BMW Repair: web, coolant temp, plese

Question
hi, first of all i like to thank you for your service.

plese recomend some useful websites for following question & more.  

1--i want to understand the basic auto electrical troubleshooting.

2--how to check auot sensors such as coolant temp, O2 & etc.

thank you!  

Answer
Asif,
 There are some good sites for the things you need, as I would be here all day trying to tell you how to do this:

 www.bimmerdiy.com
 www.pelicanparts.com (technical info)
 www.e30tech.com
 www.bmwe30.net
 
 Hope this helps,
 Josh