Features of Volkswagen Catalytic Converters

This guide provides a clear, practical overview of features of volkswagen catalytic converters, with useful context, important details, and straightforward takeaways for everyday readers.

This spare part is designed for an average run of 90,000 miles. But it rarely fails due to wear. More often than not, the catalytic converter stops performing its functions for other reasons. This guide will discuss the main factors that reduce the service life of the exhaust gas converter not only for Volkswagen but also for any other vehicle brand.

Catalytic converter functions

Despite the high quality of German cars, some units fail during operation. This is also applicable to catalytic converters.

This element plays an important role in vehicle operation. The exhaust system dampens the sound of the engine. But the main function of the catalytic converter is to purify the exhaust gases.

The exhaust contains the following environmentally hazardous trace elements:

• nitrogen oxide;
• carbon monoxide;
• hydrocarbon.

These substances are converted into water vapor, carbon dioxide, and nitrogen through the chemical reactions that take place in the converter. 

Symptoms of failure

If the catalytic converter ceases to function properly, negative changes are felt in the vehicle's operation, including the following:

• loss of performance;
• increased fuel consumption;
• difficulties with starting the engine;
• the unpleasant smell of sulfur in the exhaust;
• the "Check Engine" indicator lights up on the dashboard and does not go out.

The converter is controlled by air sensors - lambda probes. When it comes to modern vehicles, in case of serious problems with the catalytic converter, the system automatically switches the engine to the emergency mode or does not allow it to start at all.

Causes of failure

Catalytic converters most often fail for the following reasons:

• clogging of the inner block channels with soot;
• melting of the catalytic layer;
• mechanical damage.

The inner block has many narrow channels and is made of ceramic. Therefore, this part is quite fragile. It is sensitive to shocks, strong and frequent vibrations, and can also be damaged by fuel detonation in the exhaust system.

The use of low-quality fuel and leaded gasoline significantly reduces the useful life of the catalytic converter. Various additives and third-party elements stick to the walls of the converter, clog the channels, thus reduce the throughput of the exhaust system. Clogging is a gradual process but the first signs of a converter's malfunction may appear in the early stages.