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 (N62, N62TU)
Only perform these tasks on an engine that has cooled down.
Necessary preliminary tasks:
- Read out fault memory of DME control unit; if necessary, work through test schedules
- Switch off ignition
- E65 only. E66:
Remove design cover .
Recycling
Catch and dispose of escaping coolant.
Observe country-specific waste-disposal regulations.
Coolant temperature sensor is mounted on water pipe at front.
Unlock plug (1) and remove.
Release temperature sensor (2).
Installation:
Tightening torque 13 62 2AZ .
Vent cooling system and check for leaks. See 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (N62, N62TU) .
If necessary, top up coolant.
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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.