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rover 75 ecu - hammer
Can anyone tell me what the ecu that is situated in the bulkhead plenium chamber controls
rover 75 ecu - LeePower
You mean the ECU next to the pollen filter behind the bulkhead?

Thats the engine ECU.

Also make sure you keep the 2 x drain holes in the bulkhead chamber clear from rubbish, Rover 75s love to drown there ECUs when the drain holes block up & cause very expensive repair bills for owners.
rover 75 ecu - R40
As well as the drain hole on each side of the 75/ZT engine bay (top corners by the windscreen) make especially sure that the drain hole at the base of the ECU/pollen filter container is completely clear or the ECU takes a bath and so does your wallet.

A common design across several manufacturers-anfd a daft place to put electronic equipment.

Regards

M