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 MANUALSBMW2011135I 2D CONVERTIBLE, AUTOMATIC DCTREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMENGINE ELECTRICAL SYSTEM - REPAIR
2011 BMW 135i 2D Convertible, Automatic DCT
Engine Electrical System - Repair
2011 BMW 135i 2D Convertible, Automatic DCTSECTION Engine Electrical System - Repair
- Troubleshooting
- 61 20... Battery replacement information
- 12 00 Contents of Engine Electrical System General
- 11 00... Handling components after flood damage
- 12 00... Instructions for removal and replacement of control units
- 12 00... Instructions for working on the ignition system
- 12 00... Instructions for connecting and disconnecting test units
- 12 00... Instructions for welding work (overload protection of control units)
- 12 00... Instructions on component testing
- 12 00... Notes for disconnecting and connecting battery
- 61 00... Notes on handling wiring harnesses and cables
- 12 00... Notes/information on start assistance (jump starting)
- 00 Safety information for working on vehicles with automatic engine start-stop function (MSA)
- Ignition Wires, Spark Plugs
- Ignition Coil
- Electronic Switching Or Control Units
- 12 14 700 Coding control module (DME/DDE)
- 12 14 705 Programming control unit (DME/DDE)
- 12 90... Removing and installing/replacing electronics box
- 12 14 600 Removing/replacing knock sensors (N54T)
- 12 14 600 Removing/replacing knock sensors (N55)
- 12 14 524 Replace pulse sensor on exhaust camshaft (N54T, N55)
- 12 14 651 Replace the pressure sensor on the charge air duct (N54T, N55)
- 12 63 520 Replacing DME master relay (N54T)
- 12 14 550 Replacing control unit (DME) (N54T)
- 12 14 550 Replacing control unit (DME) (N55)
- 12 14 521 Replacing crankshaft pulse sensor (N54T)
- 12 14 521 Replacing crankshaft pulse sensor (N55)
- 12 14 650 Replacing differential-pressure sensor on intake plenum (N55)
- 12 90 100 Replacing fan for electronics box
- 12 14 523 Replacing pulse sensor on intake camshaft (N54T, N55)
- 12 14 650 Replacing suction pressure sensor on intake plenum (N54T)
- Alternator With Drive And Mounting
- Controller
- Starter With Mounting
- Starter Lead
- Engine Wiring Loom
- Oil Pressure/Oil Temperature/Oil Gauge
- 12 61 285 Remove and install or replace the oil level sensor for engine oil (N54T)
- 12 61 285 Removing and installing/renewing oil level sensor for engine oil (N55)
- 12 61 280 Removing and installing/replacing oil pressure sensor (N54T)
- 12 61 280 Removing and installing/replacing oil pressure sensor (N55)
- Switches And Relays
- 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.