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EC-166 < COMPONENT DIAGNOSIS > [HR16DE (WITH EURO-OBD)] P0138 HO2S2 P0138 HO2S2 Description INFOID:0000000001670932 The heated oxygen sensor 2, after three way catalyst (manifold), DTC Logic INFOID:0000000001670933 DTC DETECTION LOGIC The heated oxygen sensor 2 has a much longer switching time between rich and lean than the heated oxygen DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle for 2 minutes. 5. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Go to NO >> INSPECTION END SEF327R PBIB1848E DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0138 Heated oxygen sensor 2 An excessively high voltage from the sensor • Harness or connectors (The sensor circuit is open or shorted) • Heated oxygen sensor 2 |