How Do I Replace the Temperature Sensor in a '99 Volkswagen Passat?

Written by angelo elia
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How Do I Replace the Temperature Sensor in a '99 Volkswagen Passat?
The Volkswagen Passat is a compact and affordable sedan. (the car on the blossoming meadow image by Oleg Mitiukhin from

The 1999 Volkswagen Passat is an affordable and compact sized sedan that is reputed for its German engineering; over time, however, the coolant temperature sensor will stop work properly, and it will need to be replaced. The temperature sensor is located underneath the bonnet, on the passenger side of the engine. In order to gain access to the sensor, numerous engine components must be removed. It will take about 45 minutes to replace the temperature sensor on the Passat.

Skill level:

Things you need

  • Screwdriver
  • Stubby slotted screwdriver

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  1. 1

    Open the bonnet of the Passat and make sure the engine is cool. It is highly dangerous to work on the engine when it is hot.

    How Do I Replace the Temperature Sensor in a '99 Volkswagen Passat?
    Park the Passat on level ground and open its bonnet. (green landscape with car image by Oleg Mitiukhin from
  2. 2

    Loosen the four plastic screws located on the plastic cover that surrounds the intake manifold, using a screw driver in a counterclockwise motion.

  3. 3

    Turn to detach the hose that connects to the air filter and unclip and remove the air filter from the engine.

  4. 4

    Pull and detach the Mass Air Flow sensor, located near the air filter.

  5. 5

    Pry and remove the horseshoe-shaped plastic spring that connects to the coolant temperature sensor, using a Stubby slotted screwdriver and pull the sensor upwards to remove it from the Passat.

  6. 6

    Pull the small O-ring off the temperature sensor and attach it to the slot on the new sensor.

  7. 7

    Repeat the above steps in reverse order to install the new temperature sensor on the Volkswagen Passat.

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