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Buick Engine Light Codes1996 Buick Regal Grand Sport (Multiple Codes)

Question

1996 Buick Regal GS Grand Sport I have a 1996 Buick Regal Grand Sport with a 3.8 L engine. The car has about 200,000 miles and in early June I was driving home from work and the car shut down on me like a computer. Since then I have had several mechanics look at the car and told me that it was this problem and that problem.

I have changed the spark plugs, spark plug wires, battery, ignition control module, ignition switch, fuel pump/filter. I pretty much am sure that I need a new air flow and map sensors, but the code 629 I am not sure where that would even come from. Can someone please confirm what I need to do to get my car back on the road.

DTC Trouble Codes: P0102, P0107, P0300, code 122, code 1107, code 1122, code 629

Zachary from Hesperia, CA

Answer

Hi Zachary. The first thing that comes to mind is find a new (more qualified) mechanic! I hate to even say it but if multiple mechanics haven't been able to fix your engine light codes then I'm not sure we'll be able to help much more.

Generally you should fix trouble code issues in the order that the codes come up. For example if the P0102 code is the first in the list, then that's the one to fix first. Sometimes one code can cause further codes. In this case a code P0102 is Mass Air Flow (MAF) Circuit Low Input. What that says to me is there is a problem within the MAF sensor or the wiring & connectors leading to it. The P0107 code is Manifold Absolute Pressure/Barometric Pressure Circuit Low Input. A P0300 is a random misfire.

So if you just tackle the first code first, check the wiring and connectors leading to the MAF sensor. Visually inspect and use a DVOM (digital volt ohm meter) to verify the wiring. Then use the DVOM to verify the MAF sensor is working right, use a quality repair manual for the correct specs for your model. It may need to be replaced, but don't rush out and replace it until you know that's the problem, because what could be happening on your car is a bunch of wiring problems.

Get your hands on a quality repair manual and check that stuff out next. Good luck!

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