I have a 2000 A8L, with approx. 100k miles on it. Last week the airbag light came on, and is throwing the following 2 codes. 00558 and 00588. Just wondering if there might be a DIY fix for these codes. Also I have been noticing a clicking sound coming from around the steering column, under the dash. Wondering if the clicking might have something to do with the fault. Any help will be appreciated.

Mike