I couldn't get the PBanders page to load but I found this on Rennlist. It says to blow into the sensor.
Pressure Sensor
Located at a bracket near the battery, the pressure sensor is the single most important sensor in the fuel injection system. Consisting of an iron core surrounded by
a pair of coils, mechanically connected to a thin metal diaphragm, this sensor measures the pressure at the intake air distributor relative to the ambient pressure
(that is, it can correct for changes in altitude).
It can fail in several ways. The coils can develop an electrical fault, or the diaphragm can leak. A defective sensor will often result in a very rich running condition.
However, I have seen one fault resulting in the mixture becoming so lean that the engine wouldn't run. The coils can be tested by measuring the resistance between
terminals #7 & # 15 (should be about 90 ohms) and between #8 & #10 (should be about 350 ohms).
You can try blowing into the sensor to test the diaphragm.
Although they carry different part numbers, the only difference between the 1.7L and 2.0L pressure sensors is calibration. I will describe how you can change this
yourself later on.