Operation 9: Diagnosis of tank seal and oxygen sensor interchange recognition behind catalytic converter

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.

Test conditions

For ECM up to Part No. 8E0 909 559D, software version D0003:

Engine running at idling speed

For ECM Part No. 8E0 909 559D, from software version D0004 and ECM 8E0 909 559E, from software version D0001:

Accelerator and brake pedals fully pressed simultaneously and held in this position until a test result is displayed

Fig 1: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS5051:

1 - Enter display group

Enter "196" for "display group number 196" 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- and -4-.

NOTE:

Tank leak diagnostic lasts longer than the oxygen sensor interchange recognition.
In case diagnostic leak test is not started, open fuel filler cap briefly (to release pressure).

CAUTION:

Depending on the software status of the ECM, the engine should be running in idle or with increased RPM for interchange recognition.
If the interchange recognition does not start in display field 4, press down on the accelerator and brake pedals simultaneously. This increases the engine speed to approx. 1500 RPM and starts the test.

	Display zones
	1	2	3	4
Display group 196: Tank leak diagnosis and oxygen sensor interchange recognition (Bank 1, Sensor 2 - Bank 2, Sensor 2)
Display	xxxx RPM	xxx°C	x.xxx V	---
Display	Diagnosis status Tank leak	Oxygen sensor voltage Bank 1, Sensor 2	Oxygen sensor voltage Bank 2, Sensor 2	Diagnosis status Oxygen sensor activation
Range	Test OFF Test ON Syst. OK Syst. NOK			Test OFF Test ON Syst. OK Syst. NOK
Specified value	Syst. OK	0.100...0.950 V	0.100...0.950 V	Syst. OK
Note:	If "Syst. NOK" is displayed: Check DTC memory. Refer to Diagnostic Trouble Code (DTC) memory, checking			If "Syst. NOK" is displayed: Check routing of oxygen sensor wires

If the specified value "Syst. OK" is obtained:

Press ← button.
Perform next operation.