Work step 6: Diagnostic of oxygen sensor heater

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When indicated on display

Fig 1: VAG 1551 Scan Tool Display - Work Step 6, Diagnostic Of Oxygen Sensor Heater (1 Of 2)

Courtesy of AUDI OF AMERICA, INC.

Press buttons -0-,-4-, and -1- to select "display group number 041" and confirm with -Q- button.

When indicated on display

Fig 2: VAG 1551 Scan Tool Display - Work Step 6, Diagnostic Of Oxygen Sensor Heater (2 Of 2)

Courtesy of AUDI OF AMERICA, INC.

Check specified value in display field 1 and 3:

NOTE: Increasing engine speed accelerates the obtaining of specified values.

DISPLAY GROUP 041: DISPLAY GROUP 041: OXYGEN SENSOR HEATER, BANK 1 AT IDLE

	Display fields
	1	2	3	4
Display group 041: Oxygen sensor heater, Bank 1 at idle
Display	xxx kOhm	Heater before TWC ON	xxx kOhm	Heater after TWC ON
Indicated	Bank 1, Sensor 1 internal resistance of sensor before TWC	Condition of heater	Bank 1, Sensor 2 internal resistance of sensor after TWC	Condition of heater
Work range		Heater before TWC ON Heater before TWC OFF		Heater after TWC ON Heater after TWC OFF
Specified Value	0 to 0.9 kOhm	Heater before TWC ON	0...0.9 kOhm	Heater after TWC ON
NOTE	NOTE : See note belowDISPLAY GROUP 042 DIAGNOSING OXYGEN SENSOR HEATER .		NOTE : See note belowDISPLAY GROUP 042 DIAGNOSING OXYGEN SENSOR HEATER .

Press -C- button.
Press buttons -0-, -4-, and -2- to select "display group number 042" and confirm input with -Q- button.

DISPLAY GROUP 042: OXYGEN SENSOR HEATER, BANK 2 AT IDLE

	Display fields
	1	2	3	4
Display group 042: Oxygen sensor heater, Bank 2 at idle
Display	xxx kOhm	Heater before TWC ON	xxx kOhm	Heater after TWC ON
Indicated	Bank 2, Sensor 1 internal resistance of sensor before TWC	Conditions of heater	Bank 2, Sensor 2 internal resistance of sensor after TWC	Condition of heater
Work range		Heater before TWC ON Heater before TWC OFF		Heater after TWC ON Heater after TWC OFF
Specified Value	0 to 0.9 kOhm	Heater before TWC ON	0 to 0.9 kOhm	Heater after TWC ON
NOTE	See note below		See note below

Important note for display groups 41 and 42: Display fields 1 and 3:

Display fields 1 and 3 will not indicate any value if the operating temperature of the oxygen sensors is not reached, that means both fields are empty. (Increase Engine Speed to reach specified value).
After the operating temperature is reached, the display fields 1 and 3 must display a value of less than 0,9 kOhm
Only proceed with test after value of less than 0,9 kOhm is displayed with in display fields 1 and 3.
- Press -C- button.