Kadjar Engine Issues Exhaust Temperature Sensor

I had similar symptoms in my Kadjar. Did you check for temperature fluctuation, especially after cold starts? If the readings from the exhaust temperature sensor are erratic, that's a strong indicator. What's the freeze frame data from the OBD-II scanner?

I did notice some unusual temperature readings. The exhaust temperature seems to fluctuate quite a bit. The OBD-II scanner is showing code P0420, catalyst system efficiency below threshold. Are you suggesting the exhaust temperature sensor might be triggering that code indirectly?

Precisely. The P0420 can be a consequence of incorrect exhaust temperature readings affecting engine management. While it could be the catalytic converter itself, a faulty sensor upstream can definitely cause skewed data. I would suggest having the exhaust system pressure tested and the sensor thoroughly checked by a workshop.

Thanks for the advice! I took it to a trusted workshop, and they confirmed it was indeed the exhaust temperature sensor. They found a small leak in the exhaust manifold that was causing incorrect readings. Sensor replacement and fixing the leak cost me 265€. The car runs smoothly now!