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In my Audi 100 Sport with ABY-engine I have the following problems:

Turboboost is low and fuel usage is up. At first pull I got these codes:


00537 - Lambda (Oxygen Sensor) Regulation

08-10 - Control Limit Surpassed - Intermittent

00525 - Oxygen (Lambda) Sensor (G39)

29-00 - Short to Ground

00561 - Mixture Adaptation

12-00 - Adaptation Limit (Mul) Exceeded


Replaced lambda sensor with a new unit

Took a small trip, got these codes


00537 - Lambda (Oxygen Sensor) Regulation

08-10 - Control Limit Surpassed - Intermittent

00525 - Oxygen (Lambda) Sensor (G39)

29-00 - Short to Ground

01250 - Fuel Injector for Cylinder 2 (N31)

31-10 - Open or Short to Ground - Intermittent

Checked earth points on intake and cleaned them with my dremel


Took a small trip


Now I got only this code

00525 - Oxygen (Lambda) Sensor (G39)

29-00 - Short to Ground
What could be wrong?
The car sometimes hesitates a bit, probably related to the 01250-code?