I took the 1999 deville in for its smog check (CA). When they plugged the car into the computer, the service engine light came on, along with traction control. Never seen either light lit on this car before. The actual emissions and visual inspection were fine, but the test failed because of the service engine light coming on. They say there is a P0606 code. Anyone else have this problem occur DURING the smog check? Hard to believe it randomly occurred at just the most inopportune moment-- anyone know if the smog check can CAUSE this failure? Any ideas for fixing, other than replacing the PCM?