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Diagnostic codes question 700 1990

90 740 turbo with bosch injection.

Position 1 I get 1-2-1 MAF. This make sense because the car is trying to stall when it's cold.
My question is for the other error codes. When I push the button 2 and 3 times respectively. I get quick blinks that dont stop until I unplug the probe. Is this normal? Three pushes also produces a clicking sound from my injectors.

Should I disconnect the battery to reset the system?
Any replies appreciated.








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