bostonS6

Hi, do late model audi's, like my S6, operate open loop on predetermined fueling table or is it closed loop even on WOT?

thanks

germantoy

what year ? im pretty sure if your running motronic there is always open loop signal coming from the o2/egt sensor.

bagodoosh

you can easily verify this with an OBD2 reader. you won't need a VAG-COM necessarily. one of the OBD2 data parameters shows whether the fuel system is CLOSED or OPEN.

i imagine it's OPEN however it may still use long term fuel trims. i've seen this trend with some car manufacturers.

bostonS6

According to technical manuals, it is actually a mix. It uses long term fuel trim, and also takes feedback from TPS, Intake air temp, knock sensors, and the new LSU wideband/planar linear oxygen sensors used in new audi's.

bostonS6

2008. it is different in MED 9 than in ME 7 and previous cars...