2009 Audi Q7 TDI - Fuel trim code?

Hey guys,

Just wanted to run this by you, i got a code for Fuel trim too lean on a diesel.
Never seen this on a diesel before, typical gasoline engine code yes, but on a diesel?
Can someone explain why would it care about fuel trim?

Thanks

tuningbyamg said:

Can someone explain why would it care about fuel trim?

Click to expand...

To keep the NOx emissions under control. If it runs too lean, more NOx is produced.

-Uwe-

Riiight, then until the recall it shall wait