Does my car computer need to be updated?

Talked to a mechanic he said that my cars cpu needs to be updated i installed a neutral safety switch on my. Automatic 2000 honda accord and now my when i change from park to reverse/drive it goes into gear hard never did this before install and gear lights on dashboard don't work. Do you think if i update cpu it'll fix this problem?

Hi yes however you can't do it they HONDA has to do that with a new engine management system computer so do you have money to throw at it at least 1500 pounds or 2000 dollars and expensive thing fitting that neutral safety switch was it really worth it.

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