I had a front engine mount replaced on my 03 Camry 6 cyl in January. But afterwards my VSC and TRAC OFF light came on. That mechanic was not able to make it go away so I took it elsewhere where I was told that I needed a zero point calibration, which they were able to do...problem fixed. Just last week, a check engine light revealed a problem with Bank one sensor one (AF sensor), but the VSC and TRAC OFF lights came on again at the same time. My mechanic changed the sensor, and we cleared the check engine light with the old disconnect the battery, touch the cables together, and reattach the cables trick which worked...except the damn VSC an TRAC OFF lights remained. Back to the second mechanic, he said that when the check engine light came on it also threw a code that said that the zero point calibration that he had done was UNdone...my question is WHY? What is the connection between braking and emissions? Is this a common design problem that every one shares, or is it just lucky old me?