BMW 3 Series Shaking At Idle — Misfiring Cylinder
BMW 3 Series shaking or vibrating at idle with rough running indicates a misfiring cylinder. P030X codes identify the specific cylinder. Common causes: failed ignition coil (most common), failing spark plug, or injector fault. Swap coil packs between cylinders — if misfire moves, replace the coil. Coil: £30-80.
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No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this BMW 3 Series 2005 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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