1998 Cadillac Seville engine computer (ecu)

The middle asking price for a used one is $119.90, across 21 live eBay listings for the 1996–2001 generation. Half of them ask between $110.00 and $134.99. That’s what sellers are asking, not what buyers paid. Sold prices aren’t published anywhere you can count on, and asking prices usually run about a quarter higher than what things sell for — so we say which one this is.

Checked on eBay on 22 October 2026.

How it comes off

  1. Find it: near the battery or the firewall, behind a kick panel, or under a seat.
  2. Release the connector locks and unplug it.
  3. Remove the nuts or bolts holding its bracket.
  4. Note the car’s VIN and the part number on the label. A buyer will ask for both.

The usual order on most cars. A 1998 Cadillac Seville may hide a screw or a clip somewhere else: if a piece will not move, look for what is still holding it before you pry harder.

What to bring for it

Typical sizes, not a promise for every car. Everything to bring to a pull-your-own yard.

Is it worth pulling?

That depends on what the yard charges for it and how long it takes to get off the car, and on where it sits against the other 84 parts on a 1998 Cadillac Seville that have a market. The full sheet for this vehicle ranks all of them by what you save and by what you clear.

Every car we price a used engine computer (ECU) on · What to bring