The “Check Injection system” is a common problem I came across from many different Renault owners coming to my workshop for repairs.
This can be caused by many different things, but In this article, I am going to discuss the most common causes and possible solutions for this problem.
What Does Renault’s “Check Injection System” Mean?
The Check injection code on a Renault is a generic fault message that indicates there is a problem with the engine management system usually related to the Fuel Injection components i.e injectors, fuel pump, etc.
In this case, it usually means that your Renault computer has detected a fault in either one or more of its sensors or components.
Now, let’s look at the main causes based on my experience.
Check Injection System Common Causes
Here are the common check injection system causes.
1. Bad MAP Sensor:
The MAP sensor is located inside the engine and monitors the air intake. It relays information to the ECU, which then uses it to control fuel injection timing.
The most common problem with this component is that it becomes disconnected from its harness or has a faulty electrical connection.
2. Faulty Exhaust Pressure Sensor (Differential Sensor):
This is another common cause for a “check injection system” message.
The exhaust pressure sensor is responsible for measuring the gas pressure between the intake and the exhaust (outtake) of the PF (Particulate Filter).
If this sensor is faulty, it will cause the ECU to think that there is a leak in the exhaust system.
When this happens, the engine control unit goes into limp mode and you will likely feel a loss of power when accelerating and the speed is limited.
3. Bad Fuel Pump:
While not a common cause, the fuel pump can also be to blame. If the fuel pump is faulty and not pumping enough pressure to inject fuel into the engine, it will trigger a warning light on your dash.
4. Dirty Fuel Injectors:
Injectors are the valves that control the amount of fuel that is injected into the engine. If these are dirty or clogged with carbon deposits, they will not be able to inject as much fuel as needed.
This can cause a drop in power and poor acceleration.
5. Bad Battery:
Another possible cause for a “check injection system” from my experience is a failing battery. A bad battery can cause a lot of electrical problems and can also lead to a loss of power.
If the battery is old, it may not be able to supply enough voltage to run your vehicle efficiently.
A way to tell if the battery in your Renault is bad and causing the issue is to see if the lights are dimming or flickering when you start your car or if other fault messages randomly pop up.
If this is happening, it’s a sign that something isn’t right with your battery.
How to Fix & Reset the “Check Injection System” on a Renault
In order to fix the problem, the first thing I advise you to do is check the map sensor and exhaust pressure sensor since they are prone to fail on Renault Cars. Here is a video that talks about how to do that.
If the sensors are good then I recommend having your Renault scanned with a diagnostic scan tool to see if there are any error codes. You can get it scanned for faults at any Renault dealership or Auto repair place.
Since this is a generic fault message, A diagnostic scan tool will be able to tell you exactly what is causing the fault.