Check the fuses and relay to make sure nothing blown off while charging the car lamp or something. These electrical issues arent very easy to troubleshoot, but when you get there you feel OMG how can i miss that.
If still light remain on, get the computer check done to find the real problem. As it might possible that this light is coincidental appear when you charge lamp but its pointing to something serious/major.
Check the coolant level is low? Is coolant or engine oil turn milky? Are you loosing power?
If answer is yes to all/any of above question with white smoke from exhaust that means your engine head gasket is blown and leaking. It started mixing oil and water/coolant and its time to fix this ASAP before other damages start.
You need to open the brake caliper hose retaining bolt to make it free.
See it in this article nicely explained
http://www.freeautomechanic.com/brake-caliper.html
My RS4 has done 5600 km as of now and i had the first front right shock change in 0ct 2009 and now another two shocks are gone.
dose anybody know how can this happen