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B: Heated oxygen sensor 1 (front) voltage switching fre- NOTE: Diagnostic Procedure NHEC0217 1 CHECK EXHAUST SYSTEM Visually check exhaust tubes and muffler for dent. OK or NG OK © GO TO 2. NG © Repair or replace. 2 CHECK EXHAUST AIR LEAK 1. Start engine and run it at idle. SEF099P OK or NG OK © GO TO 3. NG © Repair or replace. 3 CHECK INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. OK or NG OK © GO TO 4. NG © Repair or replace. GI MA EM LC FE AT AX SU BR ST RS BT HA SC EL IDX DTC P0420 (BANK 1), P0430 (BANK 2) THREE WAY CATALYST FUNCTION Overall Function Check (Cont’d) EC-359 |