1994 Audi A6 emission

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Condition	Value

expand_moreDiesel exhaust gas values

expand_moreCut-off control speed


All Audi diesel straight-4 1.9 L 1Z engines	4800–5200 rpm4800–5200 rpm4800–5200 rpm
All Audi diesel straight-4 1.9 L AHU engines	4800–5200 rpm4800–5200 rpm4800–5200 rpm
All other modifications	4500–5500 rpm4500–5500 rpm4500–5500 rpm


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

expand_moreDiesel conditioning speed


Audi diesel straight-5 2.5 L AAT 114 HP	4500–5500 rpm4500–5500 rpm4500–5500 rpm
from 60° C engine oil temperature
Audi diesel straight-5 2.5 L AEL 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM	4500–5500 rpm4500–5500 rpm4500–5500 rpm
from 60° C engine oil temperature
Audi diesel straight-4 1.9 L 1Z 89 HP	4800–5200 rpm4800–5200 rpm4800–5200 rpm
from 60° C engine oil temperature
Audi diesel straight-4 1.9 L AHU 89 HP at 4150 RPM, 235 N⋅m at 1900 RPM	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	In the plenum chamber under the cover of the supplementary relay board.

expand_moreIdling speed with automatic gearbox


Audi gasoline straight-4 2.0 L ABK 114 HP	770–870 rpm770–870 rpm770–870 rpm
Audi diesel straight-5 2.5 L AAT 114 HP	710–820 rpm710–820 rpm710–820 rpm
Audi gasoline straight-5 2.3 L AAR 131 HP, 186 N⋅m	650–790 rpm650–790 rpm650–790 rpm
Audi gasoline V6 2.6 L ACZ 137 HP	680–820 rpm680–820 rpm680–820 rpm
Audi diesel straight-5 2.5 L AEL 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM	710–820 rpm710–820 rpm710–820 rpm
No adjustment possible
Audi gasoline V6 2.6 L ABC 148 HP, 225 N⋅m	680–820 rpm680–820 rpm680–820 rpm
Audi gasoline V6 2.8 L AEJ 172 HP	650–750 rpm650–750 rpm650–750 rpm
Audi gasoline V6 2.8 L AFC 172 HP	650–750 rpm650–750 rpm650–750 rpm
Audi gasoline V6 2.8 L AAH 172 HP, 245 N⋅m	650–750 rpm650–750 rpm650–750 rpm
Audi diesel straight-4 1.9 L 1Z 89 HP	780–900 rpm780–900 rpm780–900 rpm
Audi diesel straight-4 1.9 L AHU 89 HP at 4150 RPM, 235 N⋅m at 1900 RPM	780–900 rpm780–900 rpm780–900 rpm

expand_moreIdling speed with manual gearbox


Audi diesel straight-5 2.5 L AAT 114 HP	710–820 rpm710–820 rpm710–820 rpm
Audi gasoline straight-4 2.0 L ABK 114 HP	770–870 rpm770–870 rpm770–870 rpm
Audi gasoline straight-5 2.3 L AAR 131 HP, 186 N⋅m	650–790 rpm650–790 rpm650–790 rpm
No adjustment possible
Audi gasoline V6 2.6 L ACZ 137 HP	680–820 rpm680–820 rpm680–820 rpm
Audi gasoline straight-4 2.0 L ACE 138 HP	800–1000 rpm800–1000 rpm800–1000 rpm
Audi diesel straight-5 2.5 L AEL 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM	710–820 rpm710–820 rpm710–820 rpm
No adjustment possible
Audi gasoline V6 2.6 L ABC 148 HP, 225 N⋅m	680–820 rpm680–820 rpm680–820 rpm
Audi gasoline V6 2.8 L AEJ 172 HP	650–750 rpm650–750 rpm650–750 rpm
Audi gasoline V6 2.8 L AFC 172 HP	650–750 rpm650–750 rpm650–750 rpm
Audi gasoline V6 2.8 L AAH 172 HP, 245 N⋅m	650–750 rpm650–750 rpm650–750 rpm
Audi diesel straight-4 1.9 L 1Z 89 HP	780–900 rpm780–900 rpm780–900 rpm
Audi diesel straight-4 1.9 L AHU 89 HP at 4150 RPM, 235 N⋅m at 1900 RPM	780–900 rpm780–900 rpm780–900 rpm
Audi gasoline straight-4 2.0 L AAE 99 HP	750–1000 rpm750–1000 rpm750–1000 rpm
No adjustment possible


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

expand_morePetrol exhaust gas values

expand_moreCO content at idling speed

expand_moreAudi gasoline straight-5 2.3 L AAR 131 HP, 186 N⋅m


With catalytic converter	0–0.5 %0–0.5 %0–0.5 %
Without catalytic converter	0.5–1.5 %0.5–1.5 %0.5–1.5 %


Audi gasoline V6 2.6 L ACZ 137 HP	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 2.6 L ACZ 137 HP	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


All Audi gasoline straight-4 2.0 L AAE engines	-6°00'±1°00' - before TDC + after TDC
No adjustment possible
All Audi gasoline straight-5 2.3 L AAR engines	-15°00'±1°00' - before TDC + after TDC
All Audi gasoline straight-4 2.0 L ABK engines	-6°00'±1°00' - before TDC + after TDC
No adjustment possible
All Audi gasoline straight-4 2.0 L ACE engines	-6°00'±1°00' - before TDC + after TDC


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 other modifications	100 ppm100 ppm100 ppm


Petrol conditioning speed	2500–2800 rpm2500–2800 rpm2500–2800 rpm

expand_morePetrol conditioning time


Audi gasoline straight-4 2.0 L ABK 114 HP	120 s120 s120 s
Audi gasoline straight-5 2.3 L AAR 131 HP, 186 N⋅m	120 s120 s120 s
All other modifications	60 s60 s60 s

expand_moreSpeed for disturbance variable


Audi gasoline straight-4 2.0 L ABK 114 HP	670–970 rpm670–970 rpm670–970 rpm
Audi gasoline straight-5 2.3 L AAR 131 HP, 186 N⋅m	550–890 rpm550–890 rpm550–890 rpm
Audi gasoline straight-4 2.0 L ACE 138 HP	700–1100 rpm700–1100 rpm700–1100 rpm
Audi gasoline V6 2.6 L ABC 148 HP, 225 N⋅m	580–920 rpm580–920 rpm580–920 rpm
Audi gasoline straight-4 2.0 L AAE 99 HP	650–1100 rpm650–1100 rpm650–1100 rpm
All other modifications	550–850 rpm550–850 rpm550–850 rpm

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 1994 Audi A6 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 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 1994 Audi A6 you're not only saving money, but also also improving your technical skills and learning something new.

1994 Audi A6 C4 Emission

Table of Contents

Conquer your fears and never give up!

Audi A6 C4 model years

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