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156 Engine, exhaust system and fuel ›
Regulations
Variants of the CNG sticker in natural gas vehicles .
Position of the sticker
Regular gas system checks
On natural gas-powered vehicles regular gas system
checks must be carried out at a specialist workshop.
The vehicle operator is responsible for ensuring
these tests are carried out properly.
For new cars, this is after 4 years and then every 2
years
Check the gas system for leaks and carry out an
▶
examination of gas containers.
Check the filler cap.
▶
Check the condition of fuel filler tubes and the
▶
sealing ring in the fuel filler tubes, and clean sealing
ring if necessary.
Lifetime of the containers
The lifetime of the natural gas containers is max. 20
years.
›
Ensure the gas tanks are replaced at the appropri-
ate time.
Indicates the natural gas system test.
illuminates
Notification regarding the remaining days until
the natural gas system is checked
›
Ensure the test is carried out by a specialist com-
pany.
NOTICE
If the natural gas system is not tested by the due
date, the natural gas drive will not be available in
your vehicle.
Functionality
A natural gas vehicle also has a petrol en-
gine
» page
153,
CNG (compressed natural gas)
Natural gas operation display
illuminates
Automatically switching over from natural gas
mode to petrol mode
The vehicle automatically switches from natural gas
to petrol, for example, if the following situations oc-
cur.
With an empty natural gas tank or insufficient
▶
pressure in the tank.
After natural gas refuelling - the fuel system of the
▶
vehicle determines the quality of natural gas.
At very low ambient temperatures.
▶
WARNING
Danger of remaining in traffic.
Once the warning light comes on
▶
as soon as possible.
Never fully empty the petrol tank.
▶
Track the range with natural gas in the drive data
▶
menu item
in good time.
Every six months, to ensure the correct function-
ing of the fuel system, it is recommended that the
fuel tank for petrol should be run down until the
warning light comes on
Requirements for refuelling
✓ Vehicle unlocked.
✓ Independent car heating switched off.
✓ Ignition off.
Refilling
›
Open the tank flap.
The refuelling system stops the refuelling process
automatically when the tank is full.
fill up with gas
» page
67. Plan to fill up with natural gas
.
›
Remove the cap
from the natural gas
filler neck.
›
Plug the coupling of
the refuelling system
onto the filler neck and
start refuelling with
natural gas and while
doing so, follow the in-
structions given on the
refuelling system.
A
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