I have a 2020 jetta S 1.4 i had bought this amp adapter tried hooking it up saw that the radio wouldn’t turn on long story short i put everything back to how it was no amp after i did that car won’t start i get no power to anything i can use my key fob to unlock and open it i can power on the radio on i checked fuses relays everything seems fine but still car wont turn on

 

Welcome to the forum.

Its nice to see you made an intro on your own.

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.

Please tell us your car spec in your signature