Exhaust Renault Kadjar (2015-2022)

Owners of the Renault Kadjar often report exhaust system issues including faulty valves/flaps, black smoke, unusual smells, abnormal noises such as clattering or buzzing, rust, and failures related to gas treatment components like NOx sensors and DPF. These problems mainly affect petrol models from 2019 and diesel versions such as the Energy dCi 130 and 4x4 models.

Typical signs include:

• Black smoke and power loss indicating rich fuel combustion potentially caused by clogged injectors, dirty air filter, or faulty sensors such as MAF or TPS.
• Valve or flap issues causing noise or malfunction, especially on petrol models from 2019.
• Exhaust odours, often on diesel Kadjar Energy dCi 130, requiring professional inspection promptly.
• Unusual noises like clattering or buzzing usually due to rust or loose exhaust pipe fixings.
• Gas treatment faults from defective NOx sensors or DPF, sometimes accompanied by engine warning lights.

Using an OBD-II scanner for error codes is advised to diagnose these symptoms accurately.

The exhaust system evacuates engine gases while reducing noise, temperature, and harmful emissions. It includes a catalytic converter (containing precious metals like platinum, palladium, and rhodium) and a lambda sensor that regulates the air/fuel mixture for optimal engine efficiency and lower fuel consumption.

• Failure to maintain the system can result in leaks, increased fuel consumption, excessive noise (which might be subject to fines), and a drop in engine power.
• Rust, particularly on the muffler, can accelerate in wet or salty environments.

This system is essential for both diesel and petrol Kadjar models to meet emission standards and deliver reliable performance.

General maintenance guidance includes:

• Check the exhaust system every 20,000 miles.
• Inspect the catalytic converter approximately every 100,000 miles.
• Check and possibly replace the muffler every 60,000 to 80,000 miles during regular servicing.

Any replacement or service should be handled through specialised garages familiar with Renault Kadjar requirements to ensure proper fit and function.

Diagnosis steps involve:

• Checking the air filter and fuel injectors for cleanliness and blockage.
• Performing a road test while monitoring engine RPM and power delivery.
• Using an OBD-II scanner to retrieve error codes related to sensors such as NOx and lambda.
• Consulting a specialist for detailed inspection and potential DPF or sensor issues.

Correct diagnosis prevents worsening damage and maintains vehicle performance and emissions compliance.

Yes, some issues are more common on specific models:

• Petrol Kadjar 2019 models often experience valve or flap failures causing noise or malfunction.
• Diesel Kadjar Energy dCi 130 models report odors, exhaust gas leaks, and rust-related noises more frequently.
• Both engine types can suffer from clogged injectors, dirty air filters, and faulty sensors affecting exhaust smoke colour and engine power.

Knowing your Kadjar’s engine type helps target maintenance and repair actions effectively.

Maintaining your Kadjar's exhaust system is crucial because:

• A well-functioning exhaust reduces harmful emissions and noise, ensuring environmental compliance and avoiding fines.
• It helps maintain engine performance and fuel efficiency by ensuring correct air/fuel mixture control.
• Proper upkeep prevents costly repairs caused by rust, leaks, and sensor failures.

Regular checks and servicing optimise your vehicle’s reliability and longevity.

For detailed advice and troubleshooting, explore:

• Community forums with user experiences discussing exhaust valves, DPF, and NOx sensor issues.
• Professional diagnostic and repair sites for technical guides on exhaust smoke colours, noises, and maintenance.
• Specialist Renault garages offering accurate diagnostics and genuine replacement parts certified for your Kadjar model.

Using the vehicle identification number (VIN) helps ensure compatibility when searching for parts like catalytic converters or DPF.

Always consult qualified specialists for exhaust repairs or replacements to maintain safety and compliance.