Got the same one on my daughters '04. However, that would not cause a high idle.

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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    There is no idle "reset", and no ISC motor/plunger on a '98.

  7. #6
    Mafiaman111 is offline Cadillac Owners Fanatic
    Automobile(s): 2001 Deville 135K
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    Re: What am I in for? 98 STS

    if there is no emissions in your state you could just punch out the honeycomb inside the converter as a temporary fix

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