One problem related to wiring has been reported for the 2003 Ford Crown Victoria. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Crown Victoria based on all problems reported for the 2003 Crown Victoria.
The wiring harness for the horn as well as for inside dashboard and dome lights was defective upon purchase when new. The dashboard and dome lighting was corrected by the dealer on the first try with no more problems. However, the horn wiring, etc. Was repaired under warranty five different times and I have paid out of pocket for two more repairs. The problem is still not repaired. The horn starts blowing spontaneously without warning when the car is sitting and stopped and also when running. It blows continuously until getting under the hood and disconnecting the wiring.