Citroen C4 airbag warning light - indicates a problem within the airbag system and needs to be checked out ASAP. You should use a diagnostic tool which covers the airbag system such as the iCarsoft i970 Citroen OBD Code Reader. The kits will tell you where within the airbag system the fault is occuring, and also allow you to clear the dashboard airbag light.

Citroen C4 ABS Dash Light - indicates a problem within the ABS or Anti Lock Braking System. You need to hook this upto a diagnostic kit that covers the ABS module such as the iCarsoft i970 Citroen OBD Code Reader. It could be that an ABS sensor needs to be replaced - if this is the case you should visit www.bavariandominator.co.uk for your ABS sensors

Citroen C4 SERVICE warning light - With the engine running, the lighting of this warning lamp along with a message on the instrument panel screen, the lighting of the SERVICE warning lamp and a sound signal, indicates a system fault.  This warning lamp remains on only for a short time for faults that are minor.

Citroen C4 AUTO wipers dash light - indicates that the automatic front wipers have been activated.

Citroen C4 open door warning light - indicates that a door is open - please check all doors.

Citroen C4 handbrake & ABS dash warning lights together - indicates a fault within the braking system. It could mean that the brake fluid needs to be topped up, check that first, if that is not the cause you can use the iCarsoft i970 Citroen OBD Code Reader which will diagnose the fault and help you to correct the problem and remove the citroen ABS light.

Citroen C4 power steering warning light - indicates that there is a fault within your power steering system. You will need to take it to the Citroen dealership or you can use the iCarsoft i970 Citroen OBD Code Reader kit yourself to diagnose & repair the fault within the power steering system.

Citroen C4 ESP or traction control warning light - this warning light will illuminate when it detects a change in the road surface that will cause the vehicle to have less traction, normally in ice or snow. The light will flash when active, if the light is on coninious you will need to get it checked out as it indicates a fault within the ESP module. You can either take it to a Citroen dealer to deal with or you can diagnose & repair yourself, we would advise you to use the iCarsoft i970 Citroen OBD Code Reader kit which will pin point the problem.

Citroen C4 brake pedal warning light for automatic vehicles - indicates that you are trying to start the engine but you have not depressed the brake pedal - you must press the brake pedal in order to start automatic engines.

Citroen C4 passenger airbag warning light - Turn the control switch to the " OFF " position to deactivate the front passenger's airbag. In this case you can install a rear-facing child seat.
The passenger's airbag system is automatically put into service on starting the vehicle ("ON " position).

Citroen C4 handbrake warning light - indicates that the handbrake is not applied correctly. Check your handbrake is fully applied, the light will go out when the handbrake is fully released.

Citroen C4 blue coolant dash light - indicates that your engine is cold. Avoid driving harshly or rough until at least this light has dissapeared from the dashboard.

Citroen C4 battery warning light - if illuminated it indicates that the battery is not being charged. You should contact your Citroen or independant workshop. 

Citroen C4 traction control warning light - If either of the ESP or ASR systems is active, the warning lamp flashes.

With the engine running, the lighting of this warning lamp along with a message on the instrument panel screen, the lighting of the SERVI CE warning lamp and a sound signal, indicates a system fault.

Citroen C4 STOP warning light - When the warning lamp comes on, you must stop the vehicle and switch off the engine. Contact a CITROEN dealer or you can diagnose the fault yourself by using the iCarsoft i970 Citroen OBD Code Reader

Citroen C4 pre heating warning light - illuminates when temperatures are cold for diesel cars only. 

Citroen C4 fuel warning light - indicates that your fuel level are low, fill up as soon as possible. 

Citroen C4 coolant dash light - It comes on for a few seconds each time you switch on the ignition. If this warning lamp comes on, engine running, it tells you that the coolant temperature is rising abnormally.
This warning lamp is linked with the STOP warning lamp. It is essential to stop the vehicle. Check the coolant level. If the level is too low, contact a CITROEN dealer.