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.
if you have any question, please contact my at email@example.com jerry
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