Recent Local Spike in Thefts Of Catalytic Converters

Some advice from the OWL neighbourhood watch service


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Brentford Safer Neighbourhood Team (SNT)
(aka NPT Neighbourhood Policing Team)

Twitter @MPSBrentford
Office tel: 020 82475974
020 8721 2533
Mobile tel: 07881723891

Brentford Street Briefings

Syon Street Briefings

In an emergency ALWAYS dial 999
For all NON emergency calls use 101
If you have no mobile signal, 999 will NOT work but 112 will put you straight through to the emergency services.

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There has been a recent spike in catalytic converter thefts in the Chiswick and Brentford area, suspects are seen to be wearing Balaclavas and/or Hi-vis jackets. If you seen anyone suspicious carrying a angle grinder tool or looking under vehicles then call the police. Do not approach the suspcts as they are known to be violent.

Thieves have generally sawn off the converters - so please be mindful where you keep your vehicle, and report anyone acting suspiciously near a vehicle. If you suspect your catalyic converter has been stolen, report it immediately on 101.

Catalytic Converter

What does a Catalytic Converter do?

The main function of a catalytic converter is to clean up the exhaust gases from an engine before they exit the exhaust pipe. It is a small filter that looks like a honeycomb which the thieves are usually after.

Why are CAT stolen?

“Catalytic’ refers to the chemical reaction that takes place inside the converter with the help of “catalyst” material which is usually metal such as platinum, palladium or rhodium.

Thieves are after these precious metals that are found inside the filter.

How do I know my catalytic converter was stolen?

When stealing a CAT the muffler is disconnected, so your vehicle will sound very loud. In this case, the vehicle should not be driven and instead, it should be towed to a garage.

Reports from Garages

Changes have happened in the past few years and the CAT now sits higher and nearer to the engine making access to it a bit more difficult.

Prevention Tips

Raise awareness of the issue in your community and report immediately any suspicious activities by calling 999.

Consider installing CCTV devices as major deterrents and could cost less than replacing a CAT.

There are anti-theft systems, locks and “motion” alarms, which can be purchased and fitted. Search online for "catalytic converter lock".

OWL Neighbourhood Watch

Officers will continue to engage with the local communities to try and identify issues early and intervene to prevent issues escalating. The use of OWL to flag any instances to the Police will play a key role in maintaining this reduction. Residents can register for OWL at

November 8, 2019

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