BMW E90 Instant Fuel Consumption Display: DIGITAL_KVA Coding

On the E90, seeing instant fuel consumption as a figure in the instrument cluster is enabled by setting DIGITAL_KVA in the KOMBI module to aktiv. After coding, current consumption appears numerically in the lower display. The value reads in litres per 100 km or miles per gallon depending on the car's unit setting. What does the instant consumption readout measure? The display combines the injector flow the engine control unit is calculating with road speed to produce consumption for that instant. Unlike the average figure, it carries no history at all: lift off and the number drops immediately, accelerate and it climbs. That is why the readout is used to see the effect of driving style on fuel use in real time. Module: KOMBI Parameter: DIGITAL_KVA Value: aktiv Function: numeric instant consumption in the instrument cluster Units: l/100 km or MPG, following the car's setting Related parameter: BC_DIGITAL_V (digital speed) Risk: low, though KOMBI coding can reset some counters Which E90 model years does it cover? Community lists mark DIGITAL_KVA for every model year from 2006 through 2011, making it one of the broadest cluster codings available. You should still read your own KOMBI data, because on some software levels the line appears with a different suffix. • Marked across all model years from 2006 to 2011. • Units follow the car's measurement system setting; no separate unit parameter is needed. • It shares the lower display with the digital speed readout, and the two are commonly enabled together. • Model-year coverage comes from community-compiled E90 coding lists; the binding source is your own car's FSW/PSW data. How do you code it? The change is a single line in the KOMBI module. OBDThink is an independent BMW coding and diagnostics app and is not affiliated with BMW AG. Before writing to KOMBI, note your service information and trip computer values; per the source list, some cars have these reset after coding. • Photograph the service data and average consumption values before you code. • Switch the ignition on and leave the engine off; trip computer data reads reliably only in this state. • Connect to the car with OBDThink and download the instrument cluster module's coding data. • Save a backup, then find the DIGITAL_KVA line and set it to aktiv. • Write the change and leave the ignition alone until the write completes. • Take a short drive and confirm the value drops when you lift off the throttle. Watching live injection time and road speed in OBDThink lets you sanity-check on the road whether the readout is producing a plausible figure. How do you revert it? Reverting means setting the DIGITAL_KVA line to nicht_aktiv. The readout disappears from the lower display while the trip computer's average consumption page is untouched. Where a pre-coding backup exists, restoring it is the cleaner route. Module: KOMBI Parameter: DIGITAL_KVA Revert value: nicht_aktiv Option 1: set the value to nicht_aktiv and write Option 2: restore the pre-coding backup Check: no instant consumption figure should appear in the lower display What should you know about reading it? Instant consumption produces no meaningful value while the car is stationary, because speed is zero: in l/100 km the calculation runs to infinity so the display blanks or pegs at its maximum, while in MPG it simply falls to zero. A reading taken at idle or waiting at a light is not a fault symptom. Equally, the very low figures seen coasting downhill are normal. This readout is not a diagnostic tool. If you suspect high consumption, judge a fuel system fault from the fuel trim values and stored faults in the engine control unit, not from the number on this display. What if no figure appears? First move the trip computer to the right page; you may need the stalk button to cycle through them. Second, read the KOMBI data back and confirm the value was really written. Third, if your car has iDrive, some versions show this information on the centre screen rather than the cluster, so it never appears in the lower display at all.