The 'check injection' message and 'check anti pollution system' warning on your Renault signal an injection fault or emissions problem. Common on Clio, Mégane, Captur, Scénic, and Kadjar models, these alerts appear with the antipollution warning light—an orange engine symbol. Understanding these renault injection faults helps you take quick action.
Affected models: Renault Clio, Mégane, Captur, Scénic, Kadjar, Talisman, Koleos
These injection warning lights are often accompanied by the check engine light on Renault vehicles. Whether you're driving a Renault Clio with check injection problems, a Mégane with anti pollution system fault, or a Captur displaying the check injection warning, the underlying causes are often similar.
Are you looking for a car scanner ?
- My model is not in the list
I don't have any lights on
How should you react when the check injection message appears?
When the check injection warning or anti pollution system fault appears on your Renault, your response depends on the vehicle's behaviour.
- If the engine runs normally without power loss, you can drive cautiously to a garage. However, don't delay diagnosis—injection faults on Renault can worsen quickly and lead to more expensive repairs.
- If you experience jerking, significant power loss, or irregular engine running, stop the vehicle immediately. These symptoms indicate serious problems with fuel injectors, the Diesel Particulate Filter (DPF), or the injection system requiring urgent attention.
- On Renault Kadjar diesel versions, DPF faults and EGR valve issues frequently cause the check anti pollution system message. If the vehicle operates normally, proceed to a garage, but any power loss warrants immediate attention.
Important: On Renault Scénic and Mégane models, the check injection warning combined with limp mode (reduced power) indicates a serious injection fault that requires immediate professional diagnosis.
Most common causes of check injection and anti pollution faults
The check injection message and anti pollution system fault appear when the Engine Control Unit (ECU) detects problems affecting combustion or emission control. Here are the primary causes of these renault injection faults.
Injection system problems and faulty injectors
Fuel injectors deliver precise amounts of fuel into the cylinders. When one or more injectors become clogged or fail, combustion becomes irregular. This triggers the check injection warning and may illuminate the anti pollution warning light.
Injection faults are particularly common on Renault Clio and Mégane diesel engines. Symptoms include rough idling, difficult starting, and black smoke from the exhaust.
Cleaning or replacing faulty injectors resolves most injection problems. An OBD-II diagnostic scan identifies which injector is causing the check injection fault on your Renault.
Clogged EGR valve causing pollution system faults
The EGR (Exhaust Gas Recirculation) valve reduces emissions by recirculating exhaust gases back into the engine. It frequently clogs on Renault vehicles, especially with short journeys or city driving.
A blocked EGR valve triggers the check antipollution system message on Renault Scénic, Clio, and Captur models. This EGR valve fault causes poor engine performance and increased fuel consumption.
Diesel Particulate Filter (DPF) faults
On diesel models including Mégane, Kadjar, and Captur, the DPF captures harmful particles from exhaust gases. When the DPF becomes clogged, it cannot regenerate properly.
A DPF fault causes the check anti pollution system warning and the anti pollution warning light. The engine may enter limp mode, restricting power to prevent further damage.
Faulty sensors triggering false warnings
Sensors monitor various engine parameters. The fuel pressure sensor, exhaust gas temperature sensor, and oxygen sensors can malfunction and send incorrect data to the ECU.
These sensor faults cause the check injection message or antipollution system fault to appear, even when the actual injection system and emissions components function correctly.
Are you looking for a car scanner ?
How to diagnose check injection and anti pollution faults
Use an OBD2 diagnostic scanner for accurate diagnosis
Renault vehicles feature OBD2 diagnostic compatibility, allowing connection of a diagnostic scanner to read fault codes. These codes pinpoint the specific component causing the check injection or anti pollution warning.
Common fault codes for renault injection problems include P0087 (fuel rail pressure too low), P0401 (EGR flow insufficient), and P2002 (DPF efficiency below threshold).
Using a klavkarr OBD2 scanner, you can read fault codes yourself and understand why the check injection warning appeared on your Renault Clio, Mégane, or Captur.
Consult a professional mechanic or Renault specialist
If you lack diagnostic equipment or cannot interpret the results, consult a professional. A Renault specialist can accurately diagnose injection faults and anti pollution system problems.
Professional diagnosis is essential for complex issues like high-pressure fuel pump failure or electronic injection system faults that require specialized equipment.
How to reset the check injection and anti pollution warning lights
After repairing the underlying cause of the check injection fault or anti pollution system fault, you need to reset the warning lights on your Renault.
Reset injection warning light using an OBD-II diagnostic scanner
The most reliable method to turn off the check injection warning is using an OBD-II scanner. This tool reads and clears fault codes once you've resolved the problem.
Connect the scanner to your Renault's OBD port, clear the error codes related to the injection system or emissions, then restart the vehicle. The check injection message and anti pollution warning light should disappear.
Disconnect the battery to reset warning lights
Without a diagnostic scanner, disconnecting your Renault's battery for 10–15 minutes may reset the system. This can turn off the check injection warning light temporarily.
However, this method doesn't guarantee the injection fault is fixed. The check injection message will return if the underlying problem persists.
Are you looking for a car scanner ?
Allow the system to self-reset after repairs
For minor issues like temporary sensor glitches, the check injection warning may disappear automatically. After several driving cycles, the ECU confirms everything functions correctly and turns off the warning lights.
If the check injection or anti pollution system fault warning returns repeatedly, this indicates a persistent problem requiring professional diagnosis.
Frequently asked questions about check injection on Renault
What does "check injection" mean on my Renault?
The check injection message indicates a fault detected in your Renault's fuel injection system. This can involve faulty injectors, fuel pressure problems, or sensor issues affecting how fuel is delivered to the engine.
Can I drive with the check injection message displayed?
You can drive cautiously to a garage if the engine runs normally. However, if you experience power loss, jerking, or rough running, stop immediately as driving with a serious injection fault can cause expensive engine damage.
How do I reset the check injection warning light?
Use an OBD-II diagnostic scanner to clear fault codes after repairing the problem. Alternatively, disconnect the battery for 10-15 minutes, though this only works if you've fixed the underlying injection fault.
Why does the anti pollution system fault appear on Renault?
The anti pollution system fault typically indicates problems with emissions control components like the DPF, EGR valve, or oxygen sensors. These issues prevent your Renault from meeting emission standards and trigger the warning light.