1995 Audi A6 Avant Quattro emission

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Condition	Value

expand_moreDiesel exhaust gas values

expand_moreCut-off control speed


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	4500–5500 rpm4500–5500 rpm4500–5500 rpm

expand_moreDiesel conditioning gas injections


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	10
from 60° C engine oil temperature

expand_moreDiesel conditioning speed


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	4500–5500 rpm4500–5500 rpm4500–5500 rpm
from 60° C engine oil temperature

expand_moreMaximum K-value


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	2 1/m2 1/m2 1/m

expand_moreMeasuring mode


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	B

expand_moreMeasuring sensor


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	1

expand_moreMeasuring time


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	0.5 s0.5 s0.5 s

expand_moreStoppage time


2.5 TDI quattro with diesel straight-5 2.5 L 138 HP at 4000 RPM, 290 N⋅m at 1900 RPM engine (1995.7–1997.12)	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


All Audi gasoline straight-5 2.3 L AAR engines	650–790 rpm650–790 rpm650–790 rpm
All Audi gasoline V6 2.6 L ABC engines	680–820 rpm680–820 rpm680–820 rpm
All Audi gasoline V6 2.8 L ACK engines	640–760 rpm640–760 rpm640–760 rpm
All Audi gasoline straight-4 1.8 L ADR engines	820–900 rpm820–900 rpm820–900 rpm
All other modifications	650–750 rpm650–750 rpm650–750 rpm

expand_moreIdling speed with manual gearbox


All Audi gasoline straight-5 2.3 L AAR engines	650–790 rpm650–790 rpm650–790 rpm
No adjustment possible
All Audi gasoline V6 2.6 L ABC engines	680–820 rpm680–820 rpm680–820 rpm
All Audi gasoline straight-4 2.0 L ACE engines	800–1000 rpm800–1000 rpm800–1000 rpm
All Audi gasoline V6 2.8 L ACK engines	640–760 rpm640–760 rpm640–760 rpm
All Audi gasoline straight-4 1.8 L ADR engines	820–900 rpm820–900 rpm820–900 rpm
All Audi diesel straight-5 2.5 L AEL engines	710–820 rpm710–820 rpm710–820 rpm
No adjustment possible
All other modifications	650–750 rpm650–750 rpm650–750 rpm


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

expand_morePetrol exhaust gas values

expand_moreCO content at idling speed

expand_moreAll Audi gasoline straight-5 2.3 L AAR engines


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 %


All other modifications	0–0.5 %0–0.5 %0–0.5 %


CO content at increased idling speed	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-5 2.3 L AAR engines	-15°00'±1°00' - before TDC + after TDC
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 Audi gasoline straight-4 1.8 L ADR engines	70 ppm70 ppm70 ppm
All other modifications	100 ppm100 ppm100 ppm


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

expand_morePetrol conditioning time


All Audi gasoline straight-5 2.3 L AAR engines	120 s120 s120 s
All Audi gasoline V6 2.8 L ACK engines	120 s120 s120 s
All Audi gasoline straight-4 1.8 L ADR engines	120 s120 s120 s
All other modifications	60 s60 s60 s

expand_moreSpeed for disturbance variable


All Audi gasoline straight-5 2.3 L AAR engines	550–890 rpm550–890 rpm550–890 rpm
All Audi gasoline V6 2.6 L ABC engines	580–920 rpm580–920 rpm580–920 rpm
All Audi gasoline straight-4 2.0 L ACE engines	700–1100 rpm700–1100 rpm700–1100 rpm
All Audi gasoline V6 2.8 L ACK engines	540–860 rpm540–860 rpm540–860 rpm
All Audi gasoline straight-4 1.8 L ADR engines	720–1000 rpm720–1000 rpm720–1000 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 1995 Audi A6 Avant 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 A6 Avant 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 1995 Audi A6 Avant Quattro you're not only saving money, but also also improving your technical skills and learning something new.

1995 Audi A6 Avant Quattro C4 Emission

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Conquer your fears and never give up!

Audi A6 Avant Quattro C4 model years

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