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Just a quick story... Last year my 16 started to go into limp mode when driving - some like "power reduction". Scan was showing TB position sensor. Removed TB and totally cleaned it up. Worked fine for around a month and then it came back. Replaced TB position assembly - same thing. Finally took it to dealer and they did a test on the battery - showed bad. Replaced battery and the gremlin never came back.
If you have electronics or warning light issues on any vehicle, the first thing to always suspect is the battery. These newer vehicles are highly susceptible to voltage changes or losses. Many systems simply just won't function if they are low even 1-2 volts. It's cheap, easy to inspect, and if you think you need one you probably do need one anyways.
Yea, just because the battery wil crank over the engine and start your vehicle, it does not mean that, down deep, the battery is good.
