Service engine soon light

Tiny
DGUILLEN26
  • MEMBER
  • 1 POST
  • 2002 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 35,000 MILES
I recently changed the battery in my F 150. When I drove for about 20 miles, the check engine or emission warning light came on. I checked the manual it read that I was supposed to let it idle and drive it for 10 miles so the truck can relearn its idle trim. I also noticed a hesitation in the truck when idleing.
Is this warning light have to do with not changing the battery properly?
What can fix?
Is it normal?
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Wednesday, September 9th, 2020 AT 6:17 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
THe battery or alternator light will come on if there is a problem with charging. What I recommend doing is taking the vehicle to a nationally recognized parts store and have the scan the computer for codes. Let me know what you find.
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Wednesday, September 9th, 2020 AT 6:17 PM (Merged)
Tiny
MARYDARLINE
  • MEMBER
  • 10 POSTS
  • 2002 FORD F-150
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
Our 2002 F150 has a service engine soon light on. We had it scanned and came up with 2, PO171 and PO174. The problem is we don't know if the vechicle has 1 or 2 O2 sensors. Also when checking the pcv valve the is very little vacuum. Could this be the cause of the codes?
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Wednesday, September 9th, 2020 AT 6:17 PM (Merged)
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
You need to know exactly how much vac you have should be beyween 18 and 21 inches of vac if not suspect exhaust convertor or muffler. These could be false codes if it is running bad you will always have these codes. And you have atleast two 02 sensors
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Wednesday, September 9th, 2020 AT 6:17 PM (Merged)
Tiny
PHILIP THOMAS
  • MEMBER
  • 1 POST
  • 2002 FORD F-150
  • V8
  • 4WD
  • MANUAL
  • 78,000 MILES
The truck will run good for awhile then it will start missing the check engine light will flash then it will run good for a mile or two. It will come and go all the time.
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Wednesday, September 9th, 2020 AT 6:18 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
You need to check it for tune up as a 1st step the blinking check engine light indicating a misfire
you need to get the PCM scanned for codes
that will help pin point the troubled area or cylinder

get the codes
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Wednesday, September 9th, 2020 AT 6:18 PM (Merged)

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