Emissions Code on 1996 STS
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Northstar Engines and System Technical Discussion Discussion, Emissions Code on 1996 STS in Cadillac Engine Technical Discussion; I am a new user of the forum and could use some help on an emission problem. My 96 STS ...
  1. #1
    bugger6543 is offline Cadillac Owners Member
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    Toledo, OH
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    Emissions Code on 1996 STS

    I am a new user of the forum and could use some help on an emission problem.
    My 96 STS shows the code of 1406. The check "emissions soon" will intermintently scroll across the console. I have recently replaced the plugs, fuel and air filters. The throttle body was also cleaned. Any suggestions what I should do next?

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  3. #2
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx), '04 DTS & the witch driver gone.
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    Re: Emissions Code on 1996 STS

    If that DTC is P1406, it translates to "P1406 - EGR Valve Pintle Position Circuit". Maybe the EGR valve connector is not seated properly?

    Otherwise, the EGR valve could be crudded up and sticking. The pintle can be cleaned with a solvent such as GUMOUT. Be sure to NOT allow the GUMOUT inside the electrical (top) part of the valve; it will eat up the insulation on the coil wiring (not good).

    Good luck.
    Jim

  4. #3
    hollisl is offline Cadillac Owners Member
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    Re: Emissions Code on 1996 STS

    Check out: http://caddyinfo.netgetgoing.com/how...vecleaning.htm. I did this on my '04, easy cleaning job.

    Quote Originally Posted by bugger6543
    I am a new user of the forum and could use some help on an emission problem.
    My 96 STS shows the code of 1406. The check "emissions soon" will intermintently scroll across the console. I have recently replaced the plugs, fuel and air filters. The throttle body was also cleaned. Any suggestions what I should do next?

  5. #4
    bugger6543 is offline Cadillac Owners Member
    Join Date
    Nov 2003
    Location
    Toledo, OH
    Posts
    6

    Re: Emissions Code on 1996 STS

    Thanks to both of the responses to my question. I did check the connections today but did not have time to clean the egr valve. I will let you know if that solves my problem.

  6. #5
    bugger6543 is offline Cadillac Owners Member
    Join Date
    Nov 2003
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    Toledo, OH
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    Re: Emissions Code on 1996 STS

    I did remove the egr valve and cleaned it. After the cleaning I installed a new gasket, cleared the codes, and hoped for the best. The car has been running well for two weeks with no trouble codes.

    Thanks for all the help.

    Bugger 6543

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