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What does the fault code P1664 for a Mercedes mean?
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3 answers
★ Top Answer
The P1664 error code in a Mercedes Benz indicates an issue with the heater booster, a component designed to heat the engine coolant more rapidly than the engine's own heat. This problem appears to be quite prevalent in diesel Mercedes vehicles, with many online discussions addressing it. There doesn't seem to be a definitive solution, as most owners either get it fixed at the dealership or choose to drive without it. Fortunately, this fault won't prevent the vehicle from starting or significantly impact its everyday performance, especially in warmer weather.
More answers
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The P1664 fault code in a Mercedes indicates a problem with the electric heater booster system.
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Thank you so much for sharing information, but how do we resolve it, and where does the heater go? Thank you
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