Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2009335I 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMENGINE ELECTRICAL SYSTEM -- REPAIR (N54)
2009 BMW 335i 2D Convertible, Standard
Engine Electrical System -- Repair (N54)
2009 BMW 335i 2D Convertible, StandardSECTION Engine Electrical System -- Repair (N54)
- 00 Troubleshooting
- 12 Ignition Wires, Spark
- 13 Ignition Coil
- 14 Electronic Switching
- 12 14 521 Replacing Crankshaft Pulse Generator (N54)
- 12 14 523 Replacing Pulse Generator On Inlet Camshaft (N54)
- 12 14 524 Replacing Pulse Generator On Exhaust Camshaft (N54)
- 12 14 550 Replacing Control Unit (DME)
- 12 14 600 Removing/Replacing Knock Sensors (N54, N53)
- 12 14 650 Replacing Suction Pressure Sensor On Intake Air Manifold (N54)
- 12 14 651 Replacing Suction Pressure Sensor On Charge-Air Duct (N54)
- 12 14 700 Coding Control Module (DME/DDE)
- 12 14 705 Programming Control Unit (DME/DDE)
- 61 14 ... Removing and Installing/Replacing Engine Compartment B+ Terminal
- 31 Alternator With Drive
- 32 Regulator
- 41 Starter With Mounting
- 42 Starter Lead
- 51 Engine Wiring Loom
- 61 Oil Pressure-Oil Temperature
- 90 Control Unit Box
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.