How to clean the boost sensor in a 2006 Jeep Liberty CRD?

Answer 1

The boost control sensor provides the turbo boost pressure and intake air temperature to the ECU for control of fuelling. Contamination of this sensor through accumulation of soot that is passed back into the intake via the EGR system can stop it functioning optimally, and lead to symptoms such as lack of responsiveness when accelerating, a rough idle, higher fuel use, and loss of power.

Thankfully its relatively easy to remove and clean.

The boost control and temperature sensor is located on the top of the engine, under a wiring harness, towards the back right hand corner when looking at the engine. It is held in place by one screw that you use an 8mm hex key to undo.

Once the screw is undone, remove the screw and washer from the sensor and store it safely BEFORE you remove the sensor from the engine. This will prevent you dropping the screw and the washer into the engine intake! Replace in the reverse order, sensor first (seat it in the hole) and then put the washer and screw in and tighten.

The sensor can be cleaned with a liberal application of a high quality carby cleaner in a spray can. This will dissolve the soot and return the sensor to proper operating functionality.