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The company has identified problems with the PCV valve heater and the blower-regulator wiring harness.

BMW has issued two recall campaigns for around 1.4 million vehicles, both addressing problems that can lead to engine compartment fires.More than 740,000 vehicles were built with a PCV valve heater prone to short circuit, causing the valve to melt and potentially causing a fire even when the vehicle is not running.

The campaign affects certain 2007-2011 1-Series, 3-Series, 5-Series, X3, X5 and Z4 vehicles.

The first signs of trouble trace back to 2009 when an X5 experienced "heat-related damage" to the engine compartment. Additional incidents occurred in later that year and in 2010, however BMW did not issue a recall until recently consulting with Canadian and US safety regulators.

Around 673,000 vehicles are being recalled to deal with a separate issue involving a blower-regulator wiring harness used in the 2006-2011 3-Series. Some of the connectors were coated in tin rather than silver, contributing to fretting corrosion and overheating at the harness connection.

The wiring harness problem has been associated with one report of injuries.