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throttle module under hood attached to the intake manifold needs replaced
What year and model
in the upper control module
Replace the ABS module - from what I read it will cost about 900 bucks
P1651 is the same as Volvo code 981A, engine control module internal fault / faulty signal.
In the 1989 Volvo 740 GL with a Bosch system it is located just above the steering column on the dash.
Probably a bad ignition control module..Autozone for $105-$160..
Trouble code P0611 means: Furl injector control module - performance
Trouble code P1618 means: Diagnostic Trouble Code (DTC) in another control module
Under Dash Passenger side to the right of the kick panel
You can't. The idle speed is controlled by the Engine Control Module or ECM.
On the right side of the throttle pedal