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 1999 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.
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 1999 Audi A4 you're not only saving money, but also also improving your technical skills and learning something new.
1999 Audi A4 generations
In 1999 Audi offered 2 generations of the A4. Emission may vary in different generations. Be sure that you are looking at the rigt modification.