COMPLETE GUIDE · WORKSHOP RELEASED
BMW fault-code and symptom baseline
BMW 3 Series Touring · E91 LCI · 320i · N43B20 · Any
A non-destructive diagnostic tutorial for recording symptoms, voltage context, control-unit fault codes and freeze-frame/live observations before any code is cleared or part is replaced.
4/4 steps released · 2 linked sources · about 35 minutes.
- Separate a symptom from a diagnosis.
- Capture codes and context before changing vehicle state.
- Avoid clearing evidence or commanding unsafe actuator tests.
- Produce a concise baseline another technician can review.
FASTENERS & TIGHTENING
Check the hardware before you start
No separate verified fastener map is published for this guide. This does not mean no fasteners are involved. Follow the released steps and their cited specifications; if a required tightening or replacement rule is missing, stop and verify it.
How WrenchGuide treats fastener information
Material, reuse policy and tightening method are separate facts. Torque plus angle alone does not establish that a fastener is torque-to-yield or single-use. WrenchGuide will not invent a torque value or replacement rule.
Loading parts and tools…
Loading your workshop…
MY WORKSHOP JOURNAL
Remember how your car came apart.
Attach private notes and your own teardown photos to the exact procedure step. They stay on this device in the current local-first beta.
Write the symptom before connecting a tool
Take a quick photo before disconnecting or removing something you may need to identify during reassembly.