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 (N52K)
Only perform these tasks 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 memory of DME control unit; if necessary, work through test schedules
- Switch off ignition
Lever out expansion rivets (1).
Press lock (2) and raise intake duct (3).
Detach intake duct (3) from air filter housing and remove.
Unclip Bowden cable for engine bonnet/hood actuator from transverse reinforcement (1).
Release screws on left and right sides. Tightening torque 51 71 4AZ, see 51 71 SEALS AND LOOSE BODY PARTS .
Remove cross-brace (1).
Coolant temperature sensor is mounted on cylinder head at front.
Unlock plug (1) and remove.
Release temperature sensor (2).
Installation:
Tightening torque 13 62 2AZ, see 13 62 SENDERS FOR CONTROL UNIT (1 OF 2) .
If necessary, top up coolant.
Check cooling system for leaks. See 17 00 009 CHECKING COOLING SYSTEM FOR WATER 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.