2010.5 Citroen DS4 check engine

Changing the coolant
The coolant does not have to be changed.
Coolant specifi cation
The coolant must conform to the manufacturer's recommendations.
Coolant level
The coolant level should be close to the "MA X" mark but should never exceed it. When the engine is warm, the temperature of the coolant is regulated by the fan. This can operate with the ignition off. On vehicles which are fitted with a par ticle
emission filter, the fan may operate after the vehicle has been switched off, even if the engine is cold.
In addition, as the cooling system is pressurised, wait at least one hour after switching off the engine before carrying out any work. To avoid any risk of scalding, unscrew the cap by two turns to allow the pressure to drop. When the pressure has dropped, remove the cap and top up the level.
Power steering fluid level
The power steering fluid level should be close to the "MA X" mark. Unscrew the cap, with the engine cold, to check the level.
To check the level or top up the fluid, immobilise the vehicle and switch of the engine.
Screenwash/headlamp
wash level

Checks
Battery Air filter and passenger compartment filter
Oil filter
Unless other wise indicated, check these components in accordance with the Maintenance and Warranty Guide and according to your engine. Other wise, have them checked by a CITROËN dealer or a qualified workshop.
The battery does not require any maintenance. However, check that the terminals are clean and correctly tightened, par ticularly in summer and winter. When carrying out work on the battery, refer to the "Practical information" section for details of the precautions to be taken before disconnecting the battery and following its reconnection.
Refer to the Maintenance and Warranty Guide for details of the replacement inter vals for these components. Depending on the environment (e.g. dusty atmosphere) and the use of the vehicle (e.g. city driving), replace them twice as often if necessar y (refer to the "Engines" section). A clogged passenger compar tment filter may have an adverse effect on the per formance of the air conditioning system and generate undesirable odours.
Replace the oil filter each time the engine oil is changed.
Refer to the Maintenance and Warranty Guide for details of the replacement inter val for this component.
The presence of this label, in par ticular with the Stop & Star t system, indicates the use of a specific 12 V lead-acid battery with special technology and specification, for which the involvement of a CITROËN dealer or a qualified workshop is required when replacing or
disconnecting the battery. Failure to obser ve this recommendation may shor ten the life of the battery.

Electric parking brake
This system does not require any routine ser vicing. However, in the event of a problem, have the system checked by a CITROËN dealer or a qualified workshop. For more information, see "Driving - Electric parking brake - § Operating faults".
Only use products recommended by CITROËN or products of equivalent quality and specification. In order to optimise the operation of units as impor tant as the braking system, CITROËN selects and offers very specific products. To avoid damaging the electrical units, the use of a high pressure washer in the engine compar tment is strictly prohibited . Brake disc wear
For information on checking brake disc wear, contact a CITROËN dealer or a qualified workshop.
Manual parking brake
If a loss of effectiveness of this system is noticed, the parking brake must be checked, even between two ser vices. Checking this system must be done by a CITROËN dealer or a qualified workshop.
Brake pads
Brake wear depends on the style of driving, par ticularly in the case of vehicles used in town, over shor t distances. It may be necessary to have the condition of the brakes checked, even between vehicle ser vices. Unless there is a leak in the system, a drop in the brake fluid level indicates that the brake pads are worn.

239Practical information
1. Sealing
 Uncoil the white pipe G fully.  Unscrew the cap from the white pipe.
 Connect the white pipe to the valve of the tyre to be repaired.
Repair procedure
Avoid removing any foreign bodies which have penetrated into the tyre.
 Connect the compressor's electric plug to the vehicle's 12 V socket.
 Star t the vehicle and leave the engine running.
 Switch off the ignition.  Turn the selector A to the "sealant"
position.  Check that the switch B is in position "O" .
Take care, this product is harmful (e.g. ethylene-glycol, colophony...) if swallowed and causes irritation to the eyes. Keep it out of reach of children.

Removing the cartridge
 Stow the black pipe.  Detach the angled base from the white pipe.  Suppor t the compressor ver tically.  Unscrew the car tridge from the bottom.
Checking tyre pressures/
inflating accessories
Beware of discharges of fluid. The expiry date of the fluid is indicated
on the car tridge. The sealant car tridge is designed for single use; even if only par tly used, it must be replaced. After use, do not discard the cartridge into the environment, take it to an authorised waste disposal site or a CITROËN dealer. Do not forget to obtain a new sealant car tridge, available from CITROËN dealers or from a qualified workshop.
You can also use the compressor, without injecting any product, to: - check or adjust the pressureof your tyres, - inflate other accessories (balls, bicycle tyres...).
 Connect the compressor's electrical connector to the vehicle's 12 V socket.  Star t the vehicle and let the engine run.  Adjust the pressure using the compressor (to inflate: switch B in position "I" ; to deflate: switch B in position "O" and press button C ), according to the vehicle's tyre
pressure label or the accessory's pressure label.  Remove the kit then stow it.
 Turn the selector A to the "Air" position.  Uncoil the black pipe H fully.  Connect the black pipe to the valve of the wheel or accessory. If necessary, fit one of the adaptors supplied with the kit first.

 Connect the red cable to the positive terminal (+) of the flat battery A , then to the positive terminal (+) of the slave battery B .  Connect one end of the green or black cable to the negative terminal (-) of the slave battery B .  Connect the other end of the green or black cable to the ear th point C on the broken down vehicle.
 Operate the star ter, let the engine run.  Wait until the engine returns to idle and disconnect the cables.
Charging the battery using
a battery charger
The batteries contain harmful substances such as sulphuric acid and lead. They must be disposed of in accordance with regulations and must not, in any circumstances, be discarded with household waste. Take used remote control batteries and vehicle batteries to a special collection point.
 Disconnect the battery from the vehicle.  Follow the instructions for use provided by the manufacturer of the charger. Reconnect starting with the negative terminal (-). Check that the terminals and connectors are clean. If they are covered with sulphate (whitish or greenish deposit), remove them and clean them.
The Stop & Star t battery does not have to be disconnected for charging.
It is advisable to disconnect the battery if the vehicle is to be left unused for
more than one month.
Starting using another
battery

271Practical information
The rear parking sensors will be deactivated automatically if a genuine
CITROËN towbar is used.
Driving advice
Distribution of loads
 Distribute the load in the trailer so that the heaviest items are as close as possible to the axle and the nose weight approaches the maximum permitted without exceeding it. Air density decreases with altitude, thus reducing engine per formance. Above 1 000 metres, the maximum towed load must be reduced by 10 % for every 1 000 metres of altitude. Refer to the "Technical Data" section for details of the weights and towed loads which apply to your vehicle.
Side wind
 Take into account the increased sensitivity to side wind.
Cooling
Towing a trailer on a slope increases the temperature of the coolant. As the fan is electrically controlled, its cooling capacity is not dependent on the engine speed.  To lower the engine speed, reduce your speed. The maximum towed load on a long incline depends on the gradient and the ambient temperature. In all cases, keep a check on the coolant temperature.
Braking
Towing a trailer increases the braking distance.
Tyres
 Check the tyre pressures of the towing vehicle and of the trailer, obser ving the recommended pressures.
Lighting
 Check the electrical lighting and signalling on the trailer.
 If the warning lamp and the STOP warning lamp come on, stop the vehicle and switch off
the engine as soon as possible.

281Technical data

Identifi cation markings
Various visible markings for the identification of yo ur vehicle.
A. Vehicle identification number (VIN) under the bonnet. This number is engraved on the bodywork near the engine mounting.
B. Vehicle identification number on the dashboard. This number is indicated on a self-adhesive label which is visible through the windscreen.
D. Tyre/paint label. This label is affixed to the driver's front pillar.
Wheels which are fitted with 225/40 R18 tyres cannot be fitted with snow chains. For more information, contact a CITROËN dealer or a qualified workshop.
Low tyre pressures increase fuel consumption.
The tyre pressures must be checked
when the tyres are cold, at least once a month.
C. Manufacturer's label. The VIN is indicated on a self-destroying label affixed to the driver's centre pillar.
It bears the following information: - the tyre pressures, for unladen and laden conditions, - the wheel rim and tyre sizes, - the brands of tyre recommended by the manufacturer, - the spare tyre inflation pressure, - the paint colour code.