Operation 9: Catalytic converter diagnosis

WARNING: This page is about a different car, the 2003 Audi S6 and 2002 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

Indicated on display

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

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Enter "046" for "display group number 046" and confirm entry with Q key.

Display readout

Fig 2: VAG 1551 Scan Tool Display - Catalytic Converter Diagnosis (2 Of 2)

Courtesy of AUDI OF AMERICA, INC.

Increase engine speed to approx. 3000 rpm until the exhaust temperature 550 C (display zone 2) is reached, and then leave engine idling.

Check specification in display zone 4:

NOTE: The test duration for the catalytic converter diagnosis is approx. 60 seconds.

DISPLAY GROUP 046: CATALYTIC CONVERTER DIAGNOSIS (BANK 1)

	Display zones
	1	2	3	4
Display group 046: Catalytic converter diagnosis (bank 1)
Display	xxx rpm	xxx C	x.x s	---
Display	Engine speed	Exhaust gas temperature	Catalyst conversion	Diagnosis status
Range	min.: 550 rpm max.: 7200 rpm	70...850 °C	0.0...1.0 seconds	Test OFF Test ON Cat. B1 OK Cat. B1 NOK
Specified value	670...820 rpm	400...540 °C	0.0...0.73 s	Cat. B1 OK
Note:				If "Cat. B1 NOK" is displayed: Check DTC memory. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING . If no DTC is stored, replace the catalytic converter.

If the specified value in display zone 4 "Cat B1 OK" is attained:

Press C key.
Press keys 0, 4 and 7 for "display group number 47" and confirm entry with Q key.

DISPLAY GROUP 047: CATALYTIC CONVERTER DIAGNOSIS (BANK 2)

	Display zones
	1	2	3	4
Display group 047: Catalytic converter diagnosis (bank 2)
Display	xxx rpm	xxx C	x.x s	---
Display	Engine speed	Exhaust gas temperature	Catalyst conversion	Diagnosis status
Range	min.: 550 rpm max.: 7200 rpm	70...850 °C	0.0...1.0 seconds	Test OFF Test ON Cat. B2 OK Cat. B2 NOK
Specified value	670...820 rpm	400...540 °C	0.0...0.73 s	Cat. B2 OK
Note:				If "Cat. B2 NOK" is displayed: Check DTC memory . See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING . If no fault is stored, replace the catalytic converter .

If the specified value in display zone 4 "Cat B2 OK" is attained:

Press C key.