1999 Audi A8 emission

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Condition	Value

expand_moreDiesel exhaust gas values


Cut-off control speed	4500–5500 rpm4500–5500 rpm4500–5500 rpm
Diesel conditioning gas injections	10
from 60° C engine oil temperature
Diesel conditioning speed	4500–5500 rpm4500–5500 rpm4500–5500 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 panel under the ashtray.

expand_moreIdling speed with automatic gearbox


All Audi diesel V6 2.5 L AFB engines	680–860 rpm680–860 rpm680–860 rpm
All Audi gasoline V8 3.7 L AKC engines	670–730 rpm670–730 rpm670–730 rpm
All Audi diesel V6 2.5 L AKN engines	680–860 rpm680–860 rpm680–860 rpm
All Audi gasoline V8 3.7 L AQG engines	670–730 rpm670–730 rpm670–730 rpm
All other modifications	740–860 rpm740–860 rpm740–860 rpm

expand_moreIdling speed with manual gearbox


All Audi diesel V6 2.5 L AFB engines	680–860 rpm680–860 rpm680–860 rpm
All Audi gasoline V8 3.7 L AKC engines	670–730 rpm670–730 rpm670–730 rpm
All Audi diesel V6 2.5 L AKN engines	680–860 rpm680–860 rpm680–860 rpm
All Audi gasoline V8 3.7 L AQG engines	670–730 rpm670–730 rpm670–730 rpm
All other modifications	640–760 rpm640–760 rpm640–760 rpm


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

expand_morePetrol exhaust gas values


CO content at idling speed	0.5 %0.5 %0.5 %
CO content at increased idling speed	0.3 %0.3 %0.3 %
Increased idling speed	2500–2800 rpm2500–2800 rpm2500–2800 rpm
Lambda value	0.97–1.03 λ0.97–1.03 λ0.97–1.03 λ

expand_moreMaximum HC content at idling


All Audi gasoline V8 3.7 L AKC engines	70 ppm70 ppm70 ppm
All Audi gasoline V8 3.7 L AQG engines	70 ppm70 ppm70 ppm
All other modifications	100 ppm100 ppm100 ppm

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 A8 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 A8 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 A8 you're not only saving money, but also also improving your technical skills and learning something new.

1999 Audi A8 generations

In 1999 Audi offered 2 generations of the A8. Emission may vary in different generations. Be sure that you are looking at the rigt modification.

D2 first facelift

Type 4D2, Type 4D8

1999 Audi A8 D2 Emission

Table of Contents

Conquer your fears and never give up!

1999 Audi A8 generations

D2 first facelift

Audi A8 D2 model years

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