Illuminated Peugeot check engine light means that something is wrong with your Peugeot engine or emission system. This problem is often caused by a faulty spark plug, ignition coil, mass air flow sensor, oxygen sensor or a loose gas cap.
In addition to the Peugeot check engine light staying on, on newer models, you will get Engine management system fault message displays on the dashboard.
Pay attention to how your engine is running. Below is a list of possible symptoms that you may notice.
- rough idle,
- engine judder under acceleration or lack of power.
- Peugeot check engine light on and the car won't start
- Car won't accelerate
- Peugo check engine light flashing
The BC display may also show messages regarding the engine operation. You can use an OBD2 scanner to diagnose your Peugeot check engine light via the OBD port under the dashboard. All 2000 and newer Peugeots have an On-Board Diagnostic (OBD) computer.
Peugeot Check Engine Light Meaning
Here are some of the usual combinations.
- Flashing ‘check engine’ light with ‘Catalytic Converter Fault’ message displayed on the BC. Engine shakes and runs rough. This is a definitive sign of a misfire. It can be caused by bad spark plugs or faulty ignition coils. You should not drive the car as this will cause damage to the catalytic converter.
- Constant ‘check engine’ light - Engine is running fine. In most cases, this is caused by emission control system issues. it will probably be either faulty O2 sensors or worn-out catalytic converter. It can also be caused by a loose gas cap.
- Constant ‘check engine’ light with ‘Depollution system faulty’ message is displayed on the BC. The engine is running rough. Now, this is a tricky one. Scan for codes and you will probably get a P0300 and P1340 code. This is described as ‘severe misfire on cylinder 1, 2, 3 or 4’. This is misleading, as the usual problem is with one of the camshaft position sensors. Further diagnostic by a mechanic is required.
- Constant ‘check engine’ light with ‘Engine fault: repair needed’ message is displayed on the BC. The engine is running fine. This can be a sign of boost or fuel pressure system related problem.
- Constant ‘check engine’ light with ‘Engine fault: repair needed’ message is displayed on the BC. If the engine has a very rough idle, a high-pressure fuel pump is often a common cause. If it idles fine but has a lack of power and poor acceleration, there is a large boost leak or you could have a clogged catalytic converter.
Modern THP engines have a high-pressure fuel injection system, turbocharger, variable valve timing, and variable valve lift. These are some of the things that you need to take into consideration when looking into Peugeot engine management light problems.
- Ignition Coil - Broken ignition coil pack assembly will cause a misfire and a flashing ‘check engine’ light. Older Peugeots equipped with non-turbo four-cylinder engines are more prone to this problem.
- Camshaft Position Sensor - Faulty camshaft position sensors on VVT and THP engines usually cause a misfire.
- Variable Valve System - Newer engines are equipped with a variable valve lift system. The electric stepper motor or eccentric shaft position sensor are usual failure points. This can cause poor throttle response or even a non-starting engine.
- Fuel Pump - High-pressure fuel pump on newer, turbocharged THP engines can fail. It will cause a very rough idle.
- Turbo - Turbocharged THP engines have a recirculation valve between turbocharger and intercooler. It can suffer from a broken membrane. This will cause a boost leak and a noticeable power loss.
- Fuel Quality - Diesel HDI are very sensitive to fuel quality. Low-quality diesel fuel can damage fuel pump or injectors. Fuel filter must be replaced in regular intervals. Diesel injection faults will cause driveability issues under hard load (i.e. driving uphill).
- EGR Valve - Diesel HDI engines can suffer from faulty EGR valve. Rough idle, engine pinging or smoke from the exhaust are some of the symptoms. In addition, DPF exhaust filter can get blocked over the time.
Whatever the combination, you will need a code reader or a scan tool to get a better insight into the problem. Without it, you can only guess the source of the problem. This hit-and-miss method might end up as a wild goose chase.
How to read codes
- Plug your OBD2 Scanner into the OBD2 port. In most Peugeot vehicles it is in the driver's side footwell, under the steering wheel. However, there are models that have OBD2 ports located in some unusual places. In Peugeot 407 or 607, look in the armrest compartment. In Peugeot 307, 308 or RCZ, there is a small matt covered slot in at the bottom of the central console, in front of the gearbox lever. Remove this matt to reveal the port. In 508, take out the ashtray that is located in front of the gearbox lever.
- Turn the ignition ON so that your dashboard illuminates, but don’t start the engine.
- Allow your OBD2 scanner to turn on. Press Enter then Read Codes.
- Write down the codes and do online research on what each code means and possible causes.
Peugeot Engine Management Light Reset
To reset Peugeot engine management light, first, you must fix the problem that triggered the fault codes.
Next use an OBD-II scanner to clear the fault codes via the OBD-II port under the dashboard.
- Connect an OBD2 scanner into the port under the dashboard.
- Turn on the ignition.
- Press enter on your scanner. Scroll down to Erase Codes. Press enter.
- Turn the ignition off and wait for several seconds
- Turn the engine on and check if the ‘Check engine’ light will appear again.
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