The diagnostic socket is located in the central console next to the ashtray.
Idling speed with manual gearbox
750–850 rpm750–850 rpm750–850 rpm
Minimum engine oil temperature at VET
176°F176°F80°C
expand_morePetrol exhaust gas values
CO content at idling speed
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
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
Maximum HC content at idling
100 ppm100 ppm100 ppm
Petrol conditioning speed
2500–2800 rpm2500–2800 rpm2500–2800 rpm
Petrol conditioning time
120 s120 s120 s
Speed for disturbance variable
650–950 rpm650–950 rpm650–950 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 1997 Audi A4 S4 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 S4 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 1997 Audi A4 S4 you're not only saving money, but also also improving your technical skills and learning something new.