Question

What would cause the B1845 code on a 2000 Ford Explorer 4.0L and how do I get the vehicle to start?

Answer 1

B1845  Ignition lock ,anti theft  switch failure, Disconnect the battery, then reconnect and retry,

Answer 2

B1845 Ford Code - Ignition Tamper Circuit Failure
Read more: https://www.autocodes.com/b1845_ford.html