1998 Audi A4 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
All other modifications	4800–5200 rpm4800–5200 rpm4800–5200 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
All other modifications	4800–5200 rpm4800–5200 rpm4800–5200 rpm
from 60° C engine oil temperature


Maximum K-value	2 1/m2 1/m2 1/m
Measuring mode	B
Measuring sensor	1
Measuring time	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 located in the central console next to the ashtray.

expand_moreIdling speed with automatic gearbox


All Audi gasoline V6 2.6 L ABC engines	680–820 rpm680–820 rpm680–820 rpm

expand_moreAll Audi gasoline straight-4 1.8 L ADR engines


ADR engine	820–900 rpm820–900 rpm820–900 rpm
APT engine	770–870 rpm770–870 rpm770–870 rpm
ARG engine	770–870 rpm770–870 rpm770–870 rpm

expand_moreAll Audi gasoline straight-4 1.8 L AEB engines


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


All Audi diesel V6 2.5 L AFB engines	680–860 rpm680–860 rpm680–860 rpm

expand_moreAll Audi diesel straight-4 1.9 L AFN engines


AFN engine	780–900 rpm780–900 rpm780–900 rpm
AVG engine	760–900 rpm760–900 rpm760–900 rpm


All Audi gasoline straight-4 1.8 L AFY engines	780–900 rpm780–900 rpm780–900 rpm

expand_moreAll Audi gasoline V6 2.4 L AGA engines


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


All Audi diesel V6 2.5 L AKN engines	680–860 rpm680–860 rpm680–860 rpm

expand_moreAll other modifications


ACK engine	640–760 rpm640–760 rpm640–760 rpm
ALG engine	620–740 rpm620–740 rpm620–740 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


All Audi gasoline V6 2.6 L ABC engines	680–820 rpm680–820 rpm680–820 rpm

expand_moreAll Audi gasoline straight-4 1.8 L ADR engines


ADR engine	820–900 rpm820–900 rpm820–900 rpm
APT engine	810–910 rpm810–910 rpm810–910 rpm
ARG engine	810–910 rpm810–910 rpm810–910 rpm

expand_moreAll Audi gasoline straight-4 1.8 L AEB engines


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


All Audi diesel V6 2.5 L AFB engines	680–860 rpm680–860 rpm680–860 rpm

expand_moreAll Audi diesel straight-4 1.9 L AFN engines


AFN engine	780–900 rpm780–900 rpm780–900 rpm
AVG engine	760–900 rpm760–900 rpm760–900 rpm


All Audi gasoline straight-4 1.8 L AFY engines	780–900 rpm780–900 rpm780–900 rpm

expand_moreAll Audi gasoline V6 2.4 L AGA engines


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


All Audi gasoline straight-4 1.8 L AJL engines	820–900 rpm820–900 rpm820–900 rpm
All Audi diesel V6 2.5 L AKN engines	680–860 rpm680–860 rpm680–860 rpm

expand_moreAll other modifications


ACK engine	640–760 rpm640–760 rpm640–760 rpm
ALG engine	620–740 rpm620–740 rpm620–740 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


All Audi gasoline straight-4 1.8 L AFY engines	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


All Audi gasoline straight-4 1.8 L AFY engines	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_moreAll Audi gasoline V6 2.8 L ACK engines


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

expand_moreAll Audi gasoline straight-4 1.8 L AEB engines


AWT engine	2500–3000 rpm2500–3000 rpm2500–3000 rpm
Otherwise	2500–2800 rpm2500–2800 rpm2500–2800 rpm

expand_moreAll Audi gasoline V6 2.4 L AGA engines


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


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

expand_moreLambda sensor design

expand_moreAll Audi gasoline straight-4 1.8 L AEB engines


AWT engine	wideband sensor


All Audi gasoline V6 2.4 L AGA engines	Jump type lambda sensor
All Audi gasoline V6 2.4 L ALF engines	Jump type lambda sensor
All Audi gasoline V6 2.4 L AML engines	Jump type lambda sensor
All Audi gasoline V6 2.4 L APS engines	Jump type lambda sensor
All Audi gasoline V6 2.4 L ARJ engines	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
Maximum HC content at idling	100 ppm100 ppm100 ppm

expand_morePetrol conditioning speed

expand_moreAll Audi gasoline V6 2.8 L ACK engines


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

expand_moreAll Audi gasoline straight-4 1.8 L AEB engines


AWT engine	2500–3000 rpm2500–3000 rpm2500–3000 rpm

expand_moreAll Audi gasoline V6 2.4 L AGA engines


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


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

expand_morePetrol conditioning time


All Audi gasoline V6 2.6 L ABC engines	60 s60 s60 s
All other modifications	120 s120 s120 s

expand_moreSpeed for disturbance variable


All Audi gasoline V6 2.6 L ABC engines	580–920 rpm580–920 rpm580–920 rpm

expand_moreAll Audi gasoline straight-4 1.8 L ADR engines


ADR engine	720–1000 rpm720–1000 rpm720–1000 rpm

expand_moreAPT engine


With automatic gearbox	670–970 rpm670–970 rpm670–970 rpm
With manual transmission	710–1010 rpm710–1010 rpm710–1010 rpm

expand_moreARG engine


With automatic gearbox	670–970 rpm670–970 rpm670–970 rpm
With manual transmission	710–1010 rpm710–1010 rpm710–1010 rpm

expand_moreAll Audi gasoline straight-4 1.8 L AEB engines


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

expand_moreAll Audi gasoline V6 2.4 L AGA engines


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


All Audi gasoline straight-4 1.8 L AJL engines	720–1000 rpm720–1000 rpm720–1000 rpm

expand_moreAll other modifications


ACK engine	540–860 rpm540–860 rpm540–860 rpm
ALG engine	520–840 rpm520–840 rpm520–840 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_moreAll Audi gasoline straight-4 1.8 L AEB engines


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

expand_moreAll Audi gasoline V6 2.4 L AGA engines


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


All other modifications	630–770 rpm630–770 rpm630–770 rpm


Voltage swing at test speed	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 1998 Audi A4 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 A4 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 1998 Audi A4 Quattro you're not only saving money, but also also improving your technical skills and learning something new.

1998 Audi A4 Quattro B5 Emission

Table of Contents

Conquer your fears and never give up!

Audi A4 Quattro B5 model years

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