Hi there,

I'm having trouble with my 2018 GCM with the 1.0l engine (125hp). The engine warning light is active and OBD readings show P2237 which relates to the O2 sensor bank 1 / sensor 1.

I wanted to check the wiring and measure the resistance of the heater and I have found some images on the internet that show the sensor's location on the 1.0l engine:

(Source: PressReader)

However, it seems that in 2018 the C-Max got the engines from the Focus MK4 (engine code B7DA), it looks totally different and I'm not able to locate the position of the O2 sensors. Does anyone have a clue or an image like above for me?

(Image from the internet, not my C-Max, but looks the same)

 

Thanks in advance and greetings from Germany!

 

Yes, your GCM has the revised 1.0 engine with a cam chain instead of a wet timing belt.

The turbo is on the back of this engine.  So the 02 sensors are not visible in engine bay pictures.