It may be a used unit. We mark our EZL (ignition modules) with a paint marker to determine if they are ours or not. Sound like a warranty issue that you should take p w/ the shop.

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1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

"Excuses are crutches for the unfounded."