Why is the catalyst so important?

The catalytic converter is a key component of the exhaust system. It converts pollutants such as carbon monoxide, nitrogen oxides, and unburned hydrocarbons into less harmful substances. This ensures clean exhaust gases and compliance with legal emissions standards. You can find replacement parts in our Catalytic Converters category .

Typical symptoms of a defective catalytic converter

A defective catalytic converter will display several warning signs. Early detection can save significant costs.

1. Loss of performance

The vehicle feels sluggish and accelerates less smoothly. Often, the cause is a blockage in the catalytic converter, which blocks the exhaust flow.

2. Unusual noises

A rattling or clattering noise indicates that parts inside have come loose.

3. Increased fuel consumption

A disrupted exhaust gas flow often leads to higher consumption – a classic warning sign of a defective catalytic converter.

4. Control light in the cockpit

The Check Engine Light illuminates when sensors report unusual readings.

Common causes of catalytic converter damage

• Defective spark plugs or faulty injection → unburned fuel enters the exhaust tract
• Oil or coolant leakage → enters the catalyst and damages the ceramic
• Mechanical damage caused by stone chips or impact
• No maintenance carried out for a long time

What to do if the catalytic converter is defective?

Exchange in the workshop

The safest option is to have the repair done by a specialist workshop. They will professionally replace the old catalytic converter. You can find suitable parts in our Exhaust Repair category .

Replace it yourself?

Experienced hobby mechanics can also replace the filters themselves. Proper fit and tested quality are essential. KatDoc offers catalytic converters , diesel particulate filters, flexible hoses , lambda sensors , and oil filters of tested quality.

Conclusion: Acting early saves costs

A defective catalytic converter can be indicated by a loss of power, unusual noises, or a warning light in the cockpit. Reacting promptly can prevent expensive consequential damage. With spare parts from KatDoc – from catalytic converters to diesel particulate filters to oil filters – you can stay reliably mobile.