I have a pioneer radio model number avic x850bt and my battery died and I got a new one now the radio wants a code.. I don't have the code for the radio please help

The correct radio SERIAL NUMBER is required for a code

First remove the radio from the dashboard.

Removal Info here

www.fitaudio.com

Then post the radio make+model plus all the letters+numbers on any labels,barcodes and a 14 character Serial Number stamped in the metal casing.

This information can then be used to see if a code can be calculated

A CLEAR photo of any labels is also very useful
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• Radio code advice always available here

The code would have been in the instructions ( user/ operator manual) for the installation of the radio or on a tag on the back of the radio