Update: 2001 SSEi Anti-Lock, Stability Control, Trac
Problem solved by replacing just-installed new left front hub. I started getting these lights, intermittently, after driving up to 50 miles. Towards the end of my diagnosis I began getting slight ABS buzzing just before lights came on. Usually if I let the car sit for an hour or two there would be no lights on startup; only after driving for 10-50 miles.
Took her to a GM dealer to have codes read (what choice did I have?). Those inexpensive code readers at Autozone, PepBoys etc. WILL NOT READ ABS OR AIRBAG CODES!
The Tech II pulled a U1212 indicating a left front speed sensor. I thought, "crap, I just installed that thing!". Anyway I called the place where I purchased the two fronts a couple of weeks earlier. I mailed them a copy of the GM diagnosis and I had a new hub in the mail the next day. This time the hub took only about an hour to fix (after all this was my third hub in two weeks (two fronts plus 1 replacement)! So far all is working well.
2001 SSEi- black; stock 92K
1995 Vette; Competition Yellow; stock; 38K