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What could be the reason for the unresponsive fuel gauge in a BMW 5 Series?

2 Answers

DiJuliet

07/28/25 11:21pm

The unresponsive fuel gauge in a BMW 5 Series may be caused by a faulty fuel level sensor or issues with the corresponding relay. Below is relevant information about the 2021 525Li M Sport Package BMW 5 Series: 1. Powertrain: Equipped with a 2.0L turbocharged 4-cylinder B48B20C engine, paired with an 8-speed automatic transmission. 2. Dimensions: Length, width, and height are 5106mm, 1868mm, and 1500mm respectively. The wheelbase is 3105mm. 3. Chassis: Features rear-wheel drive with front double-wishbone independent suspension and rear multi-link independent suspension, built on a unibody structure.

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TaliaDella

08/12/25 3:44am

Oh, encountering a non-illuminating fuel gauge in a BMW 5 Series is indeed frustrating, and I've seen this issue many times. The most common cause is a stuck float sensor in the fuel tank, often due to dirt buildup or aging deformation, which prevents it from moving after refueling. Another possibility is loose or short-circuited wiring, particularly the connections between the fuel gauge and the dashboard—loose connectors can interrupt the signal. A blown fuse is also a frequent culprit; check the corresponding fuse in the instrument panel fuse box, as it’s prone to burning out. Given BMW’s complex electronic systems, sometimes the vehicle’s computer module malfunctions and misinterprets the fuel level signal. Ignoring this issue can lead to running out of fuel mid-drive, increasing the risk of accidents. I recommend first checking if the fuel cap is tightly closed, then trying to start the engine a few times to see if the fuel gauge responds. If that doesn’t work, it’s best to visit a dealership for a diagnostic scan—professional technicians can quickly resolve the issue. Don’t delay repairs.

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