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If the key will turn in the ignition cylinder, the only other fault the key can have is a missing or damaged resistor. The resistor is in the middle of the key and looks like a small black oval. The resistor has one of 16 specific values and is "read" by the Pass-key module. If you have a vehicle with 30K or more on the odometer that won't start, and everything else is good, (battery, starter etc…), the most likely problem is the two little wires that connect the Pass-key module to the ignition cylinder. These wires have to flex each time the cylinder is turned and eventually break at the ignition cylinder. The only reliable repair is to replace the ignition lock cylinder and key. New Ignition lock cylinders do not come with real ignition keys, only a temporary key to identify the cuts. If the cylinder is changed you have to purchase a new key separately to match the old key resistor and then cut to match the new lock cylinder.

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Q: How do you know if your key is bad 1992 Cadillac?
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