This bulletin applies to 2014-2019 Mini Clubman, hardtop 4-door built October 2013 through June 2019, hardtop two-door built April 2013 through July 2019, convertibles built November 2014 through June 2019 and Countryman built November 2015 through September 2019.
The MIL may be on accompanied by DTC 118002 (mixture control...fuel-air mixture too rich) stored in the DME. The fault generally only occurs during cold winter months. Note that various other causes for a rich mixture fault are possible and should not be overlooked.
The likely cause is the DME software diagnostic that is too sensitive. The situation is most likely to occur if the driving profile is one of frequent cold engine starts and/or primarily short distance trips where full engine operating temperature is not reached. Due to the lower engine oil temperatures, crankcase vapors that contain a higher fuel content are not completely drawn off via the crankcase ventilation system. A false DEM adaptation routine could then lead to this fault being set.
Check for a rich mixture condition. Program the vehicle with ISTA Next. Let the engine idle at operating temperature. If the mixture adaptation drops significantly below 1.0, it indicates a rich mixture.
Replace the engine oil and filter on a warm engine. Do not reset the condition based service (CBS) for engine oil service unless the oil service shows to be currently recommended/due.
Upgrade vehicle software using ISTA Next to F056-19-03-540 or higher (F056-19-11-510 or higher for PHEV Mini Cooper S E Countryman ALL4.
Inspect the cylinder head cover and replace as needed. Inspect the version of the cylinder head cover. If you find that the cover is the “old” version, replace the cover using the new, updated version (see photos for examples of old/new). The updated version can be identified by the additional supports on the crankcase ventilation ports.
