To reset my computer do I take out the negative cable on the battery? If so is this alright to do? Thanks

O yeah one other thing... is there a way to tell if your suspension is going bad? I know that if you mess it up it makes a god awful boom and rattles if your car even still moves. We have construction going on around our city ( not to mention the bad road conditions ) Is it worth buying aftermarket suspension? Or should I wait until there is a problem? Thanks a lot

I know this is a weird question but I am just looking for any insight on what noises and feelings to watch for

 

Careful when you pull the battery or disconnect it in my case at least the radio needed the code I was lucky that I had it as the dealer charges another $110 to get the new code for you to enable your radio again, as well as the remote option on the keys went dead and they had to be reprogrammed...

 

I just took the - cable off the a4 yesterday for the time it took me to put the cat back in. and all seems good. at first the windows wernt 1 touch... but shortly later after starting it up again it worked