coil pack ground broken
 

I was replacing the coil pack on my B5 A4 2.8 and broke what looks like a fancy ground wire coming off the coil pack wiring harness. It's a single wire into about a 1-inch long black rectangle bolted to the front drivers side bolt. Does the computer get information from this little piece?

Is this piece critical and can I just secure the wire under the bolt? Thanks.