Mercury Grand Marquis 2004 ECU

tiopiratatiopirata Member Posts: 3
edited January 2020 in Mercury
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

  • tjc78tjc78 Member Posts: 16,740
    I’m thinking most likely the key (anti-theft) has to be re-coded to the car. Information on how to do it should be available with a quick Google. I’m not 100% sure but with a new computer this may require a dealer visit.

    2025 Ram 1500 Laramie 4x4 / 2023 Mercedes EQE 350 4Matic

  • tiopiratatiopirata Member Posts: 3
    I am in Panama so no dealer. I shall wait to hear from the seller of course but I thank you for your advice.
  • tjc78tjc78 Member Posts: 16,740
    OK, some dealers that sell new ECUs offer pre-programmed keys. Without a dealer, this may be your only choice.

    Sometimes larger locksmiths have the equipment to program the keys as well.

    2025 Ram 1500 Laramie 4x4 / 2023 Mercedes EQE 350 4Matic

  • tiopiratatiopirata Member Posts: 3
    Thank you, will check this out. I have never had electronic keys or fobs for this vehicle so hoping it may not be an issue.
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