“Check Injection System” Warning Light on a Renault [I Fixed It]

Written and Checked By:

5 minutes

Along with the message “Check Injection System,” sometimes your car also goes into limp mode (emergency program).

This warning does not allow the car to drive faster than 90 km/h and reduce the acceleration speed.

The limp mode also affects other systems such as cruise control.

What Does “Check Injection System” Mean on a Renault

Check Injection System

The “Check Injection System” warning light in a Renault car means there’s a problem with the fuel injection system. This system delivers the right amount of fuel to the engine at the right time. If it’s not working well, the engine can run rough or stall.

Frankly, this warning light is obviously serious. It tells you the engine isn’t running right. If you do not want any expensive repair then It’s crucial to get the engine checked by an expert hand.


  1. Clogged Fuel Injectors
  2. Issue with Mass Airflow Sensor (MAF Sensor)
  3. Defective MAP Sensor
  4. Faulty Tubes
  5. Damaged Turbocharger

How to fix “Check Injection System” on Renault

The following methods usually fix the issue 99% of the time. Specially replace tubes and clean fuel injector.

Solution 1: Replacing Faulty Tubes

If the “Check Injection System” warning light is due to faulty tubes or hoses, the replacement process typically involves the following steps:

  1. Locate the tubes: The tubes are usually located on the back side of the engine. To access them, you may need to remove some components, such as air hoses and engine mounts.
  2. Disassemble the tubes: Loosen the clamps securing the tubes and carefully remove them from their respective connections.
  3. Replace the tubes: Install the new tubes, confirming they are properly connected and secured with clamps.
  4. Reassemble the components: Reinstall any components removed during the process, ensuring they are properly secured.
  5. Reset the fault code: Use a diagnostic tester to clear the fault code that triggered the “Check Injection System” warning light.

Solution 2: Change turbocharger

Replacing a turbocharger in a Renault vehicle is a complex procedure that requires specialized tools and expertise. It is highly recommended to seek assistance from a qualified mechanic for this task.

Solution 3: Clean the MAF (Mass Airflow Sensor) and MAP (Manifold Absolute Pressure Sensor) sensors

Cleaning the MAF (Mass Airflow Sensor) and MAP (Manifold Absolute Pressure Sensor) sensors in a Renault vehicle can be a straightforward DIY task that can resolve issues related to the “Check Injection System” warning light. Here’s a step-by-step guide:

  1. Locate the sensors: The MAF sensor is typically located in the intake air duct, while the MAP sensor is usually mounted on the intake manifold. Refer to your vehicle’s service manual for specific locations.
  2. Disconnect the sensors: Carefully disconnect the electrical connectors from the MAF and MAP sensors. You may need to use pliers or a screwdriver to release the connectors.
  3. Apply sensor cleaner: Spray the MAF and MAP sensors with the specialized sensor cleaner, ensuring thorough coverage. Allow the cleaner to dry completely.
  4. Wipe with a clean cloth: Gently wipe the sensors with a clean microfiber cloth to remove any remaining residue.
  5. Reinstall the sensors: Carefully reconnect the electrical connectors to the MAF and MAP sensors. Ensure they are securely fastened.
  6. Clear fault codes: Use a diagnostic tester to reset any fault codes that may have triggered the “Check Injection System” warning light.

Solution 4: ECU Reset

Disconnecting the battery to reset the ECU is not a recommended fix for the “Check Injection System” warning light in Renault vehicles. It might clear the light temporarily but won’t solve the underlying issue and can even cause more problems.

Here’s a simple guide to disconnect the battery for an ECU reset:

  1. Turn off the engine and remove the key.
  2. Find the battery in the engine compartment.
  3. Disconnect the negative battery terminal using a wrench.
  4. Repeat the process for the positive terminal.
  5. Wait for 20 minutes to let the ECU reset.
  6. Reconnect the positive terminal and tighten the nut.
  7. Reconnect the negative terminal.
  8. Start the engine and drive a few miles to check if the warning light goes off.

Solution 5: Clean fuel injectors

Cleaning fuel injectors in a Renault vehicle can be a complex task that may require specialized tools and expertise. While some methods involve using fuel additives or injector cleaning solutions, it is important to note that these methods may not be as effective as professional cleaning services.

Fuel Injector Cleaning Methods:

  • Fuel Additives: Some fuel additives claim to clean fuel injectors by removing deposits and improving fuel efficiency. However, the effectiveness of these additives can vary depending on the severity of the injector clogging and the specific product used.
  • Injector Cleaning Solutions: Injector cleaning solutions are typically poured into the fuel tank and are designed to dissolve deposits and clean the injectors as fuel passes through them. While these solutions may provide some improvement, they may not be as effective as professional cleaning services.

Solution 6: Fix a clogged DPF (Diesel Particulate Filter)

A clogged DPF (Diesel Particulate Filter) can trigger the “Check Injection System” warning light in Renault vehicles. Here’s how to address this issue:

To fix a clogged DPF (Diesel Particulate Filter) in a Renault vehicle, consider these options:

  1. Passive Regeneration: Drive on a highway for at least 30 minutes at a constant speed of around 3000 RPM. This high-speed driving helps burn off accumulated soot particles.
  2. Active Regeneration: A qualified mechanic can initiate a forced regeneration using diagnostic tools to raise the engine temperature and burn off soot particles.
  3. Chemical Cleaning: For severely clogged DPFs, chemical cleaning may be necessary. A mechanic will remove the DPF and clean it with specialized chemicals.

⚠️ Frequent Dashboard Warning Message on Renault:
Easy Fix “Braking System Fault” on Renault

One response to ““Check Injection System” Warning Light on a Renault [I Fixed It]”

  1. Rasto Avatar

    Thanks for explanations about injection system. I visited 3 different Renault services for at first: checking the fault. Each of them gave me different reason with different prices from 200 to 5.000 EUR.
    According to your text I have intention woth my own investigation: 1) measuring the byttery voltage at the higest currebt consumtiom. 2) changing the motor air filter. 3) MAF.
    My Scenic II has passed 254.000 km, Therefore the expencive rang is important too.

Leave a Reply

Your email address will not be published. Required fields are marked *