Exhaust Renault Scenic

Renault Scenic models, especially diesel versions like 1.5 dCi, 1.6 dCi and 1.9 dCi FAP, often face issues such as a seized or blocked exhaust gas valve, blocked exhaust components (catalytic converter or DPF), leaking hoses, and faulty flaps. These problems can cause loss of power, whistling noises, error messages such as "antipollution to check" or "injection to check", and exhaust leaks.

Frequent symptoms of exhaust issues include:

• Loss of power and deceleration due to blocked valve or catalytic converter obstruction.
• Whistling sounds on acceleration from air or gas leaks in EGR system.
• Dashboard error messages related to antipollution or injection systems.
• Presence of oil or black liquid in exhaust pipes indicating leaks or damaged hoses.
• Engine backpressure that could cause mechanical wear or damage.

Main components causing problems include:

• Exhaust gas valve – tends to seize or weld shut, especially around one metre from the engine; requires regular maintenance with degreaser.
• EGR valve and hoses – stuck valve causing oil leaks, and cracked intercooler hoses.
• Turbo hoses and seals – missing or damaged turbo hose joints can cause power loss.
• Blocked catalytic converter or DPF causing gas flow obstruction and engine backpressure.
• Faulty exhaust flap actuators.
• Damage or blockage to overall exhaust system, including rodent damage to hoses.

These issues mostly affect Scenic 3 and Grand Scenic diesel engines.

A common DIY method for valve maintenance is:

• Raise the car safely on stands.
• Remove the EGR valve by undoing two bolts.
• Spray the valve shaft and spring with WD40 degreaser every four months.
• Manually move the valve using pliers or hammer until it moves freely.
• Reinstall the EGR valve carefully.

This preventive method helps avoid valve seizure due to road salt or contamination.

Recommended repairs include:

• Replacing the exhaust gas valve with original Renault parts, including professional fitting.
• Replacing cracked intercooler hoses (part reference 144603264R).
• Replacing turbo hose seals and injectors after professional diagnosis via OBD.
• Cleaning or replacing blocked catalytic converters or DPF filters.

Costs vary but expect around £265 for valve and hose replacement at Renault dealers, excluding turbo or catalytic converter repairs.

To maintain your exhaust system effectively:

• Regularly apply degreaser such as WD40 to prevent valve seizing.
• Replace air filters every 20,000 km and fuel filters every 40,000 km.
• Perform periodic cleaning of injectors and DPF filters.
• Use professional diagnostics to catch early signs of failure.

These steps help reduce noise, loss of power, and costly engine damage.

Common dashboard messages indicating exhaust or emission problems include:

• "Antipollution to check"
• "Injection to check"
• Messages related to EGR valve or sensors
• Noise and pressure-related alerts on engine control units

These messages signal possible valve blockage, sensor failure, or leaks and warrant professional diagnostics.

For genuine quality parts and professional advice:

• Choose original manufacturer parts backed by warranty and quality certifications.
• Order parts directly from certified suppliers offering stainless steel catalytic converters and DPFs with technical support.
• Seek diagnostic and fitting services from trusted automotive garages experienced with Renault Scenic exhaust systems.
• Refer to automotive forums, repair guides, and video tutorials to help understand and verify the repair work.

Ensuring correct fit and quality parts improves system performance, reduces noise, and maintains engine safety and compliance.

Contact your local Renault authorised service for precise diagnostics and repair quotations.