Hi,

Using Vag Com 409, i get the following Lambda sensor readings;

at idle;

group 006 = -7 and 18, group 008 = 5.5 and 2.3.

When i throttle (accelerate in neutral) to 2500rpm quickly, the lambda readings change to;

group 006 = 5.5 and -0.8, group 008 = 1.6 and 2.3 (the 2.3 reading does not change at all!)

Can anyone explain why there are 4 lambda readings and what these reading should be if the car is functionally normally?

Car is a 99 golf mk4 1.8T

Thx

What's your ECU part number?

Am not sure. Vag com provides me the following numbers;

Controller: 06A 906 018 R

Component: 1.8L R4/5VT MOTR HS D06

Is this what you was after?

Yeah, that's what I was looking for. Here's an excerpt from the AGU label file.

6,0,Idle Stabilisation - Spec figures at Idle

6,1,Idle speed,800-920 rpm

6,2,Idle reg,-10-10%

6,3,Lambda reg,-10-10%

6,4,Ign angle,6-12 BTDC

;

7,0,Lambda learned values

7,1,Lambda reg,-10-10%

7,2,Probe volts,0-1V

7,3,Valve duty,angle 0-99%

7,4,Correction,0.3-1.25

;

8,0,Lambda learned values

8,1,Inj. period,1-3 m/s

8,2,Idle learned,-10-10%

8,3,Learned,-8-8%

8,4,Vent mode

Thanks Sebastian.

Does this mean that the Lambda sensor is faulty? In group 8, the learned lambda readings do not change...stays at 2.3.

The symptoms i am seeing from the car is that the turbo is non existent! (8 - 50mph took 8secs in 2nd gear - maf read 116g/s at 6000rom).

Also fuel economy is really poor, 20mpg!