8/27/2023 0 Comments O2 sensor 2011 equinox locationsThe ECM can lose control or get the wrong input from sensors like the mass airflow sensor or the O2 sensor if they are within specification but incorrect. Along with the O2 sensors, failure of any of these components will cause the ECM to miscalculate the air/fuel ratio going into the engine. This code can be due to problems with the mass airflow sensor, which is needed to calculate the proper amount of air entering the engine. The no response of the O2 sensor can be caused by a mass airflow sensor being contaminated and not calculating the amount of air entering the engine on the intake side. Check the mass airflow sensor for proper operation and contamination before replacing the O2 sensor.Monitors the mass airflow sensor data for responses to throttle changes, per specificationsįollows the manufacturer's specific pinpoint tests for further diagnosis of the code (tests differ between manufacturers)Ĭommon mistakes when diagnosing the P0140 code? Monitors the O2 sensor data to see if the voltage is is moving above or below 410-490 mV Scans codes and documents freeze frame data How does a mechanic diagnose the P0140 code? The ECM loses the ability to keep the fuel system air-to-fuel ratio correct (could cause erratic driving symptoms) Hesitation (upon acceleration after a deceleration phase) The Check Engine Light will come on, indicating a problem The ECM could be malfunctioning in the O2 circuit The O2 sensor and mass airflow sensor comparison is misinterpreted by the ECM The O2 sensor for Bank 1, Sensor 2 does not respond (does not have a voltage change between 410-490 mV) to the fuel cutoff or fuel enrichment signals from the ECM for more than 74 seconds The ECM determines that the O2 sensor has no activity P0140 is the OBD-II generic code which indicates that the O2 sensor for Bank 1, Sensor 2 failed respond to the fuel cutoff or fuel enrichment signals by the Engine Control Module (ECM). Otherwise, the boot might melt and it might prevent the sensor from operating correctly.O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2) What the P0140 code means Do not drop a sensor or handle it roughly.Į) Make sure that the silicone boot on the sensor is installed in the correct position. Damaging or removing the pigtail or electrical connector will render the sensor useless.ī) Keep grease, dirt and other contaminants away from the electrical connector and the louvered end of the sensor.Ĭ) Do not use cleaning solvents of any kind on an oxygen sensor.ĭ) Oxygen sensors are extremely delicate. Be careful not to burn yourself during the following procedure.īe particularly careful when servicing an oxygen sensor and follow these guidelines:Ī) Oxygen sensors have a permanently attached pigtail and an electrical connector that cannot be removed. Rather than risk damage to the sensor or its mounting threads, start and run the engine for a minute or two, then shut it off. Note: Because it is installed in the exhaust manifold or pipe, both of which contract when cool, an oxygen sensor might be very difficult to loosen when the engine is cold. There is no set time when O2 sensor should be replaced, but 100,000 miles or 5 years is a good guideline, or when the check engine light indicates a fault. The oxygen (O2) sensor informs the engine computer how much free oxygen is in the exhaust, allowing it to judge exactly how much fuel to provide for best power, economy, and emissions. This page is taken from our digital online manual 38040 for the 2005-17 Chevrolet Equinox, 2010-17 GMC Terrain, and 2006-09 Pontiac Torrent, 2WD or 4WD with 4 cylinder or V6 engines. All Haynes Digital Online Manuals feature everything you love about our books in an instantly accessible digital online form, that you can use via any device with an internet connection.
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