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What is the engine code P21A8 on my 2012 BMW X5 35d Diesel? what is the problem?

Vehicle: 2012 BMW X5 35d Diesel

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The problem is more than likely the Reductant Level Sensor 'B'.

P21A8 MERCEDES-BENZ - Reductant Level Sensor 'B' Circuit
Read more: https://www.autocodes.com/p21a8_mercedes-benz.html

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