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.
2018 BMW X5 xDrive50iFACTORY OEM SERVICE PROCEDURE
Exhaust System - Repair
- Exhaust System, Complete
- Mufflers
- 18 12 081 Removing and installing/replacing exhaust flap (N55)
- 18 12 046 Replace front intake pipe (N55)
- 18 12 031 Replacing rear silencer (N55)
- 18 12 030 Replacing the rear silencer (N63)
- 18 12 050 Replacing left or right center silencer (N63)
- 18 12 030 Replacing the rear silencer (N57)
- 18 12 031 Replace rear silencer (N20 PHEV)
- 18 12 046 Replace front silencer (N20 PHEV)
- Diesel Exhaust System Components
- 18 31 700 Cleaning diesel particulate filter
- 18 31 090 Removing and installing SCR catalytic converter (N57 with SCR)
- 18 31 140 Removing and installing exhaust system mixer (N57)
- 18 31 090 Removing and installing the front pipe (N57)
- 18 31 130 Removing and installing/replacing metering unit (N57)
- 18 31 080 Removing and installing/replacing the diesel particulate filter (N57)
- (18 00 018 Removing and installing complete exhaust system N57)
- (18 12 030 Replacing the rear silencer N57)
- (18 40 040 Removing and installing, sealing/replacing exhaust manifold N57)
- Catalytic Converter
- 18 32 050 Removing and installing/replacing catalytic converter (N55)
- 18 32 050 Removing and installing/renewing catalytic converters for cylinders 1-4 (N63)
- 18 32 060 Removing and installing/renewing catalytic converters for cylinders 5-8 (N63)
- 18 32 050 Removing and installing/replacing catalytic converter (N20 PHEV)
- Exhaust Manifold With Integrated Catalytic Converter
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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