1.6 tdci Engine malfunction message after oil change

[Barladavid]

Hi 

I have a 2013 Ford Focus 1.6 TDCi titanium and I have the following problem:

I am after oil change. From this oil change, after every first start at the morning (cold engine) approx. 30 seconds later I got yellow "Engine malfunction service now" message and the power is decrease. When I restart the engine, the fault is cease. Has anyone any idea?  Other problem is the ambient temperature sensor malfunction. Displayed temperature is much lower than real temperature. any idea?

[TomsFocus]

The temp sensor fault can happen when unplugging the MAF for oil filter change.  No-one seems to know why.  It should sort itself out eventually.  But if it's been a few days then check the MAF is actually plugged in properly.

You would have to have the fault codes read with a Ford specific reader to determine why the engine service message is coming up.

[Barladavid]

Thank you for your answer. I readed out the ecu; It was supriseingly fault code free 😕 

[unofix]

3 hours ago, Barladavid said:

I readed out the ecu; It was supriseingly fault code free 😕 

Using a generic code reader will not get you all of the Ford specific DTC's. 

You need to use FORScan or a Ford diagnostic code reader.