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Hello, I’m new here but wanted to take the first step toward posting. As you can see in the title I have a 1991 Grand Prix. I just finished getting my DIY exhaust mocked up and ready to weld and I will try to post pictures of it soon as well as other things. I have all new KYB struts and just ordered the rest of the parts I need to build rear coil overs, with the intention of lowering the car a lot. Will start a thread on that soon. Glad to be here.

*It basically adjust the steering feel when going thru a parking lot and then tightens up when on the highway or Interstate*. almost......lol, not quite.... the sensor is there to 1. disengage the a/c .... 2. send a signal to the ecm to raise the engine rpm when the vehicle speed is so slow that the engine rpm is to low to adequately assist the needed power steering pressure. When the pressure in the system drops to a pre determined pressure that switch opens, the ecm *sees* that & raises the engine rpm to increase the pump rpm & power steering pressure. The sensor is referred to as Idle Speed Power Steering Pressure Switch

Check the obvious things, is the brake fluid level full? is the switch used to measure it working? Same goes for the parking brake pedal, try lifting on that to see if that causes the BRAKE light to go out High mount won't cause any of that on these cars. As for the ABS, yeah you need an appropriate scantool to read those codes. I use both a Tech1 or Tech2 to pull those codes, if you're anywhere near Pittsburgh I could pull them for you. Likely you have a couple separate issues, but on a 93' the ABS light is a non critical light, you just won't have any anti-lock is all.