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FAQs

To help you gain an insight into the whys and wherefores of catalytic converters, we've compiled a list of the questions most frequently asked by customers – and of course the answers to them. We hope we can in this way answer most of your questions and deal with any concerns.

• Exhaust emissions test – how often does my car have to go?
• I've heard of something called a "catalyst support" or "core". What is it?
• HJS KAT 2000 – is that a closed- or an open-loop system?
• Carbon monoxide (CO)
• Hydrocarbons (HC)
• What is the lambda sensor?
• Nitrogen oxides (NOx)
• Emissions sticker – does it make any difference that my petrol-driven car has an open-loop cat rather than no cat at all?
• Upgrade cat – what are the advantages of having one fitted?
• What is an oxidation catalytic converter?
• What is "vehicle type approval"?
• What happens to used catalytic converters?
• What could cause a cat to fail?
• What emissions does a diesel engine output?
• What emissions does a petrol engine output?
• How does a catalyst/catalytic converter work?