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Home >> Chevrolet >> 2007 >> Impala Police >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P2227 >> Circuit/System Verification
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Circuit/System Verification

Ignition ON, observe the scan tool MAP and BARO sensor parameters. The readings should be within 5 kPa of each other, and also the current BARO for your location. Refer to Altitude Versus Barometric Pressure .