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1997 Ford Thunderbird Check engine light

Tiny
LLAVOTS
  • MEMBER
  • 1997 FORD THUNDERBIRD
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 110,000 MILES
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.
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Tuesday, June 1st, 2010 AT 6:36 PM

1 Reply

Tiny
MHPAUTOS
  • 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)
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Tuesday, June 1st, 2010 AT 7:29 PM

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