DS warning lights: what each light means
In DS models, the documented faults light up 8 warning lights on the dashboard. The most frequent: engine warning light (14 faults), adBlue warning (3 faults) and pollution control faulty (3 faults). Overheating and oil warning light call for stopping as soon as possible.
Which warning lights the faults of DS trigger
Red ones first, and those that call for stopping. Below each warning light, the documented faults that trigger it, with their pages.
Overheating or temperature warning light
Urgency: As soon as possibleRedSymbol: thermometer over wavy lines (coolant)
The temperature needle climbs towards the red zone or the coolant warning light comes on. It usually points to a lack of coolant, a leak, or a failing thermostat or water pump. Driving on can warp the cylinder head or damage the gasket.
What to do: Stop as soon as you can and switch the engine off. Do not open the coolant reservoir cap while it is hot. If coolant is missing, do not set off again until you have found the leak.
2 documented faults that trigger it in the DS
- High severity: Fragile water pump and heat exchanger · 1.6 THP engine · DS 3 and DS 4 I
- High severity: Fragile water pump (and expansion tank or heat exchanger, depending on displacement) · 1.4/1.6 VTi engine · DS 3
Oil pressure warning light on
Urgency: As soon as possibleRedSymbol: oil can (an oil can with a drop)
The red oil-can warning light means the engine is not getting the oil pressure it needs. The cause may be a low oil level, a failing oil pump or a blocked oil circuit. With low pressure, parts such as the turbo, the bearings or the timing drive can wear out within minutes.
What to do: Stop the car as soon as it is safe and switch the engine off. Check the level with the dipstick and do not drive on if the light stays on: call a recovery truck.
1 documented fault that triggers it in the DS
- Critical severity: Oil-bath timing belt degradation · 1.2 PureTech engine · DS 3, DS 3 Crossback, DS 4 I and 1 more
Airbag warning light on
Urgency: Garage soonRedSymbol: a seated person wearing a seat belt with a circle (the inflated airbag) in front; in some cars, the letters SRS or AIRBAG
The airbag warning light means the system has detected a fault and an airbag or seatbelt pretensioner may not deploy in a crash. Causes range from a connector under the seat to the control unit or the airbag itself.
What to do: Have it diagnosed as soon as possible and check with the VIN whether the car has any outstanding airbag recall.
1 documented fault that triggers it in the DS
- Critical severity: Incorrect or poorly secured airbag parts in two campaigns (2017-2018 and 2021) · outside the engine · DS 7 Crossback
Electric parking brake warning
Urgency: Garage soonRedSymbol: letter P inside a circle in brackets, sometimes with an exclamation mark
Cars with an electric parking brake show a warning light or message when the caliper motor, its wiring or the control unit fails. The brake may not release or may not apply.
What to do: Do not rely on the handbrake if the warning appears: park on level ground and leave the car in gear. Have the system diagnosed.
1 documented fault that triggers it in the DS
- Medium severity: Electric parking brake fault · outside the engine · DS 4 I
Engine fault warning light (check engine)
Urgency: Garage soonYellow or amberSymbol: outline of an engine seen from the side, in yellow or orange
The orange engine-shaped warning light comes on when the ECU detects a fault affecting combustion or emissions. If it flashes, it usually points to misfires that can damage the catalytic converter.
What to do: If it stays on steadily, you can drive gently to a garage and ask for a fault code read-out. If it flashes or you notice a loss of power, slow down and get to a garage as soon as possible.
14 documented faults that trigger it in the DS
- Critical severity: Oil-bath timing belt degradation · 1.2 PureTech engine · DS 3, DS 3 Crossback, DS 4 I and 1 more
- Critical severity: Wear and breakage of the 7 mm chain between the camshafts · 1.5 BlueHDi engine · DS 3 Crossback, DS 4 II and DS 7 Crossback
- Critical severity: Timing chain and tensioner stretch (turbo versions, before 2012) · 1.6 THP engine · DS 3 and DS 4 I
- Critical severity: Wear of the timing chain and tensioner · 1.4/1.6 VTi engine · DS 3
- Medium severity: AdBlue tank and pump failure · 1.5 BlueHDi engine · DS 3 Crossback and DS 7 Crossback
- Medium severity: AdBlue (SCR) tank and pump failure · 2.0 BlueHDi engine · DS 7 Crossback
And 8 more faults on the linked pages.
AdBlue system warning
Urgency: Garage soonYellow or amberSymbol: AdBlue system warning in the instrument cluster, yellow or orange at first, usually accompanied by a text message and, later on, a countdown in kilometres
Diesels with selective catalytic reduction (SCR) use AdBlue to cut NOx emissions. A warning with a countdown ("engine will not restart in X km") indicates a low level or a fault in the AdBlue tank, pump, heater or injector. When the countdown reaches zero, the car will not start again.
What to do: If the tank is full and the warning persists, the problem lies with the system. Go to a garage before the countdown ends and keep your receipts in case the fault is covered by a manufacturer campaign.
3 documented faults that trigger it in the DS
- Medium severity: AdBlue tank and pump fault (1.6 BlueHDi) · 1.6 HDi engine · DS 3, DS 4 I and DS 5
- Medium severity: AdBlue tank and pump failure · 1.5 BlueHDi engine · DS 3 Crossback and DS 7 Crossback
- Medium severity: AdBlue (SCR) tank and pump failure · 2.0 BlueHDi engine · DS 7 Crossback
"Pollution control system faulty" message
Urgency: Garage soonYellow or amberSymbol: a text message on the dashboard ("anticontaminación defectuosa" or similar wording, in English "emissions system fault"), sometimes alongside an amber warning light
A common message on Peugeot, Citroën, DS and Opel cars from the Stellantis group. It appears when the ECU detects a fault in a component that controls emissions: the particulate filter, the EGR valve, the sensors, the AdBlue system or, on petrol engines, combustion problems.
What to do: It is not a specific fault but a generic warning. Have the car diagnosed with the right equipment to read the exact code before replacing any part.
3 documented faults that trigger it in the DS
- Medium severity: AdBlue tank and pump fault (1.6 BlueHDi) · 1.6 HDi engine · DS 3, DS 4 I and DS 5
- High severity: DPF clogging on short journeys · 2.0 BlueHDi engine · DS 7 Crossback
- Medium severity: Additive-fed particulate filter (Eolys cerine): depleted additive and clogging · 1.6 HDi engine · DS 3, DS 4 I and DS 5
Particulate filter warning light (DPF)
Urgency: Garage soonYellow or amberSymbol: particulate filter symbol on the dashboard, normally amber; its design varies by manufacturer
On modern diesels it means the particulate filter is clogged with soot and has not been able to regenerate. It is common in cars used mostly for short town journeys, although it can also be caused by a sensor or by an injection or EGR fault.
What to do: If the handbook allows it, a 20-minute drive on a motorway at a steady speed can complete the regeneration. If the light stays on or you lose power, go to a garage.
2 documented faults that trigger it in the DS
- High severity: DPF clogging on short journeys · 2.0 BlueHDi engine · DS 7 Crossback
- Medium severity: Additive-fed particulate filter (Eolys cerine): depleted additive and clogging · 1.6 HDi engine · DS 3, DS 4 I and DS 5
Frequently asked questions
Which warning lights come on most in the DS?
Engine warning light: 14 documented faults, such as oil-bath timing belt degradation. AdBlue warning: 3 documented faults, such as adBlue tank and pump fault (1.6 BlueHDi). Pollution control faulty: 3 documented faults, such as adBlue tank and pump fault (1.6 BlueHDi).
Which warning light of DS is the most serious?
Overheating and oil warning light: its urgency is “as soon as possible”. Stop the car as soon as it is safe; on each warning light's page, at the top, you will find what to do.
Which DS models have the most faults that trigger warning lights?
DS DS 3 (14 faults), DS DS 4 I (13 faults), DS DS 7 Crossback (12 faults) and DS DS 3 Crossback (5 faults).
A warning light has come on in the DS: what should I do?
Find which warning light it is on this page and check its urgency. With overheating and oil warning light, stop as soon as possible somewhere safe. For the others, book an appointment at a garage and have them read the fault code with an OBD reader: it shows which system has failed.