1998 Audi A4 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

expand_more1.6 with gasoline straight-4 1.6 L 99 HP, 140 N⋅m engine (1994.11–2000.10)


ADP engine	820–900 rpm820–900 rpm820–900 rpm
AHL engine	760–960 rpm760–960 rpm760–960 rpm
ANA engine	760–960 rpm760–960 rpm760–960 rpm
ARM engine	760–960 rpm760–960 rpm760–960 rpm

expand_more1.8 T with gasoline straight-4 1.8 L 148 HP, 210 N⋅m engine (1995.1–2000.11)


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


1.8 with gasoline straight-4 1.8 L 114 HP engine (1995.4–2000.11)	780–900 rpm780–900 rpm780–900 rpm

expand_more1.8 with gasoline straight-4 1.8 L 123 HP, 173 N⋅m engine (1995.1–2000.11)


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
AVV engine	810–910 rpm810–910 rpm810–910 rpm

expand_more1.9 TDI with diesel straight-4 1.9 L 109 HP at 4150 RPM, 235 N⋅m at 1900 RPM engine (1995.10–2000.11)


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


1.9 TDI with diesel straight-4 1.9 L 89 HP at 4150 RPM, 235 N⋅m at 1900 RPM engine (1995.1–2000.11)	780–900 rpm780–900 rpm780–900 rpm
1.9 TDI with diesel straight-4 1.9 L 89 HP engine (1995.1–2000.11)	780–900 rpm780–900 rpm780–900 rpm
1.9 TDI with diesel straight-4 1.9 L 89 HP engine (1995.1–2000.11)	780–900 rpm780–900 rpm780–900 rpm

expand_more2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)


AJG engine	670–850 rpm670–850 rpm670–850 rpm
AMM engine	670–770 rpm670–770 rpm670–770 rpm

expand_more2.4 with gasoline V6 2.4 L 162 HP, 230 N⋅m engine (1997.3–2000.11)


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


2.5 TDI with diesel V6 2.5 L 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM engine (1997.9–2000.11)	680–860 rpm680–860 rpm680–860 rpm
2.5 TDI with diesel V6 2.5 L 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM engine (1997.9–2000.11)	680–860 rpm680–860 rpm680–860 rpm
2.6 with gasoline V6 2.6 L 148 HP, 225 N⋅m engine (1995.1–2000.11)	680–820 rpm680–820 rpm680–820 rpm

expand_moreAll other modifications


ACK engine	640–760 rpm640–760 rpm640–760 rpm
ALG engine	740–860 rpm740–860 rpm740–860 rpm
AMX engine	720–820 rpm720–820 rpm720–820 rpm
APR engine	650–750 rpm650–750 rpm650–750 rpm
AQD engine	720–820 rpm720–820 rpm720–820 rpm

expand_moreIdling speed with manual gearbox

expand_more1.6 with gasoline straight-4 1.6 L 99 HP, 140 N⋅m engine (1994.11–2000.10)


ADP engine	820–900 rpm820–900 rpm820–900 rpm
AHL engine	760–960 rpm760–960 rpm760–960 rpm
ANA engine	760–960 rpm760–960 rpm760–960 rpm
ARM engine	760–960 rpm760–960 rpm760–960 rpm

expand_more1.8 T with gasoline straight-4 1.8 L 148 HP, 210 N⋅m engine (1995.1–2000.11)


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


1.8 T with gasoline straight-4 1.8 L 177 HP engine (1997.12–2000.11)	820–900 rpm820–900 rpm820–900 rpm
1.8 with gasoline straight-4 1.8 L 114 HP engine (1995.4–2000.11)	780–900 rpm780–900 rpm780–900 rpm

expand_more1.8 with gasoline straight-4 1.8 L 123 HP, 173 N⋅m engine (1995.1–2000.11)


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
AVV engine	810–910 rpm810–910 rpm810–910 rpm

expand_more1.9 TDI with diesel straight-4 1.9 L 109 HP at 4150 RPM, 235 N⋅m at 1900 RPM engine (1995.10–2000.11)


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


1.9 TDI with diesel straight-4 1.9 L 74 HP engine (1995.12–2000.11)	780–900 rpm780–900 rpm780–900 rpm
1.9 TDI with diesel straight-4 1.9 L 89 HP at 4150 RPM, 235 N⋅m at 1900 RPM engine (1995.1–2000.11)	780–900 rpm780–900 rpm780–900 rpm
1.9 TDI with diesel straight-4 1.9 L 89 HP engine (1995.1–2000.11)	780–900 rpm780–900 rpm780–900 rpm
1.9 TDI with diesel straight-4 1.9 L 89 HP engine (1995.1–2000.11)	780–900 rpm780–900 rpm780–900 rpm

expand_more2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)


AJG engine	670–850 rpm670–850 rpm670–850 rpm
AMM engine	670–770 rpm670–770 rpm670–770 rpm

expand_more2.4 with gasoline V6 2.4 L 162 HP, 230 N⋅m engine (1997.3–2000.11)


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


2.5 TDI with diesel V6 2.5 L 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM engine (1997.9–2000.11)	680–860 rpm680–860 rpm680–860 rpm
2.5 TDI with diesel V6 2.5 L 148 HP at 4000 RPM, 310 N⋅m at 1500 RPM engine (1997.9–2000.11)	680–860 rpm680–860 rpm680–860 rpm
2.6 with gasoline V6 2.6 L 148 HP, 225 N⋅m engine (1995.1–2000.11)	680–820 rpm680–820 rpm680–820 rpm

expand_moreAll other modifications


ACK engine	640–760 rpm640–760 rpm640–760 rpm
ALG engine	740–860 rpm740–860 rpm740–860 rpm
AMX engine	720–820 rpm720–820 rpm720–820 rpm
APR engine	650–750 rpm650–750 rpm650–750 rpm
AQD engine	720–820 rpm720–820 rpm720–820 rpm


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

expand_morePetrol exhaust gas values

expand_moreCO content at idling speed


1.8 with gasoline straight-4 1.8 L 114 HP engine (1995.4–2000.11)	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


1.8 with gasoline straight-4 1.8 L 114 HP engine (1995.4–2000.11)	0.3 %0.3 %0.3 %
2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)	0.3 %0.3 %0.3 %
2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)	0.3 %0.3 %0.3 %
2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)	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_moreIgnition time

expand_moreADP engine


Setting	°00'±3°00' - before TDC + after TDC
Test value	°00'±12°00' - before TDC + after TDC
Carry out basic adjustments using suitable diagnostic unit.

expand_moreIncreased idling speed

expand_more1.8 T with gasoline straight-4 1.8 L 148 HP, 210 N⋅m engine (1995.1–2000.11)


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

expand_more2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)


AJG engine	2500–2800 rpm2500–2800 rpm2500–2800 rpm
AMM engine	2500–3200 rpm2500–3200 rpm2500–3200 rpm

expand_more2.4 with gasoline V6 2.4 L 162 HP, 230 N⋅m engine (1997.3–2000.11)


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

expand_more2.8 with gasoline V6 2.8 L 190 HP at 3200 RPM, 280 N⋅m at 3200 RPM engine (1996.10–2000.11)


AMX 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_more1.8 T with gasoline straight-4 1.8 L 148 HP, 210 N⋅m engine (1995.1–2000.11)


AWT engine	wideband sensor

expand_more2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)


AMM engine	Jump type lambda sensor

expand_more2.8 with gasoline V6 2.8 L 190 HP at 3200 RPM, 280 N⋅m at 3200 RPM engine (1996.10–2000.11)


AMX engine	Jump type lambda sensor


All other modifications	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


1.6 with gasoline straight-4 1.6 L 99 HP at 5300 RPM, 140 N⋅m at 3800 RPM engine (1994.11–2000.10)	2500 rpm2500 rpm2500 rpm
1.6 with gasoline straight-4 1.6 L 99 HP at 5300 RPM, 140 N⋅m at 3800 RPM engine (1994.11–2000.10)	2500 rpm2500 rpm2500 rpm
1.6 with gasoline straight-4 1.6 L 99 HP at 5300 RPM, 145 N⋅m at 3800 RPM engine (1994.11–2000.10)	2500 rpm2500 rpm2500 rpm
1.6 with gasoline straight-4 1.6 L 99 HP, 140 N⋅m engine (1994.11–2000.10)	2500 rpm2500 rpm2500 rpm

expand_more1.8 T with gasoline straight-4 1.8 L 148 HP, 210 N⋅m engine (1995.1–2000.11)


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

expand_more2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)


AJG engine	2500–2800 rpm2500–2800 rpm2500–2800 rpm
AMM engine	2500–3200 rpm2500–3200 rpm2500–3200 rpm

expand_more2.4 with gasoline V6 2.4 L 162 HP, 230 N⋅m engine (1997.3–2000.11)


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

expand_more2.8 with gasoline V6 2.8 L 190 HP at 3200 RPM, 280 N⋅m at 3200 RPM engine (1996.10–2000.11)


AMX 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


2.6 with gasoline V6 2.6 L 148 HP, 225 N⋅m engine (1995.1–2000.11)	60 s60 s60 s
All other modifications	120 s120 s120 s

expand_moreSpeed for disturbance variable

expand_more1.6 with gasoline straight-4 1.6 L 99 HP, 140 N⋅m engine (1994.11–2000.10)


ADP engine	720–1000 rpm720–1000 rpm720–1000 rpm
Otherwise	660–1060 rpm660–1060 rpm660–1060 rpm

expand_more1.8 T with gasoline straight-4 1.8 L 148 HP, 210 N⋅m engine (1995.1–2000.11)


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


1.8 T with gasoline straight-4 1.8 L 177 HP engine (1997.12–2000.11)	720–1000 rpm720–1000 rpm720–1000 rpm

expand_more1.8 with gasoline straight-4 1.8 L 123 HP, 173 N⋅m engine (1995.1–2000.11)


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


AVV engine	710–1010 rpm710–1010 rpm710–1010 rpm

expand_more2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)


AJG engine	570–950 rpm570–950 rpm570–950 rpm

expand_more2.4 with gasoline V6 2.4 L 162 HP, 230 N⋅m engine (1997.3–2000.11)


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


2.6 with gasoline V6 2.6 L 148 HP, 225 N⋅m engine (1995.1–2000.11)	580–920 rpm580–920 rpm580–920 rpm

expand_moreAll other modifications


ACK engine	540–860 rpm540–860 rpm540–860 rpm
ALG engine	640–960 rpm640–960 rpm640–960 rpm
APR engine	550–850 rpm550–850 rpm550–850 rpm
AQD engine	620–920 rpm620–920 rpm620–920 rpm

expand_moreTest speed for lambda sensor signal

expand_more1.8 T with gasoline straight-4 1.8 L 148 HP, 210 N⋅m engine (1995.1–2000.11)


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

expand_more2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)


AMM engine	670–770 rpm670–770 rpm670–770 rpm

expand_more2.4 with gasoline V6 2.4 L 162 HP, 230 N⋅m engine (1997.3–2000.11)


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


All other modifications	720–820 rpm720–820 rpm720–820 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 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 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 you're not only saving money, but also also improving your technical skills and learning something new.

1998 Audi A4 B5 Emission

Table of Contents

Conquer your fears and never give up!

Audi A4 B5 model years

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