pass smog

2003 MERCURY SABLE
180,000 MILES • 3.0L • 6 CYL • AUTOMATIC
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BADBOYBOSCO
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  • 1 POST
even tho my check engine lite IS NOT on... it wont pass smog... it had a faulty thermostat... replaced it and smog test comes back as INCOMPLETE... even after putting on over 600 miles since replacing thermostat... what can i do ???
Jan 19, 2016 at 7:34 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
change oil , oil and air fiters, drive about 20 miles on eway and see if that does it . normally it does unless something else is wrong. get it tested as soon as off eway if you can
Jan 19, 2016 at 7:42 AM
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JOHNNYT73
  • ✓ASE Certified Mechanic
  • 924 POSTS
  • ASE Certified Mechanic
Ok, have you checked your other components such as spark plugs, egr, air filter, and etc. Have you tried running any fuel system cleaners? You can still have the car scanned for history codes to see if there anything there.
Jan 19, 2016 at 7:42 AM
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