Hello,

so recently I came into problem with my 2012 XF. It runs great when cold but since the weather is very hot currently it starts to hesitate on low rpm and part throttle. Also it is loosing low end power as well.

Once I got an error P0101-00
PCM Mass or volume air flow - circuit range/performance
Cleaned both mafs so no codes but car still runs awful when hot.
Today I wanted to check fuel trims but they seem very odd:


If I select long term - I see blank rows with no info.
What do you guys think? Maybe replace both MAFs?
Current mileage is 75k miles

 

 

I would very much check the hoses under the engine cover, you might have a vacuum leak from one of them.

 

So the weather now is much cooler and car runs just fine.
I tried to use some brake cleaner around all vac hoses while engine is running - seems that I do bit have a leak...