Why is your over drive light flashing on your 99 Lincoln Navigator?
The emissions on or flashing on 2003 Lincoln Navigator indicates a malfunction or error being reported by OBDII system. The code must be read through a computer reader and the vehicle checked by qualified technician/facility. Leaving such conditions uncorrected can affect everything from gas mileage to causing the expensive replacement of catalytic converters.
How long can you drive 1998 Chevy Tahoe after service engine light comes on for catalytic converetr?
If the check engine light is on steady you should have it checked as soon as possible to avoid costly repairs, it may be a minor problem, however if the check engine light is flashing, have it checked immediately! If you continue to drive with the check engine flashing you risk catastrophic damage to the catalytic converters costing you big $$$.