Main faults of fuel and exhaust systems (Peugeot 406)

Increased fuel consumption

• the air filter element is dirty;
• fuel injection system damage (gasoline engines);
• the injectors are faulty (diesel engines);
• incorrect ignition timing (gasoline engines);
• low tire pressure.

Fuel leaks

• the fuel tank, pipes and hoses are damaged or rusted.

Increased noise in the exhaust system

• the exhaust system is leaky or the exhaust manifold is not securely screwed on;
• damage to mufflers or pipes;
• the exhaust system suspension or its contact with the vehicle body is defective.