Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Shut-off valve (Bi-fuel)
There are shut-off valves on the gas tanks to open and close the tank valves on bi-fuel cars.
These are positioned at the inlet/outlet on each gas tank. There is one for LPG and three for CNG.
The valves are controlled electro-magnetically and powered via a relay directly connected to the rear electronic module (REM). The rear electronic module (REM) activates the relay when a request for gas power is transmitted on the controller area network (CAN).
The valves close when the car is running on gasoline, when the ignition is switched off or in the event of a collision.
The valves can be opened via a diagnostic command by activating the relay for the gas valves. Activation is carried out in VIDA via the vehicle communication socket. See function group 3, Rear Electronic Module (REM).
The valves can also be closed manually using an Allen key or opened by unscrewing the shut-off valve and replacing it with a special tool.
There are diagnostics for the shut-off valve relay.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.