B1S1 and B2S1 rich / lean

A6 All/ S6 All
#1

Finished putting back together an 07 S6. New HPFPs due to low pressure, wouldnt run over 40 mph before. Now it runs good, great power etc. But just had B2S1 lambda rich, and B2S1 lambda lean codes pop up. Also B2S1 slow to respond.
It has 8 brand new bosch lambda sensors. Only thing not replaced were the injectors.

-Is it possible I switched the connectors for B1 and B2? If so this would suck as the connectors are not accessible with everything up in the car !

-Without just throwing new injectors at it, can I check somehow it is the injectors? Havent checked fuel trims yet will check tomorrow. STFTs should show if its an air leak too.

Just spitballing while Im stuck at work for the day.

#2

I always get confused how to monitor the trims on the quad bank cars.
Which channel number do I need to be looking at to see B1 and B2 short term fuel trims?

#3

Under Engine (module 1) - group 33 is short term fuel trims for banks 1 & 2 (cyls 1-5)
fields:
1 bank 1 - (cyls 1-3) lambda control %
2 bank 1 - (cyls 1-3) sensor voltage
3 bank 2 - (cyls 4 & 5) lambda control %
4 bank 2 - (cyls 4 & 5) sensor voltage

Under Engine II (module 11) - group 33 is short term fuel trims for banks 3 & 4 (cyls 6-10)
fields:
1 bank 3 - (cyls 6-8) lambda control %
2 bank 3 - (cyls 6-8) sensor voltage
3 bank 4 - (cyls 9 & 10) lambda control %
4 bank 4 - (cyls 9 & 10) sensor voltage

Your LTFTs are in group 32

Fuel trims short and long term
Rough driving issues
#4

Perfect thanks.
I wish the advanced measure values worked on the dual ECU cars, would make things so much easier to see all at once

#5

I believe if you use module 31 [engine other] and select group 33, it will bring up two rows of fields

#6

Helpful post. Might be a good idea to make a stand alone post on something like this. Lots of questions about fuel trims logging blocks and such.