Catalytic Converter Theft in Northern Ireland Fell Sharply — But the PSNI Figures Have an Important Catch

PSNI records identify 63 catalytic-converter theft offences between 2019 and 2024, including a fall from 21 in 2022 to three in 2024. The underlying police search method is crucial to understanding what the numbers mean — and what a second-hand car buyer should inspect.

Six years of police records, not a national estimate

The familiar image of catalytic converters being cut from parked vehicles has generated years of warnings to motorists. Northern Ireland now has a more precise local record. In freedom-of-information disclosure FOI/15480, released on 20 November 2025, the Police Service of Northern Ireland set out the number of recorded burglary, robbery and theft offences in which a catalytic converter was identified as stolen property. Across the six complete calendar years 2019–2024, the total is 63.

The annual breakdown is striking: 11 in 2019, nine in 2020, 16 in 2021, a peak of 21 in 2022, and only three in both 2023 and 2024. The recorded count in 2024 was about 86 per cent lower than in 2022. That is a change in the recorded series, not proof that theft risk fell by exactly 86 per cent for an individual owner. Neither the number of vehicles on the road nor the probability of reporting the loss is included in the disclosure.

Why the classification is as important as the headline

This is not a dedicated nationwide count of every vehicle from which a converter was removed. The PSNI searched property common-name and remarks fields for the words “catalytic” or “cat con”. Relevant incidents have to have been recorded in a way that allows the search to find them. Theft reports using different terminology, ambiguous descriptions or no named component may not appear. Conversely, the extraction covers qualifying burglary, robbery and theft offences and is not restricted to an offence category labelled “theft from a motor vehicle”.

That distinction changes what can be concluded. The figures support the statement that recorded offences matching this property-description search became much less numerous after 2022. They do not tell us that catalytic-converter crime has disappeared, or establish how many attempts failed. There is no reliable vehicle-make ranking, council-by-council rate or insurance loss estimate in this disclosure. Inventing one from a six-year total would be misleading.

The police also reported that two of the incidents had resulted in a conviction when the information was extracted. That is not necessarily the number of people convicted, and it is not a valid conviction rate for an entire six-year cohort. Investigations, prosecution decisions and cases still in progress can sit at different stages; the PSNI said the live-system figures may change.

What a missing converter does to a car — legally and mechanically

Catalytic converters are part of the exhaust emissions-control system. Petrol engines commonly use a three-way catalyst to convert harmful exhaust constituents; diesels may have oxidation catalysts and other after-treatment hardware. A converter cannot simply be treated as an optional silencer. For vehicles to which the relevant test criteria apply, its removal can make the vehicle unroadworthy and undermine emission control.

Northern Ireland’s DVA exhaust inspection instructions, DVT 932 Issue 6, are explicit: a catalytic converter or particulate filter missing where one was fitted as standard is a MAJOR defect. The same instructions treat exhaust fumes entering the cabin as a DANGEROUS defect. On petrol spark-ignition vehicles, the specified converter-presence inspection includes vehicles first used on or after 1 July 2002 and within the detailed vehicle categories; diesels are checked where the component was fitted as original equipment. A passing MOT certificate does not authorise subsequent removal.

A stolen converter may leave severed pipework, an abruptly noisy exhaust, disturbed heat shields or wiring damage around exhaust oxygen sensors. Those symptoms are clues, not a conclusive diagnosis: a routine exhaust leak or an earlier repair can cause some of the same signs. A workshop should identify the original exhaust configuration using the exact engine and vehicle identification details before recommending parts.

The second-hand buyer’s risk is not the theft figure

Suppose a used hybrid has a recent test pass, a tidy engine bay and a seller who says it only needs a small exhaust repair. The actual purchase risk is that the catalytic equipment is missing, replaced with an incorrect unit or masked by an improvised section of pipe. Repair cost depends heavily on the vehicle, approved parts availability and associated sensors. It cannot be calculated from the PSNI’s theft totals, which are crime statistics rather than workshop invoices.

For an advertised car, request a clear photograph of the exhaust and underbody where the catalyst normally sits, plus receipts if that section has been repaired. Have an independent garage check the component against the manufacturer’s configuration. A generic “MOT passed” statement is not a substitute for this inspection. On an unfamiliar import, ask the garage to verify the proper equipment for that exact variant rather than assume the UK-market exhaust layout is identical.

When comparing two cars, price the verified repair required to restore lawful roadworthiness before negotiating. Do not automatically accept a low-cost universal converter as equivalent to the specified part; emissions compliance, fitment, sensor locations and warranty terms matter. If the exhaust has been welded or altered, ask the seller why and keep that explanation in writing.

Which owners should pay attention?

The PSNI’s general vehicle-theft advice identifies hybrids as commonly targeted and notes that the ride height of vans and SUVs can make underbody access easier. Those are crime-prevention observations, not an NI-specific statistical ranking by make or model. This distinction matters: the six-year FOI table contains no evidence that any particular hybrid or SUV sold in Northern Ireland has a measured higher theft rate.

A sensible response is proportionate. Park in a well-lit, overlooked place when possible; use secure parking where available; and ask the manufacturer or dealer whether a model-specific approved converter guard is offered. Physical guards have to avoid exhaust heat, ground-clearance and service-access problems, so a universal plate fitted without proper checks is not necessarily safe. Report an actual theft to the PSNI and preserve photographs and repair documentation for the insurer.

For dealers, the best defence against a later dispute is to record exhaust-component condition during acquisition and preparation. Keep a photograph, diagnostic notes where relevant and the invoice for any compliant replacement. That is stronger evidence than a generic vehicle-preparation checklist.

The finding — and the missing evidence

The defensible finding is that catalytic-converter theft was identified in 21 qualifying PSNI records in 2022 but only three in 2024, using the police’s stated keyword-based method. The most important unresolved issues are whether this reflects a sustained reduction, a change in offending or changes in recording, and whether insurers or repairers have a broader count of losses than the offences found by the police search.

A proper follow-up would request a consistent 2025 and 2026 series using the same extraction rules, ask how reports with unspecified exhaust components are coded and obtain anonymised breakdowns only where numbers support meaningful comparisons. Until then, PureCar’s useful conclusion is practical rather than sensational: the recorded crime count has fallen sharply, but confirming the converter is present and compliant still belongs on a serious used-car inspection.

Sources and reporting method

Derived total 63 and 2022–24 fall 85.7% calculated from PSNI 11,9,16,21,3,3. Keyword-retrieval methodology explicitly limits completeness. No counts beyond December 2024 claimed.

Primary documents consulted: PSNI FOI/15480 catalytic-converter theft 2019–2024; PSNI vehicle-theft prevention guidance; DfI/DVA DVT 932 Issue 6 exhaust-system rejection criteria.