Kadjar Exhaust Pressure Sensor

Good day. Your description is quite thorough. The symptoms you are observing – reduced power, smoke upon acceleration, and a potent exhaust odor – strongly indicate a potential issue within the exhaust system, possibly related to the diesel particulate filter (DPF). As you mentioned the exhaust back pressure sensor, this sensor is used by the Engine Control Unit (ECU) to monitor DPF performance. A faulty sensor can provide incorrect information, leading to the issues you have described. Have you performed any diagnostic checks beyond visual inspection and noticing the warning light? Specifically, have you checked for any error codes using an OBD-II scanner?

Thanks for the swift response. I haven't had a chance to hook it up to a scanner yet. I was hoping to get a bit of insight before I started blindly poking around with diagnostic tools. If it is indeed just a dodgy sensor, is it likely to cause the other issues, or is there a chance the DPF itself is clogged, and the sensor is just reporting the low pressure as a result?

You raise a valid point concerning the potential for a clogged DPF. However, if the DPF were significantly clogged, the pressure would be higher, not lower. It's like trying to force water through a blocked pipe – the pressure builds up behind the blockage. Given that your sensor is reporting low pressure, it is more probable that the sensor is malfunctioning or there is a breach or leak in the exhaust system before the DPF. While a scanner will provide more information, considering the symptoms and your knowledge, it would be advisable to have a qualified mechanic inspect the sensor, its wiring, and the exhaust system itself. A professional evaluation will determine if replacement is necessary. I would suggest booking a workshop appointment at your earliest convenience.

Appreciate the advice, very helpful. Took it to the workshop, and you were spot on. It was indeed the exhaust back pressure sensor. Replaced it and all the symptoms have vanished. Total cost, including the sensor and labor, came to 245€. Thanks again for pointing me in the right direction.