Freelander 1 L series MIL

Hi guys!
I posted previously a thread about many problems including the MIL light.
After I replaced the headgasket (because it's overpressurised the coolant sys.) the MIL light comes on at const. RPM (between 1,5K and 2K).
Could a pressure/temp sensor could get the MIL going?
Or does the rich/too much oil gasses affect the MIL?
At some point when I release the gas pedal the MIL goes off for a bit, but the motor keeps rattling. (But when I depress the clutch and the motor goes to idle, it stops doing the rattle thing. Btw fuel filter is new and the entire fuel system is clean.

The L series MIL comes on for very few items, mostly emissions stuff, so check the MAP sensor pipe or replace the MAP sensor itself. The pintle lift sensor is another item that causes the MIL to come on. Really a diagnostic is needed to identify the component giving trouble.

I thought this thread was " large series milf"...

Not really what I was expecting,I'll get my coat....