1990 Pontiac Grand Prix engine light says check engine and

1990 PONTIAC GRAND PRIX
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SPENCER PILLMAN
  • MEMBER
  • 1 POST
Computer problem
1990 Pontiac Grand Prix 6 cyl Two Wheel Drive Automatic 195ooo miles

could these lights be defective or what could it be? the car runs very good so far i bought it just 2 weeks ago any advice would be appreciated thank you all...
Jun 14, 2010 at 8:06 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
your check engine light is on because you have a sensor that is ba.d. Your mileage is really bad because the car is running in what is called open loop. If you go to the site here for trouble code definitions it will tell you how to get them out and what they are. look under OBD1
Jun 17, 2010 at 1:39 PM
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