2001 Land Rover Discovery II V8 OBD Code P1668 - Immobilizer Issue and Starting Problems

Model: 2001 Land Rover V8 Disco II Fault Code: P1668 Posted: 2011-02-03 20:33

My wife left the 2001 Land Rover Discovery II V8 at home for about 3 hours. When she returned, the vehicle would not start — it turned over normally but failed to fire up. I have since brought it back home and used an OBD-II scanner to retrieve fault code P1668. After researching, I understand this code is related to the immobilizer system, specifically indicating a possible open circuit in the CAN data bus or issues with the immobilizer signal. The most common causes include wiring faults or problems with the ignition switch's receiver coil. I'm now looking for confirmation and troubleshooting steps to resolve this issue safely.