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2000 Mercury Marquis check engine light is on!

Tiny
ZEVIKA
  • MEMBER
  • 2000 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
Check engine light came on and stayed on.

I checked the transmission fluid and it's O.K.

I don't know how to check the "O" sensor on my own.

I want to take into a shop but I don't want to be taken advantage on! I don't min paying for the repair as long as it's warranted.

any idea what could be the problem?

thanks for your help in advance
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Friday, January 29th, 2010 AT 12:33 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the computer scanned for code/s-you have a problem within the engine manangement system that caused the CEL to turn on-This is your starting point of diagnosis, finding out what's going on.
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Friday, January 29th, 2010 AT 12:43 AM
Tiny
HAWAII808
  • MEMBER
  • 6 POSTS
My name is alan. My car is 2005 mercury grand marquis 4.6liter g/s &gas engine "w". I just put my (cold air intake system in my car" but I don't known why (engine lite on). Please! Tell me why? Or I did wrong. May be reset the computer or what else! Please! Help me. Thank a lots!
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Wednesday, February 3rd, 2010 AT 1:16 AM

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