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Re changing the CHT sensor - I have the same problem (temp gauge 'shooting' into the red zone then quickly dropping back) - I changed the sensor but the temp gauge still acts the same. The engine does not seem to overheat and this situation only occurs when the engine is under load when going up hill. This condition does not degrade the engine performance (see handbook) and no error codes are shown on the EMU memory (see handbook for how to check these codes and the web for the interpretation of them) Any ideas anybody please?
Note - If you want to change the sensor - My engine is 1.6 auto 2002 - the CHT sensor is best bought from a Ford dealer as there appear to be a number different ones - cost £23. The sensor lies between the 2nd and 3rd spark plugs and is situated in a well set into the cylinder head. Firstly, the electrical connection is released by gently probing with a thin long screwdriver (checkout a similar connection type in the engine bay first). The sensor can then be unscrewed with a box socket spanner of approx 19mm. However, the upper plastic sensor body is slightly larger than this size so your socket may need to be cut back somewhat. A US blog suggests tieing back the sensor cable clear of the surrounding plug cables (EMF interference?) and I have done this but it did not solve the problem. All idea much appreciated...............
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