1999 Cadillac Seville STS Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1999 Cadillac Seville STS

1999 Cadillac Seville STS Problems

Car Won't Start Because of Anti-Theft System That Uses Raised-Chip Key

Problems with anti-theft systems using the raised-chip key can prevent the car from starting. The wires in the steering column to the ignition lock cylinder tend to break. The key and ignition lock cylinder should be replaced to correct this condition.

High Pressure Power Steering Hose Can Leak Fluid

The high-pressure power steering lines are known to leak.

Excessive Engine Oil Consumption

Vehicles equipped with the 4.6L engine may develop excessive oil consumption. Please be advised that under optimum driving conditions, using one quart of oil every 2000 miles is acceptable. This Cadillac standard applies to vehicles with less that 50,000 miles. Our technicians tell us that if you experience excessive oil consumption it may be caused by built up on the piston rings which restricts movement, preventing them from wiping all the oil from the cylinder walls. Oil left behind is then burned during the combustion process. There is a special ring cleaning procedure which can help this situation. The GM service bulletin number is #02-06-01-009C.

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1999 Cadillac Seville STS Reviews

Purchased in 1999, original owner, I only drive it occasionally and have around 71k miles on it now. Only 1 major issue with the vehicle - a nagging vibration at 65mph caused by either axle or something in the suspension up front. Original tires, and replacement tires as well as rims have been high speed road force balanced twice but vibration continues. Replacing the axle will be next, somet...
my car has 251,000 miles and is still going strong--put used struts & windshield in it in the last 3 years--5000 rpm at least once a week for a couple minutes to keep that northstar from useing oil works--use a quart every 3k---don't drive a northstar like a grandma and it will treat you right!---love this car---
I own a 1999 Seville STS with 193k miles. The only issues on the interior are: Front passenger door lock switch will only un-lock, not lock. Front passenger window regulator failed, needs replaced. Brake light circuit open, switch needs alignment. Only mechanical problems are: Right rear air ride strut has air leak, causes compressor to run often. Does not affect driving performance...

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