REMOVAL CAUTION / NOTICE / HINT CAUTION:
PROCEDURE 1. REMOVE HEATED OXYGEN SENSOR (See page 2. REMOVE TAILPIPE ASSEMBLY (a) Remove the bolt and clamp. (b) Disconnect the exhaust pipe support to remove the tailpipe assembly. (c) Remove the gasket. 3. REMOVE CENTER EXHAUST PIPE ASSEMBLY (a) Remove the 4 bolts. (b) Disconnect the 3 exhaust pipe supports to remove the center exhaust pipe assembly. (c) Remove the 2 gaskets. 4. REMOVE FRONT EXHAUST PIPE ASSEMBLY (a) Remove the 3 nuts and front exhaust pipe assembly. (b) Remove the gasket. 5. REMOVE AIR FUEL RATIO SENSOR (for Bank 2 Sensor 1)
6. REMOVE FRONT NO. 2 EXHAUST PIPE ASSEMBLY (a) Remove the 3 nuts. (b) Disconnect the exhaust pipe support to remove the front No. 2 exhaust pipe assembly. (c) Remove the gasket. 7. REMOVE AIR FUEL RATIO SENSOR (for Bank 1 Sensor 1) |
Toyota Tundra Service Manual > Sfi System: Catalyst System Efficiency Below Threshold (Bank 1) (P0420,P0430)
MONITOR DESCRIPTION The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the Air-Fuel Ratio (A/F) sensor, sends pre-catalyst information to the ECM. The second sensor, the Heated Oxygen (HO2) sensor, sends post-catal ...