DS4 Oil Temperature Sensor Issue

I had a similar issue on my DS4, although I didn't check the error memory myself. Those symptoms definitely sound like a faulty oil temperature sensor. The oil pressure light coming on and off intermittently is a classic sign. Have you checked the resistance of the sensor itself with a multimeter when the engine is hot and cold?

Thanks for the quick response! No, I haven't checked the resistance yet. I was hoping to avoid getting that deep into it, but I guess I have to. Do you remember what kind of resistance values I should be looking for at different temperatures? Also, was your issue consistently present, or did it come and go?

Unfortunately, I don't remember the exact resistance values – you'd need the official Citroen repair manual for that. My issue was intermittent at first, but then became more frequent until the warning lights were on almost constantly. To be honest, I ended up taking it to a workshop. They confirmed it was the oil temperature sensor and replaced it. Cost me about 95€ including labor. Might be worth getting it properly diagnosed before you start replacing things yourself.

Okay, thanks a lot for the info! Knowing that someone else had the same problem and that the workshop confirmed the sensor is a big help. I'll check the resistance as best as I can, but I'll probably end up taking it to the shop for a proper diagnosis and replacement. 95€ sounds reasonable, so at least I know what to expect. Cheers!