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DTC P0133, P0153 HO2S1 EC-1391 [VG33ER] C D E F G H I J K L M A EC 3. CHECK FOR EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold). OK or NG OK >> GO TO 4. NG >> Repair or replace. 4. CHECK FOR INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. OK >> GO TO 5. NG >> Repair or replace. SEC502D |