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Registered
Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,566
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My educated guess is the Radio died because something in its power supply shorted out and killed it. In the process, it shorted the 12V positive to something close to ground making your car act up. When your mechanic removed the radio, he removed the short and the car is running OK again. But, the battery has probably died a premature (or well deserved) death and is now refusing to connect to the diagnostic port.
Change the battery, let it reset, and see where you are.
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Porsche 2005 GT3, 2006 997S with bore-scoring
Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS
Disposable Car: BMW 530xiT, 2008 Mini Cooper S
Two-wheel art: Ducati 907IE, Ducati 851
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