Catalytic converter theft in the UK: the figures, the risk, and what to do if it happens

Catalytic converter theft has been one of the most persistent vehicle crime trends of the last five years, and it is driven by something simple: the platinum, palladium and rhodium inside every unit. When those metal prices rise, thefts follow.

The scale of the problem

• Almost 100,000 catalytic converters were stolen across the UK between 2019 and 2022, driven by rising platinum, palladium and rhodium prices (RAC / Crimestoppers).
• London excluding the City recorded over 30,000 thefts between 2020 and 2022 alone — more than any other UK police force area. Hertfordshire was a distant second at around 2,100 (GoShorty / Fleet News FOI data).
• A converter can be cut away in under two minutes and sold on for £500 or more, while the owner faces an average replacement bill of around £1,300 (Crimestoppers).
• Thefts then fell steeply. Auto Express FOI data found a 98% average drop across 30 police forces by 2024 compared with 2021, following forensic marking schemes and targeted police operations.
• That fall may not hold. Aftermarket supplier BM Catalysts reported renewed upward pressure on theft rates in late 2025, linked directly to rising precious metal prices.

The pattern worth noting is that enforcement suppressed the crime rather than ending it. The underlying incentive — a few hundred pounds of recoverable metal, accessible in minutes with a battery saw — has not gone away, and it strengthens whenever metal markets move.

Why hybrids are targeted more

Petrol hybrids are consistently over-represented, and the reason is a quirk of how they run. Because the engine cuts out and the car operates on battery power for part of every journey, the converter spends less time at full operating temperature — and a converter below its light-off temperature is not doing much.

Manufacturers compensate by building hybrid converters with a higher loading of precious metal, so they remain effective despite the interrupted heat cycle. That higher metal content is precisely what makes them worth more to steal. It is an unfortunate piece of engineering logic: the design change that keeps hybrids clean is the same one that makes them a target.

Ride height matters too. Vehicles with more ground clearance are quicker to get under, which is why 4x4s, vans and taller hybrids feature disproportionately in theft figures.

Reducing the risk

• Park defensively. Off-street where possible, in a garage if you have one, or against a wall or kerb so there is no room to get underneath.
• Use light and overlooking. Well-lit, busy and overlooked spaces are markedly less attractive than quiet side streets and unlit car parks.
• Have the unit forensically marked. Marking schemes make a stolen converter far harder to sell on, and the sharp fall in thefts through 2023–24 suggests they work.
• Consider a physical guard or cage. Available for many commonly targeted models, particularly hybrids and vans.
• Check your alarm settings. Some vehicles allow tilt sensitivity to be increased, which can trigger when a car is jacked.
• Fleet operators: concentrate the risk. A single secured, monitored compound is easier to protect than vehicles taken home overnight across a region.

What to do if yours is stolen

The symptom is unmistakable: a violently loud exhaust the moment you start the engine, usually with a warning light and a noticeable loss of drivability.

1. Do not drive it. Without a converter the vehicle is emitting above the legal limit. Driving it is an offence and can bring a fine of up to £1,000 (Crimestoppers).
2. Report it to the police and obtain a crime reference number — your insurer will require it.
3. Contact your insurer. Theft of the converter is usually covered under comprehensive policies, though the excess may approach the cost of the repair on smaller vehicles.
4. Arrange a replacement unit. A stolen converter cannot be recovered by cleaning — there is nothing left to clean. Replacement is the only route, and units are available from our DPF and CAT shop.
5. Protect the new one. A vehicle targeted once is often targeted again, so marking or a guard is worth fitting at the same time.

One distinction worth being clear about, because it comes up constantly on the phone: theft and blockage are entirely different problems with entirely different answers. A converter that is contaminated or carbon-blocked can frequently be recovered through professional CAT cleaning rather than replaced, which is a far smaller bill. A converter that has been cut off the car cannot. If you are unsure which situation you are in, the noise tells you — a stolen unit is deafening.