1999 Audi A6 Quattro emission

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Condition	Value

expand_moreDiesel exhaust gas values

expand_moreCut-off control speed


All Audi diesel V6 2.5 L AFB engines	4500–5500 rpm4500–5500 rpm4500–5500 rpm
All Audi diesel V6 2.5 L AKN engines	4500–5500 rpm4500–5500 rpm4500–5500 rpm

expand_moreAll other modifications


AKE engine	4500–5500 rpm4500–5500 rpm4500–5500 rpm
Otherwise	4650–4950 rpm4650–4950 rpm4650–4950 rpm


Diesel conditioning gas injections	10
from 60° C engine oil temperature

expand_moreDiesel conditioning speed


All Audi diesel V6 2.5 L AFB engines	4500–5500 rpm4500–5500 rpm4500–5500 rpm
from 60° C engine oil temperature
All Audi diesel V6 2.5 L AKN engines	4500–5500 rpm4500–5500 rpm4500–5500 rpm
from 60° C engine oil temperature

expand_moreAll other modifications


AKE engine	4500–5500 rpm4500–5500 rpm4500–5500 rpm
from 60° C engine oil temperature
Otherwise	4650–4950 rpm4650–4950 rpm4650–4950 rpm
from 60° C engine oil temperature


Maximum K-value	2 1/m2 1/m2 1/m
Measuring mode	B
Measuring sensor	1

expand_moreMeasuring time


All Audi diesel V6 2.5 L AFB engines	2 s2 s2 s
All Audi diesel V6 2.5 L AKN engines	2 s2 s2 s
All other modifications	0.5 s0.5 s0.5 s


Stoppage time	1 s1 s1 s

expand_moreGeneral exhaust gas values


Diagnostic socket location	The diagnostic socket is at the lower edge of the dashboard on the driver's side.

expand_moreIdling speed with automatic gearbox


Audi diesel V6 2.5 L AFB 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM	680–860 rpm680–860 rpm680–860 rpm
Audi diesel V6 2.5 L AKN 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM	680–860 rpm680–860 rpm680–860 rpm

expand_moreAudi gasoline straight-4 1.8 L AEB 148 HP, 210 N⋅m


AEB engine	820–900 rpm820–900 rpm820–900 rpm
ANB engine	800–920 rpm800–920 rpm800–920 rpm
APU engine	800–920 rpm800–920 rpm800–920 rpm
AWT engine	740–880 rpm740–880 rpm740–880 rpm


Audi gasoline V6 2.4 L APZ 161 HP	670–850 rpm670–850 rpm670–850 rpm
Audi gasoline V6 2.4 L AJG 161 HP	670–850 rpm670–850 rpm670–850 rpm

expand_moreAudi gasoline V6 2.4 L ALF 162 HP


AGA engine	670–850 rpm670–850 rpm670–850 rpm
ALF engine	670–850 rpm670–850 rpm670–850 rpm
AML engine	670–770 rpm670–770 rpm670–770 rpm
APS engine	650–770 rpm650–770 rpm650–770 rpm
ARJ engine	650–770 rpm650–770 rpm650–770 rpm


Audi gasoline straight-4 1.8 L AJL 177 HP	820–900 rpm820–900 rpm820–900 rpm
Audi gasoline V6 2.8 L ATX 188 HP	740–860 rpm740–860 rpm740–860 rpm
Audi gasoline V6 2.7 L AJK 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	660–800 rpm660–800 rpm660–800 rpm
Audi gasoline V6 2.7 L AZA 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	660–800 rpm660–800 rpm660–800 rpm
Audi gasoline V8 3.7 L AQG 256 HP at 6000 RPM, 350 N⋅m at 3250 RPM	670–730 rpm670–730 rpm670–730 rpm

expand_moreAudi gasoline V8 4.2 L ARS 295 HP


ARS engine	650–750 rpm650–750 rpm650–750 rpm
ASG engine	670–820 rpm670–820 rpm670–820 rpm

expand_moreAll other modifications


ACK engine	640–760 rpm640–760 rpm640–760 rpm
ALG engine	660–780 rpm660–780 rpm660–780 rpm
AMX engine	630–770 rpm630–770 rpm630–770 rpm
APR engine	650–750 rpm650–750 rpm650–750 rpm
AQD engine	670–770 rpm670–770 rpm670–770 rpm

expand_moreIdling speed with manual gearbox


Audi diesel V6 2.5 L AFB 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM	680–860 rpm680–860 rpm680–860 rpm
Audi diesel V6 2.5 L AKN 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM	680–860 rpm680–860 rpm680–860 rpm

expand_moreAudi gasoline straight-4 1.8 L AEB 148 HP, 210 N⋅m


AEB engine	820–900 rpm820–900 rpm820–900 rpm
ANB engine	740–860 rpm740–860 rpm740–860 rpm
APU engine	740–860 rpm740–860 rpm740–860 rpm
AWT engine	740–880 rpm740–880 rpm740–880 rpm


Audi gasoline V6 2.4 L APZ 161 HP	670–850 rpm670–850 rpm670–850 rpm
Audi gasoline V6 2.4 L AJG 161 HP	670–850 rpm670–850 rpm670–850 rpm

expand_moreAudi gasoline V6 2.4 L ALF 162 HP


AGA engine	670–850 rpm670–850 rpm670–850 rpm
ALF engine	670–850 rpm670–850 rpm670–850 rpm
AML engine	670–770 rpm670–770 rpm670–770 rpm
APS engine	650–770 rpm650–770 rpm650–770 rpm
ARJ engine	650–770 rpm650–770 rpm650–770 rpm


Audi gasoline straight-4 1.8 L AJL 177 HP	820–900 rpm820–900 rpm820–900 rpm
Audi gasoline V6 2.8 L ATX 188 HP	640–760 rpm640–760 rpm640–760 rpm
Audi gasoline V6 2.7 L AZA 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	660–800 rpm660–800 rpm660–800 rpm
Audi gasoline V6 2.7 L AJK 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	660–800 rpm660–800 rpm660–800 rpm
Audi gasoline V8 3.7 L AQG 256 HP at 6000 RPM, 350 N⋅m at 3250 RPM	670–730 rpm670–730 rpm670–730 rpm

expand_moreAll other modifications


ACK engine	640–760 rpm640–760 rpm640–760 rpm
ALG engine	660–780 rpm660–780 rpm660–780 rpm
AMX engine	630–770 rpm630–770 rpm630–770 rpm
APR engine	650–750 rpm650–750 rpm650–750 rpm
AQD engine	670–770 rpm670–770 rpm670–770 rpm


Minimum engine oil temperature at VET	176°F176°F80°C

expand_morePetrol exhaust gas values

expand_moreCO content at idling speed


Audi gasoline V6 2.8 L ATX 188 HP	0.5 %0.5 %0.5 %
Audi gasoline V8 3.7 L AQG 256 HP at 6000 RPM, 350 N⋅m at 3250 RPM	0.5 %0.5 %0.5 %
All other modifications	0–0.5 %0–0.5 %0–0.5 %

expand_moreCO content at increased idling speed


Audi gasoline V6 2.8 L ATX 188 HP	0.3 %0.3 %0.3 %
Audi gasoline V8 3.7 L AQG 256 HP at 6000 RPM, 350 N⋅m at 3250 RPM	0.3 %0.3 %0.3 %
All other modifications	0–0.3 %0–0.3 %0–0.3 %


Delta lambda	0.03 λ0.03 λ0.03 λ

expand_moreIncreased idling speed

expand_moreAudi gasoline V6 2.8 L ALG 190 HP at 6000 RPM, 280 N⋅m at 3200 RPM


AMX engine	2500–3200 rpm2500–3200 rpm2500–3200 rpm
Otherwise	2500–2800 rpm2500–2800 rpm2500–2800 rpm

expand_moreAudi gasoline V8 4.2 L ARS 295 HP


ARS engine	2500–2800 rpm2500–2800 rpm2500–2800 rpm
ASG engine	2500–3200 rpm2500–3200 rpm2500–3200 rpm


All other modifications	2500–2800 rpm2500–2800 rpm2500–2800 rpm

expand_moreLambda sensor design

expand_moreAudi gasoline straight-4 1.8 L AEB 148 HP, 210 N⋅m


AWT engine	wideband sensor

expand_moreAudi gasoline V6 2.4 L ALF 162 HP


AML engine	Jump type lambda sensor

expand_moreAudi gasoline V8 4.2 L ARS 295 HP


ASG engine	Jump type lambda sensor

expand_moreAll other modifications


AMX engine	Jump type lambda sensor


Lambda value	0.97–1.03 λ0.97–1.03 λ0.97–1.03 λ

expand_moreMaximum HC content at idling


Audi gasoline straight-4 1.8 L ANB 148 HP	70 ppm70 ppm70 ppm
Audi gasoline straight-4 1.8 L APU 148 HP	70 ppm70 ppm70 ppm
Audi gasoline straight-4 1.8 L AWT 148 HP	70 ppm70 ppm70 ppm
Audi gasoline straight-4 1.8 L ARK 148 HP at 5700 RPM, 210 N⋅m at 1750 RPM	70 ppm70 ppm70 ppm
Audi gasoline straight-4 1.8 L AEB 148 HP, 210 N⋅m	70 ppm70 ppm70 ppm
Audi gasoline straight-4 1.8 L AJL 177 HP	70 ppm70 ppm70 ppm
Audi gasoline V6 2.7 L AJK 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	70 ppm70 ppm70 ppm
Audi gasoline V6 2.7 L AZA 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	70 ppm70 ppm70 ppm
Audi gasoline V8 3.7 L AQG 256 HP at 6000 RPM, 350 N⋅m at 3250 RPM	70 ppm70 ppm70 ppm
All other modifications	100 ppm100 ppm100 ppm

expand_morePetrol conditioning speed

expand_moreAudi gasoline V6 2.8 L ALG 190 HP at 6000 RPM, 280 N⋅m at 3200 RPM


AMX engine	2500–3200 rpm2500–3200 rpm2500–3200 rpm
Otherwise	2500–2800 rpm2500–2800 rpm2500–2800 rpm


Audi gasoline V8 4.2 L AWN 295 HP	2500–3200 rpm2500–3200 rpm2500–3200 rpm
Audi gasoline straight-8 4.2 L ASG 295 HP	2500–3200 rpm2500–3200 rpm2500–3200 rpm
Audi gasoline V8 4.2 L ARS 295 HP	2500–3200 rpm2500–3200 rpm2500–3200 rpm
All other modifications	2500–2800 rpm2500–2800 rpm2500–2800 rpm


Petrol conditioning time	120 s120 s120 s

expand_moreSpeed for disturbance variable

expand_moreAudi gasoline straight-4 1.8 L AEB 148 HP, 210 N⋅m


AEB engine	720–1000 rpm720–1000 rpm720–1000 rpm

expand_moreANB engine


With automatic gearbox	700–1020 rpm700–1020 rpm700–1020 rpm
With manual transmission	640–960 rpm640–960 rpm640–960 rpm

expand_moreAPU engine


With automatic gearbox	700–1020 rpm700–1020 rpm700–1020 rpm
With manual transmission	640–960 rpm640–960 rpm640–960 rpm


Audi gasoline V6 2.4 L APZ 161 HP	570–950 rpm570–950 rpm570–950 rpm
Audi gasoline V6 2.4 L AJG 161 HP	570–950 rpm570–950 rpm570–950 rpm

expand_moreAudi gasoline V6 2.4 L ALF 162 HP


AGA engine	570–950 rpm570–950 rpm570–950 rpm
ALF engine	570–950 rpm570–950 rpm570–950 rpm
APS engine	550–870 rpm550–870 rpm550–870 rpm
ARJ engine	550–870 rpm550–870 rpm550–870 rpm


Audi gasoline straight-4 1.8 L AJL 177 HP	720–1000 rpm720–1000 rpm720–1000 rpm
Audi gasoline V6 2.7 L AJK 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	560–900 rpm560–900 rpm560–900 rpm
Audi gasoline V6 2.7 L AZA 227 HP at 5800 RPM, 310 N⋅m at 1700 RPM	560–900 rpm560–900 rpm560–900 rpm

expand_moreAudi gasoline V8 4.2 L ARS 295 HP


ARS engine	550–850 rpm550–850 rpm550–850 rpm

expand_moreAll other modifications


ACK engine	540–860 rpm540–860 rpm540–860 rpm
ALG engine	560–880 rpm560–880 rpm560–880 rpm
APR engine	550–850 rpm550–850 rpm550–850 rpm
AQD engine	570–870 rpm570–870 rpm570–870 rpm

expand_moreTest speed for lambda sensor signal

expand_moreAudi gasoline straight-4 1.8 L AEB 148 HP, 210 N⋅m


AWT engine	740–880 rpm740–880 rpm740–880 rpm

expand_moreAudi gasoline V6 2.4 L ALF 162 HP


AML engine	670–770 rpm670–770 rpm670–770 rpm

expand_moreAudi gasoline V8 4.2 L ARS 295 HP


ASG engine	670–820 rpm670–820 rpm670–820 rpm

expand_moreAll other modifications


AMX engine	630–770 rpm630–770 rpm630–770 rpm

expand_moreVoltage swing at test speed

expand_moreAudi gasoline V6 2.4 L ALF 162 HP


AML engine	0.3 V0.3 V0.3 V
More than

expand_moreAudi gasoline V8 4.2 L ARS 295 HP


ASG engine	0.3 V0.3 V0.3 V
More than

expand_moreAll other modifications


AMX engine	0.3 V0.3 V0.3 V
More than

To reduce environment impact and pass government inspections keep emission parameters at the level prescribed by Audi.

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 1999 Audi A6 Quattro user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.

Before doing any DIY service please check your insurance policy and Audi warranty policy for your region. In some regions DIY service may invalidate your warranty.

Maintenance Items

Service Intervals

Conquer your fears and never give up!

DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Audi A6 Quattro service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.

Doing basic service for your 1999 Audi A6 Quattro you're not only saving money, but also also improving your technical skills and learning something new.

1999 Audi A6 Quattro C5 Emission

Table of Contents

Conquer your fears and never give up!

Audi A6 Quattro C5 model years

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