	Display zones
	1	2	3	4
Display group 032: Oxygen sensor learned values before catalytic converter
Display	Xx.x%	Xx.x%	Xx.x%	Xx.x%
Display	Oxygen sensor learned value Bank 1 at idle (additive)	Oxygen sensor learned value, Bank 1, at part load (multiplicative)	Oxygen sensor learned value Bank 2 at idle (additive)	Oxygen sensor learned value Bank 2 at part load (multiplicative)
Specif. value	4.0 to 4.0%	10.0 to 10.0%	4.0 to 4.0%	10.0 to 10.0%
Note	If the specification is not obtained. Refer to Evaluating display group 032

Press <-- button.

Display on VAS5051

1 - Enter display group

Enter "033" for "display group number 033" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

Activate basic setting by pressing -A- button.
Check indication in display fields -1- to -4-.

	1	2	3	4
Display group 033: Oxygen sensor control before catalytic converter
Display	Xx.x%	X.xxx V	Xx.x%	X.xxx V
Display	Oxygen sensor control Bank 1, sensor 1	Oxygen sensor voltage Bank 1, sensor 1	Oxygen sensor control Bank 1, sensor 2	Oxygen sensor voltage Bank 1, sensor 2
Specif. value	In range -10.0 to 10.0% value must fluctuate at least 2%	1.400 to 1.600 V	In range -10.0 to 10.0% value must fluctuate at least 2%	1.400 to 1.600 V
Note	If specified value is not obtained Continuation. Refer to Checking oxygen sensor learned values and oxygen sensor control	If specified value is not achieved Evaluation display group 033: Refer to Evaluating display group 033	If specified value is not obtained Continuation. Refer to Checking oxygen sensor learned values and oxygen sensor control	If specified value is not achieved Evaluation display group 033: Refer to Evaluating display group 033

Note on display zones 2 and 4

Displayed is the oxygen sensor voltage signal which was prepared and smoothed in the engine control module. 1.5 V in the display corresponds to oxygen sensor 1 (with the engine at operating temperature without secondary air system influence).

Exit function "04 - Basic setting" by pressing <-- button.

(cont.)

If specification is not obtained in display zone 1 or display zone 3, or if the value does not fluctuate by at least 2%

Perform drive test to free oxygen sensors from any possible residues and repeat test.

If the specified result is not achieved in display zones 1 or 3, or if the value does not fluctuate by at least 2%, even after the test drive

Check basic voltage. Refer to «Checking basic voltage»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__checking-basic-voltage) .
Check oxygen sensor heating before catalytic converter. Refer to «Oxygen sensors before catalytic converter, checking heating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
Check oxygen sensor before catalytic converter for aging. Refer to «Oxygen sensors before catalytic converter, checking aging»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-before-catalytic-converter-checking) .

Display zone: 1/3 or 2/4	Possible causes of malfunction	Corrective action
Oxygen sensor learned Values below specified range	Oil dilution	Perform oil change or drive vehicle fairly fast on out-of-town roads
	High oil consumption
	Mass air flow (MAF) sensor faulty	Test mass air flow (MAF) sensor. Refer to Mass Air Flow (MAF) sensor -G70-, checking .
	Evaporative emission (EVAP) canister purge regulator valve stuck open	Check Evaporative Emission (EVAP) canister purge regulator valve. Refer to Evaporative Emission (EVAP) canister purge regulator valve -N80-, checking .
	Fuel pressure too high	Check fuel system pressure. Refer to Fuel pressure regulator and holding pressure (vehicles up to 06.03), checking
	Injector not closing	Check injectors. Refer to Fuel injectors, checking
	Oxygen sensor heating faulty Oxygen sensor faulty	Check oxygen sensor heating. Refer to Oxygen sensors before catalytic converter, checking heating .

Evaluating display group 032

Display zone: 1/3 or 2/4	Possible causes of malfunction	Corrective action
Oxygen sensor learned values above specified range	Unmetered air in intake area	Check intake system for leaks and correct unmetered air. Refer to Intake air system for leaks (unmetered air), checking
	Fuel pressure too low	Check fuel system pressure. Refer to Fuel pressure regulator and holding pressure (vehicles up to 06.03), checking
	Mass air flow (MAF) sensor faulty	Test mass air flow (MAF) sensor. Refer to Mass Air Flow (MAF) sensor -G70-, checking
	Oxygen sensor heating faulty Oxygen sensor faulty	Check oxygen sensor heating. Refer to Oxygen sensors before catalytic converter, checking heating
	Injector only opens partially or not at all	Check injectors. Refer to Fuel injectors, checking
	Evaporative emission (EVAP) canister purge regulator valve sticking	Check EVAP canister purge regulator valve. Refer to Evaporative Emission (EVAP) canister purge regulator valve -N80-, checking

Evaluating display group 032

Display zone: 2/4	Possible causes of malfunction	Corrective action
Greater than 4.800 V	Short to positive in wiring between oxygen sensor and control module Oxygen sensor faulty	Check wiring of oxygen sensors before catalytic converter. Refer to Oxygen sensors and oxygen sensor control before catalytic converter, checking
Less than 0.130 V	Short to Ground in wiring between oxygen sensor and control module Oxygen sensor faulty	Replace oxygen sensor before catalytic converter

Evaluating display group 033

Checking oxygen sensor learned values and oxygen sensor control Audi A4 B6

Checking oxygen sensor learned values and oxygen sensor control

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