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DTC Description

WARNING: This page is about a different car, the 2018 Hyundai Accent. However, it is still accessible from the selected car via links, so may be relevant.

B121400 is set when Rear Left Sensor* cannot transmit LIN data or transmits abnormal LIN data to BCM* because there is Faulty Power Supply, or Open/Poor Contact, or Short in LIN Circuit.

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