in your garage to make future searches easy.

Condition Value
expand_moreDiesel exhaust gas values
expand_moreCut-off control speed
All Audi diesel V6 2.5 L AFB engines 45005500 rpm
All Audi diesel V6 2.5 L AKN engines 45005500 rpm
All other modifications 48005200 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 45005500 rpm
from 60° C engine oil temperature
All Audi diesel V6 2.5 L AKN engines 45005500 rpm
from 60° C engine oil temperature
All other modifications 48005200 rpm
from 60° C engine oil temperature
Maximum K-value 2 1/m
Measuring mode B
Measuring sensor 1
Measuring time 0.5 s
Stoppage time 1 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 680820 rpm
expand_moreAll Audi gasoline straight-4 1.8 L ADR engines
ADR engine 820900 rpm
APT engine 770870 rpm
ARG engine 770870 rpm
expand_moreAll Audi gasoline straight-4 1.8 L AEB engines
AEB engine 820900 rpm
ANB engine 800920 rpm
APU engine 800920 rpm
AWT engine 740880 rpm
All Audi diesel V6 2.5 L AFB engines 680860 rpm
expand_moreAll Audi diesel straight-4 1.9 L AFN engines
AFN engine 780900 rpm
AVG engine 760900 rpm
All Audi gasoline straight-4 1.8 L AFY engines 780900 rpm
expand_moreAll Audi gasoline V6 2.4 L AGA engines
AGA engine 670850 rpm
ALF engine 670850 rpm
AML engine 670770 rpm
APS engine 650770 rpm
ARJ engine 650770 rpm
All Audi diesel V6 2.5 L AKN engines 680860 rpm
expand_moreAll other modifications
ACK engine 640760 rpm
ALG engine 620740 rpm
AMX engine 630770 rpm
APR engine 650750 rpm
AQD engine 670770 rpm
expand_moreIdling speed with manual gearbox
All Audi gasoline V6 2.6 L ABC engines 680820 rpm
expand_moreAll Audi gasoline straight-4 1.8 L ADR engines
ADR engine 820900 rpm
APT engine 810910 rpm
ARG engine 810910 rpm
expand_moreAll Audi gasoline straight-4 1.8 L AEB engines
AEB engine 820900 rpm
ANB engine 740860 rpm
APU engine 740860 rpm
AWT engine 740880 rpm
All Audi diesel V6 2.5 L AFB engines 680860 rpm
expand_moreAll Audi diesel straight-4 1.9 L AFN engines
AFN engine 780900 rpm
AVG engine 760900 rpm
All Audi gasoline straight-4 1.8 L AFY engines 780900 rpm
expand_moreAll Audi gasoline V6 2.4 L AGA engines
AGA engine 670850 rpm
ALF engine 670850 rpm
AML engine 670770 rpm
APS engine 650770 rpm
ARJ engine 650770 rpm
All Audi gasoline straight-4 1.8 L AJL engines 820900 rpm
All Audi diesel V6 2.5 L AKN engines 680860 rpm
expand_moreAll other modifications
ACK engine 640760 rpm
ALG engine 620740 rpm
AMX engine 630770 rpm
APR engine 650750 rpm
AQD engine 670770 rpm
Minimum engine oil temperature at VET 176°F
expand_morePetrol exhaust gas values
expand_moreCO content at idling speed
All Audi gasoline straight-4 1.8 L AFY engines 0.5 %
All other modifications 00.5 %
expand_moreCO content at increased idling speed
All Audi gasoline straight-4 1.8 L AFY engines 0.3 %
All other modifications 00.3 %
Delta lambda 0.03 λ
expand_moreIncreased idling speed
expand_moreAll Audi gasoline V6 2.8 L ACK engines
AMX engine 25003200 rpm
Otherwise 25002800 rpm
expand_moreAll Audi gasoline straight-4 1.8 L AEB engines
AWT engine 25003000 rpm
Otherwise 25002800 rpm
expand_moreAll Audi gasoline V6 2.4 L AGA engines
AML engine 25003200 rpm
Otherwise 25002800 rpm
All other modifications 25002800 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 0.971.03 λ
Maximum HC content at idling 100 ppm
expand_morePetrol conditioning speed
expand_moreAll Audi gasoline V6 2.8 L ACK engines
AMX engine 25003200 rpm
Otherwise 25002800 rpm
expand_moreAll Audi gasoline straight-4 1.8 L AEB engines
AWT engine 25003000 rpm
expand_moreAll Audi gasoline V6 2.4 L AGA engines
AML engine 25003200 rpm
Otherwise 25002800 rpm
All other modifications 25002800 rpm
expand_morePetrol conditioning time
All Audi gasoline V6 2.6 L ABC engines 60 s
All other modifications 120 s
expand_moreSpeed for disturbance variable
All Audi gasoline V6 2.6 L ABC engines 580920 rpm
expand_moreAll Audi gasoline straight-4 1.8 L ADR engines
ADR engine 7201000 rpm
expand_moreAPT engine
With automatic gearbox 670970 rpm
With manual transmission 7101010 rpm
expand_moreARG engine
With automatic gearbox 670970 rpm
With manual transmission 7101010 rpm
expand_moreAll Audi gasoline straight-4 1.8 L AEB engines
AEB engine 7201000 rpm
expand_moreANB engine
With automatic gearbox 7001020 rpm
With manual transmission 640960 rpm
expand_moreAPU engine
With automatic gearbox 7001020 rpm
With manual transmission 640960 rpm
expand_moreAll Audi gasoline V6 2.4 L AGA engines
AGA engine 570950 rpm
ALF engine 570950 rpm
APS engine 550870 rpm
ARJ engine 550870 rpm
All Audi gasoline straight-4 1.8 L AJL engines 7201000 rpm
expand_moreAll other modifications
ACK engine 540860 rpm
ALG engine 520840 rpm
APR engine 550850 rpm
AQD engine 570870 rpm
expand_moreTest speed for lambda sensor signal
expand_moreAll Audi gasoline straight-4 1.8 L AEB engines
AWT engine 740880 rpm
expand_moreAll Audi gasoline V6 2.4 L AGA engines
AML engine 670770 rpm
All other modifications 630770 rpm
Voltage swing at test speed 0.3 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.

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.

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