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Can I reject my secondhand diesel because the DPF light keeps coming on?

I’ve recently bought a used car on finance with a deposit of £1000. On day three of having the car (less than 50 miles later), the engine management light came on. I rang the dealership and took it in. They ran a diagnostics and the problem is with the diesel particulate filter (DPF) amongst other things. They hooked it up to a laptop and did a forced regeneration and the light went off. I took the car home and less than 50 miles later, the engine management light came back on again. I had another diagnostics done and it's coming up with the exact same problems as before. I’m well within my 30-day warranty, so does a dodgy DPF mean that the car isn’t ‘fit for purpose’, and where would I stand if I chose to reject the car?

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Yes, you can reject the car for a fundamental fault that preceded your ownership of it under the Consumer Rights Act 2015 and under previous case law, in particular Clegg v Olle Andersson (trading as Nordic Marine) House of Lords 2003: www.honestjohn.co.uk/faq/consumer-rights

At the very least the DPF needs to be chemically cleaned out of ash that would mean sending it away to a company such as Ceramex, but there may be other problems with DPF regeneration. Hoping you get your money back, don't buy another secondhand diesel. Get petrol this time round.
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