The diagnostic socket is located on the driver's side in the footwell below the dashboard.
Exhaust gas recirculation (EGR)
No
expand_moreIdling speed with manual gearbox
All other modifications
530–630 rpm530–630 rpm530–630 rpm
expand_moreMinimum engine oil temperature at VET
All other modifications
176°F176°F80°C
expand_morePetrol exhaust gas values
expand_moreCO content at idling speed
All other modifications
0–0.2 %0–0.2 %0–0.2 %
expand_moreCO content at increased idling speed
All other modifications
0.2 %0.2 %0.2 %
Current at test speed
−0.000115–+0.000077 A−0.000115–+0.000077 A−0.000115–+0.000077 A
expand_moreDelta lambda
expand_moreDME MS 5.1
Vehicles without OBD
0.02 λ0.02 λ0.02 λ
expand_moreIncreased idling speed
All other modifications
2500–3000 rpm2500–3000 rpm2500–3000 rpm
expand_moreLambda sensor design
All other modifications
wideband 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
Petrol conditioning speed
3000 rpm3000 rpm3000 rpm
Petrol conditioning time
180 s180 s180 s
expand_moreSpeed for disturbance variable
expand_moreDME MS 5.1
Vehicles without OBD
230–930 rpm230–930 rpm230–930 rpm
To reduce environment impact and pass government inspections keep emission parameters at the level prescribed by BMW.
Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 1999 BMW X5 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 BMW 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 BMW X5 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 BMW X5 you're not only saving money, but also also improving your technical skills and learning something new.