Dear U.S. Diver,
Hope you're well and stay so. About 18 years ago (circa 2004) I bought spare engine and ignition computers (gently used), tested them (by replacing the factory-original unit and driving the car), and stored them in a climate-controlled area.
In 2004, these cars were a decade or less old. So, it could not have been clear how long the factory-original engine and ignition control modules would last. Fast forward: all of the factory-original units work well.
Still, should a fault trace back to the engine control (or ignition) module, I can take a "used, known-good" unit, install it (20 minutes), and keep on rolling.
My risk: that a "used, known-good" unit could "go bad", despite careful storage. I'll take that risk.
As used units are now >25 years old, it is best to buy a re-manufactured unit. Install it and drive the car for a few days. If all is well, put back the factory-original unit and keep the re-man unit for a "rainy day"!
Hope this helps.
Yours faithfully,
Spook
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