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alternator wouldnt stop vehicle from re-starting let sit awhile then restart --alternator charges and runs just about all components on vehicle mechanic should have dont a test on alternator and battery [which can be done for free at most auto stores ] sounds more like a shorting --loose connections damage to a harness or bcm fault[y]
check engine light on when tested it says bad o2 sensor did you replace 02 sensor it takes driveing it so many miles before light will go off give it couple days you dont need cadillac converter check engine light will go off cv joint they click as you turn dont let a mechanic sell you something you dont need its very rare for cadillac converters to go bad its common for o2 sensors to go bad like yours did but when 02 sensors are replaced it takes driveing it for awhile before it resets itself you also have more then one 02 sensor was then wrong one replaced they screw into your exaust manifold
The light indicates that the car's computer thinks that there is something wrong with one of your systems. There is an OBD-II port under the dash, probably on the driver's side. If you take your car to Autozone (or perhaps another automotive store of the same sort), they will be happy to attach their code reader to your port and tell you what codes the computer is indicating. They don't charge anything to do that, and you will then know what the computer thinks is wrong.
Hope this helps you.
Likely you have a bad connection on one of the dash connector plugs. Generally if they come on when you smack the top of the dash when they go off that verifies it. If so, remove the dash face and gauge panel (use manual) and clean contacts.
below the radio in the dash there is the module looks like a heat sink has a 10mm headed bolt holding it to the dash frame very common for these to burn out
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