The diagnostic socket is located on the driver's side in the footwell at the A column.
expand_moreIdling speed with automatic gearbox
All other modifications
600–860 rpm600–860 rpm600–860 rpm
expand_moreIdling speed with manual gearbox
All other modifications
600–860 rpm600–860 rpm600–860 rpm
expand_moreMinimum engine oil temperature at VET
All other modifications
158°F158°F70°C
expand_morePetrol exhaust gas values
CO content at idling speed
0–0.2 %0–0.2 %0–0.2 %
CO content at increased idling speed
0–0.2 %0–0.2 %0–0.2 %
expand_moreCurrent at test speed
All other modifications
−0.000115–+0.000077 A−0.000115–+0.000077 A−0.000115–+0.000077 A
Increased idling speed
2300–2700 rpm2300–2700 rpm2300–2700 rpm
Lambda sensor design
wideband sensor
expand_moreLambda value
All other modifications
0.91–1.05 λ0.91–1.05 λ0.91–1.05 λ
expand_moreTest speed for lambda sensor signal
All other modifications
600–860 rpm600–860 rpm600–860 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 2012 BMW 3 Series Sedan 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 3 Series Sedan 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 2012 BMW 3 Series Sedan you're not only saving money, but also also improving your technical skills and learning something new.
2012 BMW 3 Series Sedan generations
In 2012 BMW offered 2 generations of the 3 Series Sedan. Emission may vary in different generations. Be sure that you are looking at the rigt modification.