One problem related to battery cable has been reported for the 2006 Ford Focus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Ford Focus based on all problems reported for the 2006 Focus.
The key gets stuck in the ignition and won't come out. I have to remove one of the battery cable from the battery, remove the key from the ignition, then replace the battery cable back. This has happen more than once.