One problem related to battery has been reported for the 2006 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Ford Mustang based on all problems reported for the 2006 Mustang.
2006 Mustang gt manual transmission. Replacement of battery results in engine stalling with air conditioning on when clutch depressed. . The owners manual states on replacing battery the computer needs to relearn idle. This does not work at least not in a reasonable amount of time. The vehicle has been driven over a number of days with no improvement. With the air conditioner running and depressing the clutch either coming to stop or turning a corner the engine idle will drop far enough where the vehicle will stall resulting in a loss of power steering and power brakes possibly creating a dangerous situation. The vehicle ran correctly before the battery replacement and only has 22,000 miles. Googling this issue on the internet finds numerous problems which are identical of which owners of the 4. 6l Ford v8 (not just Mustang) are reporting idle and stalling problems after replacing the battery and with the issue not resolving itself as the owners manual states resulting in either a computer reflash or throttle body replacement. This defect could result in a crash causing serious injury or death. Ford should recall affected vehicles and have the default idle setting set for a higher value so the air conditioner when engaged does not result in the engine stalling. The idle of engine is erratic with the air conditioner on since it is engaging and disengaging due to the low idle speed < 500rpm. By not using the air conditioner the idle speed will return to its normal speed of around 600 to 700rpm but still fluctuates slightly. Not being able to use the air conditioner is not acceptable, especially in the south east. The control feed back of the idle system is incorrectly operating with the air conditioner load on it.