Recent repairs include: power steering well replaced, alternator belt replaced, all cvs boots replaced, u joint replaced. weird thing is my check engine light has been on for years now and now that a problem arises it goes off and has stayed off so far, this puzzles me because the codes that were listed were repaired and it was reset by mechanic, but would come back on within several days. Any help in this matter would be appreciiated..thanks
SOURCE: 06' Ford Explorer engine light wont go off after repair
Yes, that sounds correct to be calibrated.and probably is what is causing your problem. Mass air flow sensors hardly ever go bad. They get dirty and set a code. Garages will try to sell you one when you can clean it with a throttle body cleaner. If you have your old one, clean it and put it back on, try it to see if it works better.
SOURCE: Code #P0171 & code #P0174
The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.
SOURCE: Code #P0171 & code #P0174
The intake manifold gaskets need replacement as well as the o-rings inside - if you call FORD they should be able to get you the correct parts.
SOURCE: check engine light reset for 2001 ford escape
On any car 1996 or newer after a repair is made the memory in the computer has to be cleared the light will not go away by itself. The proper way to clear this is with a scanner or code reader but if you dont have any other way unhooking the battery will force the computer to loose all its memory and start all over and the light will go away. If the light returns after a few days you still have a problim.
SOURCE: 1999 ford explorer 4.0
If it saying any of your bank are running lean (according to codes), try cleaning your EGR Valve or completly replacing it
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