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16.04.2007: Apart
Inside, you will find the solenoid pair with fragile wires leading to the harness connector. The top and bottom receiving outlets are sealed with rubber O-rings.

The boost pressure control valve (BPC), also known as the APC solenoid valve, is used on most Saab engines to control the turbo charging pressure. The valves on Trionic5 models are often prone to failure. In some cases it just needs a good cleaning, but sometimes it becomes permanently stuck in one position, causing the car to either stay on base boost, or go into overboost until it hits the fuel cut. This article provides an insight on what could be casing these permanent faliures.

 

 
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