Having problems with your BMW X3 Series ?
Bmw po305 code fix - X3 Series BMW Cars & Trucks
P0305 means misfire on number 5 cylinder, could be bad plug, ignition coil, injector, or wiring, or low compression , carry out a compression test if ok I would try a new coil on number 5 cyl
Repair Help & Product Troubleshooting for BMW X3 Series
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