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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. 4 CHECK IGNITION TIMING Check for ignition timing. OK or NG OK © GO TO 5. NG © Check camshaft position sensor (PHASE) (EC-302) and crankshaft position sensor DTC P0420 THREE WAY CATALYST FUNCTION QG18DE Diagnostic Procedure (Cont’d) EC-329 |