Your Opel Cd engine control system detects a problem, the computer stores the diagnostic trouble
code P3078 in its memory.
To figure out what is wrong with your vehicle you must first extract the P3078 DTC For Opel Cd.
On 1999 and later P3078 Opel Cd engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.
P3078 Opel Cd DTC Meaning
Powertrain Code - Problem is related engine, transmission and emissions systems.
SAE - Generic
Exhaust Gas Recirculation System Valve 1
Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit
While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P3078 Opel Cd code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.