Where is the ecm located on a 99 buick regal?

yes
use a scan tool to reset the ECM

Reset ? Why ? check engine light on ? Have it checked for DTC'S - diagnostic trouble codes .An fix the problem

look under the dash on passenger side behind the glove box if i remember correctly. thats where gm put most ecms back then

hope this helps mike

should be on the fuel rail, take the plastic engine cover off and you should see the injector rails on either side of the supercharger, got to be real close to the line towards the firewall

there is a vacume leak to you emc from pvc valve located out of valve cover follow line to a round valve make shure it is hooked up and there r no leaks check all you vacume lines

The fans are controlled by the ECM and it uses the ECT sensor for temperature sensing, so if the check engine light isn't on the sensor is not the problem. You need to have an active test run on the fan system to see what code is returned. Have you tried powering up the fans at the relay?

PCM ( Power control module) under the hood on the left front side of engine bay in the air cleaner asssembly.

BCM ( Body control module ) behind the left side of dash, left of the steering column.

there is no ECM on this model the PCM is the engine controler.

All O2 Sensors, on any vehicle, are in both ends of the exhaust converter.
Sensor 1 sometimes is in the pipe before it,and a few veh in the exhaust manifold

Don't replace because of a code
Find out why the code was set

How warm does it get? The computer won't turn them on unless the coolant temp gets to 235

Your receiver is located in the trunk, On the passenger side. If you look at the speaker on the passenger side, about 4 inches back or 7: o clock mounted on the same panel that the speakers are mounted to is you receiver. A small square box like 2X2 with wires running tword the passenger side. If you see the bundle of wires attached to the trunk hinge and follow the only set running to the driver side is it.