Hi

I have recently been having problems starting my car and was told that the transponder may be the issue, A mechanic bypassed it and now it starts up perfectly, however the instrument cluster stopped working.

None of the gauges nor the indicators or rear lights work.

Please could you assist in helping me find the problem and the solution to that.
Thank you.

Transponder you mean the little black box (boardnetz box). Picture of the transponder and or part number makes it easier to understand what was bypassed.