Tensleep--96 models and later had an OBD-2 diagnostic system installed on them. The cabeling to the system was under the coin-holder, which sits right in front of the gear shift handle. Reach down and grab the coin holder if your car has one and give it a jerk . If it comes out and you see a computer looking connection, then your car has the OBD-2 diagnostic system on it. Cursed or blessed. If you buy a good diagnostic system that will read the codes, tell you what they mean, and even let you graph component parts that tend to fail so you can replace them before they fail, an OBD-2 system is a blessing, like the one Alex Pepper (ar?) sells for a hundred bucks that you load into your laptop PC and plug into the outlet under your coin holder. Invaluable. Cursed if you have only the one under the hood that tells you via a blinking light which code it is, and then a source to reference it so you know generally what is wrong. The only advantage to being cursed with the blinking light diagnostic system is that you can turn off the service light by disconnecting the battery for an hour or so. With the OBD-2 system you can't. But I think Alex Pepper's software now has that option. It didn't use to. Dick