Is an engine warning light an MoT fail on pre-2008 diesel cars?

Is an engine warning light an MoT fail on pre-2008 cars? As of 25 March 2019 the official reference for diesel engine date is no longer working and I cant find a reference anywhere. Can you give me the new reference? This is critical as my diesel just failed MoT on this point and it never failed before on this point. In fact diesel engines don't seem to be mentioned anywhere in the rules any more.

Asked on 2 March 2026 by John Donaghy

Answered by David Ross

The MoT tester only needs to inspect the engine MIL (Malfunction Indicator Lamp) fitted to diesel vehicles first registered on or after 1 July 2008.

It is clearly stated in the MoT Inspection Manual here: www.gov.uk/guidance/mot-inspection-manual-for-priv...2

If the MoT tester refuses to correct their mistake then you should make an official complaint to the DVSA and have the decision overturned: www.gov.uk/government/publications/complain-about-...t

Tags: mot engine management diesels

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