: Not on - Not Working Check Engine Light 2001 Cadillac STS - cannot pass Smog now

11-08-12, 03:23 PM
I have a 2001 Cadillac STS - the check engine light will not work - it's off - and now I cannot pass Smog Test in Nevada as Check Engine Light MUST be on and working! Plus, I have a PO410 Code showing Secondary Air Injection System.

11-08-12, 09:57 PM
Try the Seville forum. Most members here have the very different 2005 & up STS.