Trouble With My Volvo 850 Service Light

Written by ty wright
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The Volvo 850 service light comes on at regular mileage intervals to remind the driver that the vehicle is due for service. The light does not mean anything is wrong with the car, and the car can be driven as normal. The service technician will usually reset the light, but if he does not, you can reset it yourself by following a simple procedure that takes no more than a few minutes.

Skill level:
Moderately Easy

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Instructions

  1. 1

    Turn the ignition key to position II.

  2. 2

    Pull the hood release lever and open the bonnet. Locate the two on-board diagnostic (OBD) units in the engine compartment labelled "A" and "B." They are next to the blue washer fluid cap.

  3. 3

    Open the cover to OBD "A."

  4. 4

    Insert the white connector pin into OBD socket 7.

  5. 5

    Press the "Test" button on the OBD terminal four times. Hold the button down one second each time you press it. Wait for the red LED light to turn on and stay lit.

  6. 6

    Press the button once. The LED light will blink off, then on again.

  7. 7

    Press the button five times. Hold the button down one second each time you press it. The LED light will blink off, then on again.

  8. 8

    Press the button once. The LED light will flicker.

  9. 9

    Remove the white connector pin from socket 7. Close the cover to OBD "A." The service light is now reset.

Tips and warnings

  • The OBD service light reset code to remember is 4-1-5-1. This is the sequence for how many times to press the button.
  • Some Volvo 850s have a small rubber grommet in the OBD instrument cluster. If your car has the rubber grommet, simply remove the rubber grommet and press the "Reset" button inside to fix the service light.
  • The directions above only work on 1993 to 1995 Volvo 850s. For the 1996 and 1997 models, the OBD II reset tool is needed. It can be purchased from a Volvo parts supplier.

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