I presented my Mercedes-Benz Vito to Marshall Mercedes-Benz Truck & Van Fareham with an Engine Management Light (EML) fault in early 2026.   Over the following eight months, I authorised multiple repairs and diagnostic investigations based on the dealership's recommendations. Throughout this process, several emissions-related components were repaired or replaced and approximately £6,000 was spent attempting to resolve the issue.   Despite this expenditure, the original EML fault remains unresolved.   To be fair, some members of staff were courteous and spent time reviewing the case. However, the overall process involved repeated visits, changing diagnoses, extended delays and significant cost without ultimately rectifying the original fault.   The matter has since been escalated to Mercedes-Benz UK and the Motor Ombudsman for independent review.   I remain hopeful that a fair resolution can still be reached, but based on my experience to date, I cannot rate the service more highly.