Work step 11: Diagnosis catalytic converter

WARNING: This page is about a different car, the 2004 Audi A6, 2003 Audi A6, 2002 Audi A6, 2001 Audi A6, and 2000 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

Increase engine speed to approximately 1800 to 2400/RPM.
Catalyst temperature greater than 540 °C display field 2.
Return engine to idle. Test starts when catalyst temperature falls below 540 °C but remains above 400 °C.

Indicated on display

Fig 1: VAG 1551 Scan Tool Display - Work Step 11, Diagnosis Catalytic Converter (1 Of 2)

Courtesy of AUDI OF AMERICA, INC.

Press button -0-, -4-, and -6- to select "display group number 046" and confirm input with -Q- button.

Indicated on display

Fig 2: VAG 1551 Scan Tool Display - Work Step 11, Diagnosis Catalytic Converter (2 Of 2)

Courtesy of AUDI OF AMERICA, INC.

Check specified value in display field 4.

NOTE: The test duration for catalytic converter diagnosis takes approximately 60 seconds.

DISPLAY GROUP 046: DIAGNOSTIC OF CATALYTIC CONVERTER (BANK 1)

	Display fields
	1	2	3	4
Display group 046: Diagnostic of catalytic converter (Bank 1)
Display	xxx/RPM	xxx °C	x.x s	-
Indicated	Engine speed (RPM)	Catalyst temperature	Catalytic converter conversion	Diagnostic condition
Work range	0 to 6800/RPM	70 to 850 °C	0.0 to 1.0 Seconds	Test OFF Test ON Cat B1 OK Cat B1 not OK
Values	1800 to 2400/RPM	greater than 400 °C less than 540 °C	0.0 to 0.55 seconds	Cat B1 OK
NOTE				If "Cat B1 not OK" is displayed: Check DTC memory . See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING . If no malfunction is stored replace catalytic converter.

If the specified value "Cat B1 OK" is reached:

Press -C- button
Press button -0-, -4-, and -7- to select "display group number 047" and confirm input with -Q- button.

DISPLAY GROUP 047: DIAGNOSTIC OF CATALYTIC CONVERTER (BANK 2)

	Display fields
	1	2	3	4
Display group 047: Diagnostic of catalytic converter (Bank 2)
Display	xxxx/RPM	xxx °C	x.x seconds	-
Indicated	Engine speed (RPM)	Catalyst temperature	Catalytic converter conversion	Diagnostic condition
Work range	0 to 6800/RPM	70 to 850 °C	0.0 to 1.0 Seconds	Test OFF Test ON Cat B2 OK Cat B2 not OK
Value	1800 to 2400/RPM	greater than 400 °C less than 540 °C	0.0 to 0.55 seconds	Cat B2 OK
NOTE				If "Cat B2 not OK" is displayed: Check DTC memory. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING . If no malfunction is stored replace catalytic converter.

If the specified value "Cat B2 OK" is reached:

Press -C- button