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 Engine Coolant Temperature Sensor (N73)
Necessary Preliminary Tasks:
- Read out fault memory of DME control unit.
- Switch off ignition.
- Remove design cover.
Only perform these tasks on an engine that has cooled down.
Recycling
- Catch and dispose of escaping coolant.
- Observe country-specific waste-disposal regulations.
Disconnect plug (1) from temperature sensor.
Release temperature sensor (2).
Tightening torque, refer to 13 62 2AZ in FUEL SYSTEM - TIGHTENING TORQUES .
Assemble engine.
Check function of DME.
Check cooling system for leaks. Refer to 17 00 009 CHECKING COOLING SYSTEM FOR LEAKS (N73) .
If necessary, top up coolant, refer to 17 00... INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .
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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.