Work step 7: Diagnosis of oxygen sensor heater

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When indicated on display

Fig 1: VAG 1551 Scan Tool Display - Diagnosis Of Oxygen Sensor Heater (1 Of 2)

Courtesy of AUDI OF AMERICA, INC.

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

When indicated on display

Fig 2: VAG 1551 Scan Tool Display - Diagnosis 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: OXYGEN SENSOR HEATER, BANK 1

	Display fields
	1	2	3	4
Display group 041: Oxygen sensor heater, bank 1
Display	xxx kOhm	Heater before CAT ON	xxx kOhm	Heater after CAT ON
Indicated	Bank 1, Sensor 1	Condition of heater	Bank 1, Sensor 2	Condition of heater
Work range		Heater b. CAT ON Heater b. TWC OFF		Heater a. CAT ON Heater a. CAT OFF
Specified value	0 - 0.5 kOhm	Heater b. CAT ON/OFF	0 - 0.5 kOhm	Heater a. CAT ON/OFF

Important note for display fields 1,2,3 and 4:

Display fields 1 and 3 will not indicate any value if the operating temperature of the oxygen sensors is not reached, in which case 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 0.5k Ohm
Only proceed with test after value of less than 0.5k Ohm is displayed with in display fields 1 and 3 .
The Engine Control Module (ECM) cycles the oxygen sensor heating at certain operating conditions. This means the heater is under certain operating conditions ON or OFF. It is therefore possible that the specification in display field 2 and 4 appears periodically as "Heater b. CAT OFF" or "Heater a. CAT OFF"

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

DISPLAY GROUP 042: OXYGEN SENSOR HEATER, BANK 1

	Display fields
	1	2	3	4
Display group 042: Oxygen sensor heater, bank 1
Display	xxx kOhm	Heater before CAT ON	xxx kOhm	Heater after CAT ON
Indicated	Bank 1, Sensor 1	Condition of heater	Bank 1, Sensor 2	Condition of heater
Work range		Heater b. CAT ON Heater b. TWC OFF		Heater a. CAT ON Heater a. CAT OFF
Specified value	0 - 0.5 kOhm	Heater b. CAT ON/OFF	0 - 0.5 kOhm	Heater a. CAT ON/OFF
Note	Observe note below		Observe note below

Important note for display fields 1,2,3 and 4:

Display fields 1 and 3 will not indicate any value if the operating temperature of the oxygen sensors is not reached, in which case 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 0.5k Ohm
Only proceed with test after value of less than 0.5k Ohm is displayed with in display fields 1 and 3 .
The Engine Control Module (ECM) cycles the oxygen sensor heater at certain operating conditions. This means the heater is under certain operating conditions ON or OFF. It is therefore possible that the specification in display field 2 and 4 appears periodically as "Heater b. CAT OFF" or "Heater a. CAT OFF"

Press -C- button.