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P0138, P0158 HO2S2 EC-165 < COMPONENT DIAGNOSIS > [VQ40DE] C D E F G H I J K L M A EC N P O P0138, P0158 HO2S2 Component Description INFOID:0000000001375895 The heated oxygen sensor 2, after three way catalyst (manifold), On Board Diagnosis Logic INFOID:0000000001375897 The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/ MALFUNCTION A To judge the malfunctions of heated oxygen sensor 2, ECM monitors MALFUNCTION B To judge the malfunctions of heated oxygen sensor 2, ECM monitors SEF327R PBIB1848E PBIB2376E DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0138 Heated oxygen sensor 2 cir- A) An excessively high voltage from the • Harness or connectors (The sensor circuit is open or shorted) • Heated oxygen sensor 2 P0158 B) The minimum voltage from the sensor • Harness or connectors (The sensor circuit is open or shorted) • Heated oxygen sensor 2 |