A legal firm is investigating a group class action against Jaguar Land Rover (JLR) over an alleged faulty diesel filter system in a range of its 4×4 vehicles.

The potential group action by law firm Milberg London seeks more than £3bn on behalf of JLR customers.

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The consumer rights lawyers leading the claim allege that several JLR models, including the Range Rover Evoque, Range Rover Sport, Range Rover, Land Rover Discovery, Land Rover Discovery Sport and Jaguar E-Pace, suffer from defects that affect the vehicles’ performance, subjecting owners to costly repairs and potentially serious safety consequences. 

The claim alleges that cars with a defective diesel particulate filter (DPF), which captures and stores particles from exhaust gases, need to be serviced more frequently than promised at the time of purchase.

It is claimed that this because the system causes accelerated oil dilution, leading to wear on engine components and the vehicle needing more frequent oil changes.

The lawyers acting on behalf of customers allege that a full or clogged DPF can cause the car to enter “limp mode”, making it slower and less responsive, increasing the risk of an accident and putting both the owner and other road users in danger.

Jaguar Land Rover is facing a similar case in Australia, which is ongoing. 

A spokesman for Jaguar Land Rover said: “We have not been notified of any legal claim in the UK but would vigorously contest any such claim.

“Our products are of the highest quality and meet all regulations and standards of the markets where they are purchased. Our highest priority is always to ensure that our clients enjoy the best possible experience.”