Work Step 6: Diagnostic of Heated Oxygen Sensor Audi A8 D3

When indicated on display

Scheme 114

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

When indicated on display

Scheme 115

1. 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 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 behind TWC ON Indicated Bank 1, Sensor 1 internal resistance of sensor before TWC that creates sensor voltage Condition of heater Bank 1, Sensor 2 internal resistance of sensor behind TWC that creates sensor voltage Condition of heater Work range Heater before TWC ON Heater behind TWC ON Heater before TWC OFF Heater behind TWC OFF Value 0 to 0.9 kOhm Heater before TWC ON 0 to 0.9 kOhm Heater behind TWC ON Note See the Note underneath «DISPLAY FIELDS OXYGEN SENSOR HEATER, BANK 2 CHART»(ref-216437-S40698358412006020800000) See the Note underneath «DISPLAY FIELDS OXYGEN SENSOR HEATER, BANK 2 CHART»(ref-216437-S40698358412006020800000)
2. Press -C- button.
3. 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

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

1. 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).
2. After the operating temperature is reached, the display fields 1 and 3 must display a value of less than 0.9kOhm
3. Oxygen sensor control of oxygen sensor behind Catalytic Converter (Bank 1; Sensor 2 and Bank 2; Sensor 2 is not active without engine load.
4. Only proceed with test after value of less than 0.9kOhm is displayed with in display fields 1 and 3.

1. Press -C- button.