How to repair a camshaft position sensor on an audi a4

Written by nicki callahan
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How to repair a camshaft position sensor on an audi a4
In 1997, Audi added the option for a 1.8-litre, four-cylinder engine. (yellow gold luxury car image by alma_sacra from

In 1996, the Audi A4 was only available with a 2.8-litre V6 engine. In 1997, Audi added the option of a 1.8-litre four-cylinder engine, mainly in the sedan model. This article is going to deal with 1997 to 2000 1.8-litre, four-cylinder engines only. The camshaft position sensor is vital to engine timing and emissions. Although replacing the camshaft position sensor is a challenging task, with the correct tools, competent directions and about two hours, a home mechanic should be able to do it.

Skill level:

Things you need

  • Wrench set
  • Ratchet and socket set
  • TORX Wrench T45
  • Retaining tool No. 3036

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  1. 1

    Disconnect the battery by loosening the negative batter cable clamp. You can use a small wrench to do this.

  2. 2

    Locate all engine accessory belts and remove them. Use you will need to loosen certain accessories to relieve tension on the belts.

  3. 3

    Locate all engine covers and upper timing belt cover. Remove these, using a ratchet.

  4. 4

    Rotate the crankshaft clockwise until cylinder No. 1 is at top dead centre. Use a long handle ratchet and socket.

  5. 5

    Release the tension on the timing belt. You will need to use the TORX wrench T45 to accomplish this.

  6. 6

    Remove the timing belt by pressing down on the tensioner. Rotate the tensioner toward the front of the vehicle by taking out the TORX boltm using the TORX wrench.

  7. 7

    Loosen all valve cover bolts with a ratchet and remove them. Slowly pull the valve cover off of the engine and set it aside.

  8. 8

    Locate the camshaft gear. This gear is going to need to come off, but you will need to use a special tool to hold it in place. Use a retainer tool No. 3036 to remove the retaining bolt from the gear and then pull the gear off.

  9. 9

    Locate the position sensor on the camshaft and remove it, using a wrench. There should be two bolts holding it in place.

  1. 1

    Replace the position sensor and tighten the bolts with a wrench.

  2. 2

    Reattach the camshaft gear and tighten the retaining bolt with a ratchet and socket.

  3. 3

    Reinstall the valve cover. Be sure to use a new gasket. Tighten all valve cover bolts with a ratchet and socket.

  4. 4

    Reposition the timing belt tensioner and reinstall the timing belt. Use the TORX wrench to tighten the tensioner.

  5. 5

    Reattach all engine and timing covers. Tighten the retainers with a ratchet. Locate all accessory belts and reinstall them. Make sure all belts are properly tensioned.

  6. 6

    Reconnect the negative battery cable and tighten the clamp with a wrench. Run the engine and check for proper operation.

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