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.
13 62 531 Replacing coolant temperature sensor (N55)
Only perform this repair work on an engine that has cooled down.
Recycling
Catch and dispose of escaping coolant.
Observe country-specific waste disposal regulations.
Necessary preliminary tasks:
- Read out fault code memory of the DME control unit.
- Switch off ignition
- Remove IGNITION COIL COVER
Variant for hot countries only:
Release screw (1).
Tightening torque 17 22 4AZ .
Remove engine oil pipe and set aside.
Catch and dispose of emerging engine oil.
Unlock connector (1) and remove.
Unfasten coolant temperature sensor (2).
Installation note:
Tightening torque 13 62 5AZ .
If necessary, top up coolant.
Check COOLING SYSTEM for leaks.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.