UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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The key and key reader usually need programmed/calibrated to operate with a new ecu.This may be the cause here with this ecu needing programmed.On some models the key and reader need replaced as well to match the ecu installed or programmed to the ecu after replacement.
I would also have the wiring checked on the engine leading to the coils and ecu to see if any wiring faults are found needing repaired or replaced for this fault here.
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