2007 MERCEDES-BENZ C-CLASS SALOON fuel

Troubleshooting
28
3 Problem Possible cause/consequence Suggested solutions
±
The yellow engine diagnos-
tic warning lamp lights up
while the engine is run-
ning. There may be a malfunction:
R
in the fuel injection system or
R in the exhaust system or
R in the ignition system (on vehi-
cles with a petrol engine)
The emission limit values may be
exceeded and the engine may be
running in emergency mode. X
Have the vehicle checked as soon as possible at a qualified spe -
cialist workshop. =
The red SRS warning lamp
lights up while the engine
is running. G
Risk of injury
The restraint systems are faulty .
The airbags or belt tensioners
may either be triggered uninten-
tionally or, in the event of an acci-
dent, not be triggered at all. X
Visit a qualified specialist workshop immediately. <
The red seat belt warning
lamp lights up for 6 sec-
onds after the engine
starts up. 16 The seat belt warning lamp
reminds the driver and front
passenger to fasten their seat
belts. X
Fasten your seat belt (Y page 98). 16
Only for certain countries Practical advice
204_AKB; 2; 3, en-GB
mkalafa,
2007-06-26T23:11:51+02:00 - Seite 283 Z

Troubleshooting
28
5 Problem Possible cause/consequence Suggested solutions
<
The red seat belt warning
lamp flashes and you hear
an intermittent warning
tone. G
Risk of injury
Either the driver's or the front
passenger's seat belt is not fas -
tened and you are driving faste r
than 25 km/h or have driven
faster than 25 km/h for a short
time. X
Fasten your seat belt (Y page 98).
The warning lamp goes out and the intermittent warning ton e
ceases . G
Risk of injury
There are objects on the front-
passenger seat and you are driv-
ing faster than 25 km/h or have
driven faster than 25 km/h for a
short time. X
Remove the objects from the front-passenger seat and stow them
in a secure place.
The warning lamp goes out and the intermittent warning tone
ceases . 4
The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning. The level of fuel has fallen below
the reserve range. X
Refuel at the nearest filling station . Practical advice
204_AKB; 2; 3, en-GB
mkalafa,
2007-06-26T23:11:51+02:00 - Seite 285

Troubleshooting
28
7 Problem Possible cause/consequence Suggested solutions
You hear a warning tone. You have opened the driver's
door and forgotten to switch off
the lights. X
Turn the light switch to Mor* . You hear a warning tone.
G
Risk of injury
The driver or front passenger ha s
not fastened their seat belt. X
Fasten your seat belt (Y page 98). Accident
Problem Possible cause/consequence Suggested solutions
Fuel is leaking from the vehicle.
G
Risk of fire
The fuel line or the fuel tank ha s
been damaged. X
Switch off the ignition immediately.
X Remove the ignition key.
X Do not restart the engine under any circumstances .
The leaking fuel creates a risk of fire or explosion.
X Consult a qualified specialist workshop. You are unable to determine th
e
extent of the damage. X
Consult a qualified specialist workshop. You cannot detect any damage. X
Start the engine as normal. Practical advice
204_AKB; 2; 3, en-G
B
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Troubleshooting
28
8 Problem Possible cause/consequence Suggested solutions
The NECK-PRO head restraint
s
on the driver's and front-
passenger seats have been trig-
gered. Your vehicle has been involved in
a rear-end collision. X
Reset the NECK-PRO head restraints (Y page 303). Fuel and fuel tan
kProblem Possible cause/consequence Suggested solutions
Fuel is leaking from the vehicle.
G
Risk of fire
The fuel line or the fuel tank is
defective. X
Turn the key to position 0in the ignition lock immediately and
remove it.
X Do not restart the engine under any circumstances .
The leaking fuel creates a risk of fire or explosion.
X Consult a qualified specialist workshop. The fuel filler flap cannot be
opened. The fuel filler flap is not released. X
Unlock the vehicle (Y page 300). The opening mechanism is jam-
med. X
Release the fuel filler flap by hand (Y page 302).
X Consult a qualified specialist workshop. Practical advice
204_AKB; 2; 3, en-GB
mkalafa,
2007-06-26T23:11:51+02:00 - Seite 28
8

Troubleshooting
28
9 Problem Possible cause/consequence Suggested solutions
The fuel tank has been run com-
pletely dry on a vehicle with
a
diesel engine. There is air in the fuel system. X
Refuel the vehicle.
X Switch on the ignition for approximately 10 seconds (key in posi-
tion 2in the ignition lock).
X Start the engine continuously for up to 40 seconds until it runs
smoothly.
The fuel system is now free of air.
If the engine does not start:
X Wait two minutes .
X Repeat the starting procedure for up to 40 seconds.
If the engine still does not start :
X Consult a qualified specialist workshop. Practical advice
204_AKB; 2; 3, en-GB
mkalafa,
2007-06-26T23:11:51+02:00 - Seite 28
9

Troubleshooting
29
0 Engine
Problem Possible cause/consequence Suggested solutions
The engine will not start. You can
hear the starter motor operating. R
There may be a malfunction in
the engine electronics.
R There may be a malfunction in
the fuel supply. X
Turn the key back to position 0in the ignition lock before the nex t
starting attempt.
X Try to start the engine again (Y page 113). When doing so, remem-
ber that excessively long and frequent attempts to start the engin e
will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. Vehicles with a diesel engine:
The engine will not start. You can
hear the starter motor operating
.
The reserve fuel warning lamp is
on and the fuel gauge shows 0. The fuel tank has been run dry. X
Refuel the vehicle.
X Bleed the fuel system (Y page 289). The engine will not start. You can-
not hear the starter motor oper-
ating. The on-board voltage is too low
because the starter battery is too
weak or discharged. X
Jump-start the vehicle (Y page 328).
If the engine does not start despite attempting to jump-start it:
X Consult a qualified specialist workshop. Practical advice
204_AKB; 2; 3, en-GB
mkalafa,
2007-06-26T23:11:51+02:00 - Seite 29
0

Troubleshooting
29
1 Problem Possible cause/consequence Suggested solutions
Vehicles with a petrol engine:
The engine is not running
smoothly and is misfiring. The engine electronics or
a
mechanical component of the
engine control unit have been
damaged. X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist work-
shop .
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it. A coolant temperature of over
120 °C is displayed. The coolant
warning lamp may also be on and
a warning signal may sound
(
Y page 123). The coolant level is too low. The
coolant is too hot and the engin
e
is no longer being cooled suffi-
ciently. X
Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 209). Observe the warning notes
as you do so and top up the coolant if necessary. If the coolant level is correct, the
radiator fan may be faulty. The
coolant is too hot and the engin
e
is no longer being cooled suffi-
ciently. X
If the coolant temperature is less than 120°C, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. when driving on
mountain roads and stop/start driving . Practical advice
204_AKB; 2; 3, en-GB
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2007-06-26T23:11:51+02:00 - Seite 291

Locking/unlocking in an emergency
300 Locking/unlocking in an emergency
Emergency key
If the vehicle can no longer be unlocked or
locked with the key or the KEYLESS GO
key*, use the emergency key element.
If you use the emergency key element to
unlock and open the driver's door or the boot
lid, the anti-theft alarm system* will be trig-
gered (Y page 71).
There are several ways to turn off the alarm:
X Press the korj button on the key.
or
X Insert the key into the ignition lock.
or
X Press the KEYLESS GO but-
ton* (Y page 85).
or
X Lock or unlock the vehicle using KEYLESS
GO*.
If you unlock the vehicle using the emergency
key element, the fuel filler flap will not be
unlocked automatically.
X To unlock the fuel filler flap: insert the
key in the ignition lock. Releasing and removing the emergenc
y
key element 1
Release catch
2 Emergency key element
X Push release catch 1in the direction of
the arrow and at the same time remove
emergency key element 2from the key. Unlocking the vehicle
If the vehicle can no longer be unlocked cen-
trally with the key or the KEYLESS GO key*:
X Remove the emergency key element from
the key (Y page 300). $
To unlock
X Insert the emergency key element fully into
the lock of the driver's door.
X Turn the emergency key element anti-
clockwise to position $.
The door is unlocked.
i On right-hand-drive vehicles, turn the
emergency key element clockwise.
X Turn the emergency key element back and
remove it. Practical advice
* optional
204_AKB; 2; 3, en-GB
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