Hi Guys,

Today my 51-plated Audi A3 TDI had a sudden loss of power whilst in 4th gear on the motorway.

I have done some research on here and it turns out it probably went into limp mode (i.e. I couldn't get above 3,000 revs no matter what).

However, what I would like to know is what is 'limp mode' and what causes it? Can anyone answer me this?

My theory is that my car went into 'limp mode' as I was very low on fuel at the time (I'm someone who always waits until the reserve light comes on before re-fuelling). If this low fuel level is what is the likely cause of the 'limp mode' then I will without a doubt change my attitude to fuel levels!

Thanks in advance!