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Symptom: P0432-2/1 CATALYTIC CONVERTER EFFICIENCY When Monitored and Set Condition: P0432-2/1 CATALYTIC CONVERTER EFFICIENCY When Monitored: After engine warm up to 147 deg. F, 180 seconds of open throttle operation, at a speed greater than 20 mph, with the engine at 1200-1700 rpm and MAP Set Condition: As catalyst efficiency deteriorates, the switch rate of the downstream O2 sensor approaches that of the upstream O2 sensor. If at any point during the test the POSSIBLE CAUSES EXHAUST LEAK CATALYST EFFICIENCY DTC DOES NOT REOCCUR ENGINE MECHANICAL PROBLEM CATALYTIC CONVERTER 2/1 UPSTREAM O2 SENSOR OLDER THAN DOWNSTREAM O2 SENSOR TEST ACTION APPLICABILITY 1 With the DRBIII t, read DTCs. Is the GOOD TRIP COUNTER displayed and equal to zero? All Yes → No → 2 At this time the Catalyst Efficiency Failure does not exist or is an intermittent t, read the FREEZE FRAME data. With this screen, attempt to duplicate the condition that has set this fault. All Yes → No → Test Complete. 3 Start the engine, Allow the engine to idle. All Yes → Repair or replace leaking exhaust parts as necessary. No → 169 DRIVEABILITY - GAS |