This is true. You'll need to drive your Toyota Camry at least 100 miles
(typically 2 weeks worth of everyday normal driving) to set the proper and
required smog check readiness flags. Readiness flags are internal tests your
car's emissions computer runs to make sure there are no emissions related
engine problems. Any time a vehicle's batter goes dead, is replaced, or
disconnect for whatever reason, the readiness flags get erased and have to
be reset. The only way to reset the readiness flags on your Toyota is by
driving it. Give it about two weeks and then take it in for its smog
inspection.
posted by SmogTips Support