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What Is DTC in a BMW?

A Diagnostic Trouble Code is the actual data behind a warning light – a 5-character code identifying which system and component triggered it. Here’s how to read one.

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Close-up of a luxury car gear shift knob

What Is D3 in a Car?

It locks your automatic to gears 1-3, trading fuel economy for more power and stronger engine braking. When to use it, and why it costs you at the pump.

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