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New key to start in the ignition?

Tiny
AOIFEKILROY
  • MEMBER
  • 2000 VOLKSWAGEN GOLF
  • 1.9L
  • TURBO
  • MANUAL
  • 15,000 MILES
If a mechanic changes the brain in the car will it need a. New key to start in the ignition. Just someone wired something wrong in the car and now it will on start on easy start pumps been changed brain been changed and timing belt and car wont start and turn key?
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Tuesday, November 11th, 2014 AT 7:36 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Just to clarify, the ECM was replaced.
Keep in mind that any time any of those modules get replaced, it will need to be programmed to your vehicle.
Without the relearning process the new module will not work.

https://www.2carpros.com/articles/how-a-car-computer-works-pcm-ecm-bcm

For this Golf it will need a VW specific scan tool to perform the programming.
I have attached the programming procedure below.

Please let me know of any questions.
Thank you.
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Sunday, October 3rd, 2021 AT 10:58 AM

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