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DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1); DTC P0430 MONITOR DESCRIPTION The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor The first sensor, the Air-Fuel Ratio (A/F) sensor, sends pre-catalyst information to the ECM. The second sensor, In order to detect any deterioration in the TWC, the ECM calculates the Oxygen Storage Capacity (OSC) of the The OSC value is an indication of the oxygen storage capacity of the TWC. When the vehicle is being driven The ECM uses the OSC value to determine the state of the TWC. If any deterioration has occurred, it DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART DTC DTC Detection Condition Trouble Area P0420 OSC value smaller than standard Gas leakage from exhaust Air-Fuel Ratio (A/F) sensor Heated Oxygen (HO2) Front No. 2 exhaust pipe Front No. 2 exhaust pipe Fuel pressure switching Fuel pressure regulator Fuel pressure regulator for
2009 Toyota Tundra 2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
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