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 (N54)
Danger of scalding!
Only perform these tasks on an engine that has cooled down.
Recycling
Catch and dispose of escaping oil and coolant.
Observe country-specific waste-disposal regulations.
Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Switch off ignition
- Remove acoustic cover
- Remove fan cowl
Release screw.
Tightening torque 17 21 1AZ. See COOLING SYSTEM - TIGHTENING TORQUES - SEDAN .
Disconnect oil line (1).
Catch and dispose of emerging fluid.
Installation:
Replace sealing rings.
Unlock plug (1) and remove.
Release temperature sensor (2).
Installation:
Tightening torque 13 62 1AZ. See 13 62 SENDERS FOR CONTROL UNIT
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.