Question about 1999 Mercury Sable

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Check engine light on, failed smog due to leak in tranny 98 sable

The fluid smell burnt and drives ok, but failed smog check due to traany leak of somekind, and they want 3400 to fix...what may be the problem has 120k

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  • josephscigli Oct 05, 2009

    replace speed sensor or something

  • yadayada
    yadayada May 11, 2010

    u give no useful info to help u.

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Your modulator valve on the outside rear of the tranny may be leaking tranny fluid into the vacuum line and it it is being burnt and exhausted by the engine. The valve has a thin diaphram within and over a period of time it can leak the fluid into the line. This must be replaced before it becomes a situation where the tranny will not shift out of low gear. Thank you, Dana

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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