if your car is a 1990 they have an external BARO sensor, it is located in the passenger side kick panel, it is a three plug sensor it is the ony one there. after 90 they made them internal as part of the ECU. So is your car a 90? I can help you out a little more after I get some more info. I had the same problem. took me a little while to find out what do. have you have www.g2ic.com very nice tech articles.