Drivers and businesses are being urged to do their bit to try to prevent thefts from vehicles.
A catalytic converter valued at £1,500 was removed from a Mercedes van in Ronald Road, Halstead last week.
PC Chris Philpott said: “It is quick and silent and it only takes 30 seconds to remove a catalytic converter, so it is difficult to stop.
“We do constant foot patrols, but it would be nice to see companies trying to look at things to help deal with it.”
Anybody with information is asked to call Essex Police on 101 or Crimestoppers on 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here