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Discussion Starter · #1 ·
Yesterday evening I stopped at my local dealers. Jumped back in my 2016 Mk2 1.5 Ecoboost (150bhp) to go home and my car wouldnt move. The Temp guage went to up to 120, the car started to shake then the EML light came on and it also said to stop safely.

I popped the bonnet and the coolant pipes were no where near that temperature.

The AA came and plugged into the OBD port. They said the temperature was about 80Deg. They read and cleared some codes. It gave these fault codes:

  • P021900 - Maximum Engine Speed - Limit Exceeded
  • P1023 - Unknown Fault - Malfunction
  • P128500 - Cylinder Head Temperature Monitoring - Temperature Too High
  • P129900 - Cylinder Head Temperature Monitoring - Overheat Protection Active

We started the car again and let it idle for 5-10 minutes. As soon as the fan kicked in the temp rose and it started running rough again.

I believe I could possibly be looking for a faulty temperature sensor or even a loose connection. Possibly the Cylinder head temperature sensor?

Does anyone know where I will find this on the 1.5 engine?

Is it easy to replace? Are there any specialist tools required?

Could it be done on the street?

As currently it is still parked up outside the dealership and I will have to wait over a week for them to look at it.

Thanks in advance.
 

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Discussion Starter · #2 ·
An update for this thread, it was the Cylinder Head Temperature Sensor that was faulty. A £13 part - not sure of the location still though as Fords replaced it for me.
 

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8 gears or more please
TrevorB BMW320 M Sport 2020 M Sport Pro Pack. Tech Pack (Head Up Display)
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5,457 Posts
Thanks for the update Ben, very helpful when people close a problem down
 
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