Service light

Tiny
OMAR.RUFFIN
  • MEMBER
  • 1985 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 178,990 MILES
Why does my service soon light comes on on my 1985 cadillac deville
Monday, August 22nd, 2011 AT 3:14 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The "check engine" light is an indicator for a system that monitors many electronic functions in the system, also called the "malfunction indicator lamp" (MIL). It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and can lead to further component or engine damage and some are emissions related not as serious but still a problem and need to be repaired.

Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will give you specific information about what the computer saw and will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone or Advanced auto parts in your area, they will read them for free. Once you have these code numbers, we can be a lot more specific about what your problem may be.

With yours, you can use the instructions below
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Monday, August 22nd, 2011 AT 3:38 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Push off and warmer buttons on the a/c panel. When you see all segments light release. Write the codes down. Then come back for help
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Monday, August 22nd, 2011 AT 8:21 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Yes, I just posted that.
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Monday, August 22nd, 2011 AT 8:48 PM

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