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I pulled my DTC's this weekend and had that fault (B5 RS4)

"Lamba Sensor, internal ressistance to high"

Does someone had this before? Seems to be something about the heating of the sensor?

Regarding to my problem http://www.rs246.com/index.php?name=PNp ... 4&start=15

The car seems to go fast with lets say 90% throttle than with 100%.

I don't know where to start, can somebody help, i can read blocks but with VAG 1551 or VAS5051, i don't have VAG-com

sensors have heating built in, likely replacing the bad sensor will fix it. there are 4 sensors 2 for each bank so make sure you change the right one.

relating to Ohms law, if the resistance goes up and the voltage remains the same then the amps would go down.

not being too familier with the operation of the ECU i would guess that if the amps dropped then there wouldn't be enough current flowing to ignite the Lambda so the ECU would receive an improbable reading back from the probe. this may or may not result in limp mode, i'm not sure how it would deal with it. i'm sure someone will be along soon to put me right.