If you have a GM built car, you should have one on hand. , with my old very standard plug and diagnostics block at first you could only read half of what the block did. The icarsoft unit was able to find more codes to diagnose the problem and comes with a free and even a PNY branded mini SD card!
eTORK 3/8-Inch Drive "Click Style" Electronic Torque Wrench: Precise Torque Control (25-250 In. lbs., 2-20 ft.-lb.)
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