Renault Master Catalytic Converter

The Renault Master catalytic converter is a crucial component of the exhaust system that transforms harmful pollutant gases into less harmful substances by chemical reactions, helping to reduce vehicle emissions and protect the environment.

The catalytic converter operates in two main chemical stages :

• Reduction Catalysis : Nitrogen oxides (NOx) gases are reduced using rhodium or platinum catalysts.
• Oxidation Catalysis : Unburned hydrocarbons and carbon monoxide are oxidized (converted by combustion) with the help of a catalyst containing platinum and palladium.

This process occurs efficiently once the temperature exceeds +200°C, with sensors relaying temperature and oxygen data to the engine's control unit.

The catalytic converter contains precious metals acting as catalysts to enable chemical reactions :

• Platinum
• Palladium
• Rhodium

Its robust metal housing integrates the catalytic converter along with sensors and particle collection systems to ensure proper operation.

On the Renault Master, the catalytic converter is built into the exhaust manifold at the beginning of the exhaust system. The metal casing contains :

• The catalytic converter unit
• A particle collection unit
• An oxygen sensor (lambda sensor) at the inlet
• A temperature sensor
• A heating sensor at the outlet

If the catalytic converter malfunctions, these symptoms may be observed :

• Difficulty starting the engine
• Reduced engine power and slower acceleration
• Increased fuel consumption
• Illumination of the Check Engine warning light
• Abnormal noises from the exhaust during intense engine operation

Replacement involves cutting and removing the catalytic converter section located approximately mid-way between the mounting point and the central silencer. This procedure is best performed by a professional technician to ensure proper handling and compliance with regulations.

Some owners consider replacing it with a flame arrestor bypass, but this raises legal and technical concerns.

The catalytic converter's operation is monitored and controlled by :

• An oxygen (lambda) sensor measuring oxygen concentration before and after the converter
• The engine control unit which receives sensor data to regulate engine and exhaust parameters
• Various emission concentration sensors to ensure compliance with environmental standards

Specific catalytic converter protection systems (cat locks) are available for Renault Master models from 2022 to 2024. These provide enhanced protection against dust and dirt, which helps extend the converter's lifespan.

Proper maintenance also includes monitoring engine performance, using the correct fuel, and replacing related sensors as recommended to ensure optimal catalytic converter condition.