1997 Ford Thunderbird Check engine light

1997 FORD THUNDERBIRD
110,000 MILES • 6 CYL • FWD • AUTOMATIC
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LLAVOTS
  • MEMBER
  • 1 POST
My check engine light has come on. I had it scanned and codes P0171 and P0174 came up. What should I check to clear up these codes? Will it be expensive? I have a warranty with a $100 deductible that will soon run out. If I can fix it myself for less I will do that.
Jun 1, 2010 at 11:36 AM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
HI there,

These codes are indicating lean mixture on both banks, so i would start to look for a vacuum leak that is affecting both banks, somewhere in the main induction maybe, start here.

mark (mhpautos)
Jun 1, 2010 at 12:29 PM
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