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DTC P0138, P0158 HO2S2 EC-841 < SERVICE INFORMATION > [VK45DE] C D E F G H I J K L M A EC N P O To judge the malfunctions of heated oxygen sensor 2, ECM monitors DTC Confirmation Procedure INFOID:0000000001326683 Perform PROCEDURE FOR MALFUNCTION A first. PROCEDURE FOR MALFUNCTION A With CONSULT-III 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. 6. If 1st trip DTC is detected, go to PROCEDURE FOR MALFUNCTION B With CONSULT-III TESTING CONDITION: ° C (32 to 86 ° F). 1. Turn ignition switch ON and select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III. 2. Start engine and warm it up to the normal operating temperature. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 5. Let engine idle for 1 minute. 6. Make sure that “COOLAN TEMP/S” indicates more than 70 ° C (158 ° F). If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches to 70 ° C (158 ° F). 7. Open engine hood. 8. Select “HO2S2 (B1) P1146” (for DTC P0138) or “HO2S2 (B2) P1166” (for DTC P0158) of “HO2S2” in 9. Start engine and follow the instruction of CONSULT-III. PBIB2376E DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0138 Heated oxygen sensor 2 A) An excessively high voltage from the sen- • Harness or connectors (The sensor circuit is open or shorted) • Heated oxygen sensor 2 P0158 B) The minimum voltage from the sensor is • Harness or connectors (The sensor circuit is open or shorted) • Heated oxygen sensor 2 |