1984 buick regal limited service engine soon " where is the obd connector located

It is under the dash in front of the driver

Have the engine's obd-II computer scanned with an obd-II scanner at autozone or advance auto parts, or by your own obd-II scanner that you can buy for under $100 at Walmart or Sears.

This will help to identify which circuit is bad on the vehicle, or what system is causing the SES light to go on.

Good luck on this diagnosis and repair.

Here are some possible causes and fixes http://www.obd-codes.com/p0440

Sounds like a bad wiring connection in the egr circuit.

you need to find someone with an old type scan tool,or one that has an adapter for the older cars to read the codes. you can also do this by jumping 2 wires on tha obd connector and count the flashes. the first suggestion is the best. get the code and get back to me and we'll go from there. hope this helps Thanks Ray

Check the electrical connector above the modulator. If the connections are loose or the connector is damaged... similar things happened to mine.

does not have this obd 2 ,anything before 1994 does not have this ,u have a ald conector unde steering colum a code key will flash codes for repair

Sounds like the connector to the washer pump motor located under the washer bottle

the service engine soon light means that a fault has occurred in the engine control electronics or the emission system controls, and in your case the transmission will also set the light, when this light is on one or more of the following codes will be stored in the on board computers memory. follow the link below for a list of GM codes for your OBD 2 (On board diagnostics generation 2) electronic engine management system.

http://westersgarage.eidnet.org/obd2.doc

i had auto zone check the computer and was told i needed two sensor and i like know where they are located and if i can installed them my self thank you beepa1