2004 Ford Focus

2004 FORD FOCUS
72,000 MILES • 4 CYL • 2WD • AUTOMATIC
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ACHELERAY
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  • 2 POSTS
I took my car in and they said it read the engine was running lean. what would need to be replaced?

and when drive on the freeway my car has random shakes.
Dec 10, 2008 at 3:20 PM
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RENAUDTN
  • CERTIFIED EXPERT
  • 636 POSTS
There are a few things that could make your car to run lean.
To be able to help you, get the trouble codes (autozone or o'reilly retrieve them for free) and reply back with them.
We'll start from there; without the codes we'd be shooting in the dark.
Dec 11, 2008 at 9:24 AM
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ACHELERAY
  • MEMBER
  • 2 POSTS
the code is 171
Dec 19, 2008 at 2:39 PM
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RENAUDTN
  • CERTIFIED EXPERT
  • 636 POSTS
Do the following:
-check your fuel pressure
-clean your MAF sensor
-check for vacuum leaks

Start with the MAF sensor: buy some MAF sensor cleaner (3 buck).
Remove the air duct, and spray some cleaner on the sensor. Let it soak for a few minutes, then spray some cleaner again. Don't touch the sensor; just spray it.
A lot of time, cleaning this sensor fixes this type of problem.

Hope this help
Dec 19, 2008 at 7:18 PM