Instruments and controls 77Antilock brake system(ABS)u illuminates yellow.Illuminates briefly after the ignition isswitched on. The system is ready foroperation when u extinguishes.If control indicators u and Ailluminate with the messages CHECKABS and CHECK ESP in the DriverInformation Centre, there is a fault inthe ABS. The brake system remainsoperational but without ABSregulation.If control indicators u, A, R andC illuminate, the ABS and ESP aredeactivated and the messageBRAKING FAULT is displayed. Seekthe assistance of a workshop.Antilock brake system 3 114.Upshiftk or j illuminates yellow.Illuminates when gearshifting isrecommended to improve fueleconomy.Electronic StabilityProgramv flashes or illuminates yellow.Illuminates for a few seconds whenthe ignition is switched on.Flashing during drivingThe system is actively engaged.Engine output may be reduced andthe vehicle may be brakedautomatically to a small degree3 116.Illuminates during drivingThe system is switched off. Themessage ESP OFF will also appear inthe Driver Information Centre.ESP®Plus 3 116.Engine coolanttemperatureW illuminates red.Illuminates when the engine isrunningStop, switch off engine.CautionCoolant temperature too high.Check coolant level 3 130.If there is sufficient coolant, consult aworkshop.Preheating! illuminates yellow.Preheating is activated. Onlyactivates when outside temperatureis low.Engine oil pressureI illuminates red.Illuminates when the ignition isswitched on and extinguishes shortlyafter the engine starts.