I'm getting an EML on my 5.0 supercharged. It been reset twice an is now back on again. The fault is fuel trim on Bank 2.

I've been running it on 99 RON and the last couple off tanks have also added a Forte treatment, no change.

My indy suggests MAF, blocked air filter, he's even found a rats nest in the air filter on another car, that caused the EML to come on.

The supplying dealer is taking tge car back to sort it, once and for all.

Any suggestions as to what else could cause a fuel trim issue.

All suggestions welcome and I will pass on to the dealer. 2017 5.0 Autobiography Supercharged
2005 Merc SL350
2005 Disco HSE 2.7 oil burner