Oil warning light on: what to do, causes and affected cars
By Rédaction Quelle Occasion · updated on 30 October 2026
The red oil warning light (the oil can) comes on when oil pressure falls below a minimum: engine lubrication is then no longer guaranteed. If it comes on suddenly while driving, switch the engine off immediately: a few hundred more metres can be enough to destroy a big-end bearing (Caradisiac).
What to do when the oil light comes on
- Stop as soon as possible and switch off the engine.
- Wait a few minutes, then check the level on the dipstick.
- Do not restart if the level is correct but the light stays on: pressure is missing for another reason. Have the car towed.
Causes of low oil pressure
A low oil level
The simplest cause, often linked to an engine that burns oil.
An oil pickup blocked by a "wet" belt
On the 1.2 PureTech, the timing belt runs in oil and can break up: its debris blocks the oil pickup, pressure drops and the engine can be destroyed. Stellantis extended the belt warranty to 10 years or 175,000 km, subject to servicing conditions (Caradisiac; Test-Achats). Ford's 1.0 EcoBoost has the same risk: a Fiesta owner reports a belt that blocked the pickup at 140,000 km (Fiches-auto; CarVerif).
A clogged pickup or failing oil pump
On the Bentley Continental GT, oil pickup strainers clog and make the pressure drop (CarVerif).
A faulty pressure sensor
Sometimes the sensor is wrong. On the 2011-2012 Kia Rio, a fragile sensor turns on the red light when hot with no real fault, at around 45,000 km on average; it costs about €180 (CarVerif). Only a garage can confirm this by measuring the real pressure: do not drive on, betting on a false warning.
Before buying a used car
Turn down any car whose oil or engine light comes on (CarVerif, Nissan Micra V; CarVerif, Mazda CX-5). On a PureTech or 1.0 EcoBoost, ask for the belt replacement invoice.
Cars where low oil pressure is documented
In our guides, these models have a sourced fault linked to oil pressure:
- Alfa Romeo Stelvio I : 2.2 diesel: oil seepage, oil pressure and turbo
- Audi A5 I
- Bentley Continental GT I
- Citroën C3 Aircross I : Degraded 'wet' timing belt (1.2 PureTech)
- Citroën C3 III : Degraded 'wet' timing belt (1.2 PureTech)
- Citroën C4 Cactus I : Degraded 'wet' timing belt (1.2 PureTech)
- Citroën C4 III : Degraded 'wet' timing belt (1.2 PureTech)
- Citroën C4 Picasso II : Degraded 'wet' timing belt (1.2 PureTech)
- Citroën C5 Aircross I : Degraded 'wet' timing belt (1.2 PureTech)
- Dacia Duster II
- DS DS 3 Crossback I (devenue DS 3 en 2023) : Degradation of the 'wet' timing belt (1.2 PureTech)
- DS DS 7 Crossback / DS 7 I (2017-) : 'Wet' timing belt degradation (1.2 PureTech)
- Fiat 500X I : MultiAir hydraulic module and turbo (1.4 MultiAir)
- Ford C-Max II
- Ford Fiesta VII : Wet belt of the 1.0 EcoBoost
- Kia Rio III
- Land Rover Defender I : Oil pump gear bolt on the Td5
- Land Rover Range Rover Sport II : Crankshaft failure / big-end bearings (V6 diesel)
- Nissan 370Z Z34
- Opel Astra L
- Opel Combo Life E : Degraded “wet” timing belt (1.2 PureTech)
- Opel Corsa F : Degraded “wet” timing belt (1.2 PureTech)
- Opel Crossland X I : Degraded “wet” timing belt (1.2 PureTech)
- Opel Grandland X / Grandland I : Degraded “wet” timing belt (1.2 PureTech)
- Opel Mokka II : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 2008 I : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 2008 II : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 208 II : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 3008 II : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 308 II : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 308 III : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 5008 II : Degraded “wet” timing belt (1.2 PureTech)
- Peugeot 508 II : Degraded “wet” timing belt (1.2 PureTech)
- Renault Clio IV : Oil overconsumption and engine failure on the 1.2 TCe 120
- Subaru BRZ II (ZD) : Oil pressure drop in the FA24 engine on track
- Toyota Proace City Verso I : Deterioration of the "wet" timing belt (1.2 PureTech)
- TVR Tuscan Speed Six
See also: oil consumption, should you avoid the PureTech? and engine knocking.
Sources
- Alerte : le tableau de bord clignote — caradisiac.com
- Caradisiac — caradisiac.com
- Test-Achats — test-achats.be
- Fiches-auto — fiches-auto.fr
- Ford Fiesta Mk7/Mk8 : fiabilité et points à vérifier — carverif.fr
- Fiabilité Bentley Continental GT Essence 6.0 W12 (lecture complète, 2026-10-21) — carverif.fr
- Kia Rio (UB) Essence 1.2 : Performances et Confort Optimaux — carverif.fr
- Nissan Micra V K14 fiabilité : les points à vérifier — carverif.fr
- Mazda CX-5 II 2.2 Skyactiv-D 150 : fiabilité, problèmes connus et conseils d'achat — carverif.fr
Before you buy: check and equip
Check the history
Before paying, check the administrative status (lien, objection, declared claims) and the mileage recorded at the roadworthiness test.
Read fault codes
An OBD scanner plugged in under the steering wheel shows stored fault codes, even with warning lights off: useful during the test drive.
Parts and maintenance
Compare prices of car parts (timing, brakes, filters) to estimate the repairs to plan for.
Insure the car
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