Operation 5: Checking operating status of oxygen sensor control

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Start engine (for vehicles with manual transmission: press clutch pedal).

NOTE: If necessary, after the engine starts reselect vehicle system "01 - Engine electronics" and diagnostic function "04 - Basic setting".

Test conditions

Engine running at idling speed

Fig 1: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS5051:

1 - Enter display group

Max. input value = 255

Enter "030" for "display group number 030" in zone -2- and confirm entry by pressing -Q- button.

Fig 2: Diagnostic System VAS 5051: Display - Display Fields

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS5051:

Activate basic setting by pressing -A- button.
Check indication in display fields -1- to -4-.

NOTE:

By increasing the engine speed the specified values are achieved more quickly.
The "oxygen sensor status" indicates the condition of the oxygen sensor control and the oxygen sensors.

	Display zones
	1	2	3	4
Display group 030: Oxygen sensor status
Display	X X X X X	X X X X	X X X X X	X X X X
Display	Oxygen sensor status, Bank 1, Sensor 1	Oxygen sensor status, Bank 1, Sensor 2	Oxygen sensor status, Bank 2, Sensor 1	Oxygen sensor status, Bank 2, Sensor 2
Range	0 = off 1 = on	0 = off 1 = on	0 = off 1 = on	0 = off 1 = on
Specif. value	1 1 1	1 1 0	1 1 1	1 1 0

Significance of last 3 digits in readout of display group 030
X	X	X	Display zones 1...4
X			Condition of oxygen sensor heating: 0 = not active; 1 = active
	X		Oxygen sensor condition: 0 = not active; 1 = active
		X	Oxygen sensor (O2S) control 0 = not active; 1 = active

NOTE:

The first digit of the relevant 3-digit display (heating) fluctuates between 0 and 1.
The oxygen sensor control for oxygen sensor behind catalytic converter (Bank 1, Sensor 2 and Bank 2, Sensor 2) is not active without engine load, i.e. the last digit of the 3-digit display is 0.

Continue test when displays have achieved "111" in display zones 1 and 3 and "110" in display zones 2 and 4.
Press ← button.
Perform next operation.