DTC P0106: BARO Sensor Circuit, Performance Problem: Condition
WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Powertrain Control Module (PCM) detects input voltage from EGR boost sensor is less than .22 volt or more than 4.79 volts with engine running. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible cause is: EGR boost sensor malfunction.