How do you clear the check engine light on a Volvo 940?

Answer 1

to clear a "check engine" light on a Volvo 940:

First you have to plug the test cable into socket 2 for fuel injection or 6 for ignition codes. The codes are read as groups of red led flashes.

1)turn the ignition switch to "run" position, press the diagnostic button for 5-8 seconds, then release. the LED would come on.

2)press the diagnostic button for over 5 seconds until the LED goes off.

3)press the diagnostic button for 1-3 seconds, if the LED shows "1 1 1" , that means the DTC have been cleared.

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