When Customer Does Not Have Valid Key

WARNING: This page is about a different car, the 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Immobilizer unit needs to be replaced with PCM. Perform "Both Immobilizer Unit and PCM Replacement" of the IMMOBILIZER SYSTEM REPROGRAM PROCEDURE. See BOTH IMMOBILIZER UNIT AND PCM REPLACEMENT .