Lexus IS Diesel Rough Idle Water Sensor

My 2007 Lexus IS diesel is acting up. Check engine light, error stored, and rough running, especially at idle. Mileage is 85892 km. Codes point to the water sensor. Could a defective cable or plug connection be the cause? Visually the sensor looks ok, but could a simple disconnection cause all this?

4 comment(s)

Interesting problem. I had something similar with my old Opel Astra, although the root was different. Engine light, rough running… Are you positive the sensor itself is functional, or might it just be reporting incorrect data?

Good point. How did you diagnose your Astra's issue? Did you have to replace the sensor, or was it wiring as well?

In my case, the garage confirmed it was a faulty sensor. I'd suggest taking your Lexus to a workshop. They can use professional tools for detailed testing and pinpoint it.

Thanks for the insight. I took your advice and went to a workshop. Turns out, it was exactly what I suspected. The cable for the component was defective. They fixed it for 95€, and now she's purring like a kitten again. Appreciate the help!

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