My son's newly bought Mazda CX-5 cut out and the engine management light is on - what's wrong with it?

My son purchased a 2014 Mazda CX-5 2.2d with 27,000 miles on from a Mazda dealer. It cut out at a roundabout and would not start and the Engine Management light was on. It was towed back to the dealer, but so far they say they cannot fix it and are consulting Mazda. I dipped the oil when it stopped and it seemed very sludgy, but the level was normal. Has my son bought a lemon?

Asked on 3 July 2018 by serolis

Answered by Honest John
If the engine is repeatedly switched off while the DPF is regenerating then the post-injected diesel intended to fire the DPF sinks into the sump, raises the engine oil level and forms a sludge that can block the sump strainer.
Similar questions
I'm interested in understanding why a driver cannot request their car to kick off a regeneration manually, for example, when they get on the motorway for a long journey. I have a Honda CR-V 2.2 with a...
Can you please advise how to regenerate the DPF on a Mercedes-Benz E-Class?
I have a 2008 Renault Koleos 2.0d. In the past two weeks I've done four journeys in excess of 50 miles at high speed (dual carriageway). A couple of days ago, a warning appeared saying "check exhaust emission"...
Related models
Economical and efficient. Comfortable ride. Well equipped as standard. Practical and spacious yet compact.
 

Value my car

Save £75 on Warranty using code HJ75

with MotorEasy

Get a warranty quote

Save 12% on GAP Insurance

Use HJ21 to save on an ALA policy

See offer