You should start with pressure/vacuum testing the cooling system to find the cause of the coolant loss. Known causes of coolant leaks on the 1.6 ECOboost are: 1. Leaking water pump seal. 2. Cracked degas hose. 3. Cracked coolant reservoir. 4. cracked or warped thermostat housing.
There isn't a service light on the Mk2 Focus, the warning you're getting is something like 'engine service now' iirc, which is actually a fault warning, that is most likely being caused by this DPF issue.
If it is going into limp mode, or a warning light is coming on, there will be DTCs srored somewhere. But most OBD readers are very limited, to basic engine faults. You need a system like Forscan, which is a powerful Ford specific system. Cost £15.00 for the interface. Needs a computer of some sort.Ford focus: 2009 ford focus 1.6 tdci, engine systems fault 2009 ford focus 1.6 tdci, engine systems fault light come on. Still runs OK, but worried about continung to drive it. Reset the seatbelt warning system on Mk7 Fiesta: 1. With the key out, insert it into the ignition and turn it so that the dash lights up (don't start the engine!) 2. Buckle and unbuckle the seatbelt 9 times (yes, it has to be exactly 9 times, don't ask me why!) 3. The seatbelt warning light should flash briefly to indicate a reset. 4. Hi Neil, I am looking at at buying a Ford Focus C-Max, 1.6 TDCI, 2007 plate with 75000 miles on the clock. It is priced very sensibly but the ad says that there is an "engine system fault on the dash" … read more Ford Year: 2015. UK/Ireland Location: Sussex. Posted November 30, 2021. On mk2 sometimes the immobiliser problem is caused by faulty soldering in the instrument cluster or faulty/dirty/corroded canbus wire connectors on the way to ecu. Perhaps with age the mk2 problems will now be appearing on the later cars. Ford Model: S max. Ford Year: 2008. UK/Ireland Location: Northamptonshire. Posted February 24, 2016. Hi I new here. I got my 2008 s max zetec 2.0 tdci a few months ago. The esp and engine malfunction came then turns off when you restart the car. This morning the engine light came on but wont turn off. The DTC says C16787 C14000 C20000 C41668. q4Bdbq.