My 2005 Mustang GT started to display the P0340 code 2 weeks ago. I cleared the code twice and it came right back. After researching the error code over the internet, I decide that I will change my Alternator in the next couple of weeks. Well over the Memorial Weekend, I notice my dashboard lights getting dim by the minute, then my radio and all the lights shut off. The car stayed on I was lucky I still had battery power. I was not too far from my girlfriends house and drove it there. It sat stayed in her driveway 2 days. I had to wait until tuesday to get a new Alternator. My Mustang GT is out of warranty and I purchase my alternator from Auto zone. It cost me $214 plus $50 for the core exchange. The alternator is 135 amp verse the Ford stock Alternator is only 130 amps. The only problem it was special order from Autozone. So a long story short..... you have about 2 - 3 weeks from when you get the P0340 code to when your alternator fails.
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