Mercury Grand Marquis 2004 ECU
I have installed a new ECU from a reputable supplier in my Mercury Grand Marquis 2004. The dash goes blank when key is turned to start. Car would staret half an hour previously with old ECU, battery is new. Any ideas?
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Answers
2025 Ram 1500 Laramie 4x4 / 2023 Mercedes EQE 350 4Matic
Sometimes larger locksmiths have the equipment to program the keys as well.
2025 Ram 1500 Laramie 4x4 / 2023 Mercedes EQE 350 4Matic