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6E1–118 X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION DIAGNOSTIC TROUBLE CODE (DTC) P0131 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 1) D06RX119 Circuit Description The engine control module (ECM) supplies a bias voltage W digital voltmeter, this may display as low as 350 mV. The oxygen sensor varies the voltage within a range Conditions for Setting the DTC D No related Diagnostic Trouble Codes. D Vehicle is operating in ”Closed Loop”. D Engine coolant temperature is above 60 ° C (140 ° F) D ”Closed Loop” commanded air/fuel ratio is between D Throttle angle is between 3% and 19%. All above conditions met for 0.3 seconds and the following D Bank 1 HO2S 1 signal voltage remains below 22 mV Action Taken When the DTC Sets D The ECM will illuminate the malfunction indicator lamp D The ECM will store conditions which were present D ”Open Loop” fuel control will be in effect. Conditions for Clearing the MIL/DTC D The ECM will turn the MIL OFF on the third consecutive D A history Diagnostic Trouble Code P0131 will clear D Diagnostic Trouble Code P0131 can be cleared by Diagnostic Aids Check for the following conditions: D Heated oxygen sensor wiring – The sensor pigtail may D Poor ECM to engine block grounds. D Fuel pressure – The system will go lean if pressure is |