I have just purchased a 98 blazer ls and have a couple of questions. My SES light is on and was told by Auto zone that it was low pressure in the evap system. Okay, I got a new gas cap after inspecting the old one and finding a lot of cracks in the gasket. No change, okay I want to reset the ECM and clear all of the codes can I do this without losing the security code for the theftlock radio? How do I retrieve the radio code?



98 blazer ls
4.3 /auto
4wd
157000 mi.

 

You can clear codes using most code scanners available at places like Advance Auto or similar.