DTC P0432: 2/1 Catalytic Converter Efficiency: Description

NOTE: 2/1 Heated Oxygen Sensor (HO2S) may also be referred to as an upstream oxygen sensor. 2/1 HO2S is located in outlet flange of left exhaust manifold. 2/1 catalytic converter is located in left exhaust pipe.

Catalytic converter efficiency is monitored after engine warms up to 147°F (63.8°C), throttle has been open for 180 seconds when vehicle speed is more than 20 MPH, with engine speed at 1200-1700 RPM and MAP vacuum 15-21 in. Hg. DTC will set in Powertrain Control Module (PCM) memory when PCM senses catalyst efficiency deteriorated to a predetermined value. Possible causes are: defective 2/1 catalytic converter, exhaust leak, engine mechanical problem or lazy upstream Heated Oxygen Sensor (HO2S).