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I was working on my car, fitting coilovers to be exact. Now before I started, there was absolutely no warning lights on my dash. Then once I had finished installing coilovers and turnt the car on. 3 lights lit up on the dashboard. The lights were the ABS, Traction control and the Tyre pressure lights.

I'm guessing I knocked a sensor or broke a sensor and that the sensor monitors all the of the above I mentioned?

My question is.. How do I go about correcting this..
Do I need to reconnect the sensor if it's even loose that is?
Do I need a new sensor?

I'm not sure what to do about this as I took it to a mechanic and he seems to think it's 3 Seperate problems and wants to charge me for fixing all three. However I know that it's not. The lights weren't on the dash before I started, only when I finished.

first, it's best to set a diagnosis with a scan tool like VCDS or at the dealer.
i suspect broken wiring or disconnected sensor connector.

you can check sensor connectors manually. if a sensor is disconnected, re-connect it by inserting the connector or fix the wiring.
if the sensor itself is broken, you can replace the sensor but then i think they will need adaptation