Exhaust Dacia Logan

Common exhaust issues include excessive noise caused by defective exhaust valves, black smoke due to injector leaks, rapid clogging of the diesel particulate filter (DPF), and exhaust gas odors entering the cabin. Faulty exhaust valves increase noise and may trigger error codes, while leaking diesel injectors cause black smoke and difficult cold starts. The DPF can clog quickly, especially with frequent city driving, reducing engine power and illuminating the engine fault indicator.

The noisy exhaust is often linked to malfunctioning exhaust valves (exhaust flaps) that fail to open and close properly, causing a significant increase in engine noise. This defect also triggers warning lights on the dashboard and can lead to further exhaust system issues if not addressed. It's recommended to have the valve checked and replaced if necessary to restore normal operation and reduce noise levels.

The DPF on diesel versions tends to clog rapidly, particularly with frequent urban driving, leading to power loss and engine warning lights. To prevent this:

• Use special additives for regular DPF cleaning.
• Drive periodically at higher speeds on highways to burn off soot accumulations via passive regeneration.
• Schedule professional DPF cleaning every so often, which can cost between 200 to 300 €.

Replacement of the DPF can be more expensive, up to around 1,000 €.

Specific engine problems linked to the exhaust include:

• 0.9 TCE petrol engine: Frequent leaks at the thermostat joint cause coolant loss, unexplained overheating, and wet patches under the engine. Repair costs range from 50 to 150 € depending on parts replaced.
• Diesel dCi engines: Defective injectors are a primary concern, costing approximately 120 to 140 € per injector, with recommendations often to replace all injectors to avoid mechanical imbalance.

Exhaust gas odors entering the cabin can result from several factors:

• A stripped or faulty screw in the exhaust manifold on the cylinder head, causing leaks.
• The diesel particulate filter becoming clogged and causing backpressure.
• Seal or tightness issues after body repairs or chassis work.

Addressing these issues promptly is important for safety and comfort.

To keep the exhaust system and engine running smoothly, perform regular maintenance including:

• Regular engine oil changes every 15,000 km or sooner under intensive use, to prolong turbo life and reduce engine deposits.
• Periodic checks and replacement of the thermostat joint for the 0.9 TCE engine.
• Cleaning the EGR valve regularly using specific additives or by driving at sustained high speeds on highways.
• Replacing the timing belt every 60,000 to 120,000 km depending on model specifications.

Following these steps helps avoid common exhaust-related problems and preserve engine performance.

It is advisable to choose Dacia Logan models produced after 2013, as these feature notable improvements in overall build quality and exhaust system durability, reducing the likelihood of encountering common exhaust and engine problems reported in earlier models.

For further insights and community support, these resources are helpful:

• Sovab Renault Batilly – detailed mechanical problem guides
• MyCarly Community – discussions on exhaust valve issues and engine start problems
• Logan Forum Actif – suspension and exhaust line challenges
• My-ProCar – mechanical expertise on exhaust smoke issues
• Official Dacia Owner Community – user experiences and troubleshooting

For genuine, high-quality exhaust components such as DPFs and catalytic converters, consider purchasing from Krosfou, which offers new stainless steel parts with 3-year warranty and free shipping in Europe.