![]() ![]() Turn your car on and take it for a drive to make sure your vehicle is running smoothly and the check engine light is off. Finally, plug the electrical cable back into the outlet next to the exhaust line. ![]() You wont pass emissions inspection either. Without a signal from the upstream oxygen sensor the check engine light will be on constantly and the computer will go into default mode. Fit the threaded end of the sensor into the port on the exhaust line and screw it in clockwise by hand, then tighten it with a wrench fit with an oxygen sensor socket. The upstream oxygen sensor is how the computer maintains the proper air to fuel mixture so the engine will run correctly. Most new sensors come with a small package of this lubricant, so you won’t have to buy it separately. Apply a small amount of anti-seize lubricant to the threaded end of the sensor and wipe the threads with a rag to spread the lubricant evenly. If possible, select a new sensor that is the exact same size, shape, and brand as the new one. Turn the wrench counterclockwise until the old sensor is loose enough so that you can finish unscrewing it by hand. Unscrew the sensor with a 3/8 inch (0.95 cm) ratchet wrench fit with a 7/8 inch (2.2 cm) oxygen sensor socket. If the end of the cable that’s attached to the exhaust line is corroded or too stiff to unscrew easily, spray it with a penetrating oil such as Kroil or Liquid Wrench, then let it sit for a few minutes. In some cases, there can be other symptoms as well. Push down the small plastic tab at the end of the plug and pull the plug out of its outlet to disconnect it. How to Fix a P0138 Code: O2 Sensor Circuit High Voltage Bank 1 Sensor 2 Watch on Chevy Cobalt P0138 Symptoms Typically, the only symptom of P0138 is going to be the service engine soon light. Once you find a sensor, follow the black cable emerging from it until you find the plug connecting it to the car’s electrical system. In more recent cars, look for 2 sensors in each of these locations. You might find another sensor under the car, behind the catalytic converter. Most cars have a sensor located on the exhaust pipe next to the motor inside the engine compartment. To find the oxygen sensor, look for a part that resembles a spark plug with a thick, black cable attached to it. If your car has two or more oxygen sensors, you may also need to jack up your vehicle so you can reach any sensors located under the car. Once you’ve confirmed that you need to change the oxygen sensor, let your engine cool for at least 30 minutes before you try to handle it. You can find OBD error codes online, or see your mechanic for more information. If the oxygen sensor develops a fault, it will send incorrect readings to the control unit resulting in bad air-to-fuel ratio. ![]() To make sure, plug an OBD code scanner into your car’s dashboard, and check the error code that it gives you to see if it shows a problem with your oxygen sensor. The O2 sensor in Cobalt monitors the level of oxygen in the exhaust gasses that exit the engine and reports the data to the control unit which continuously adjusts the air-to-fuel ratio in the engine. If your car’s “check engine” light is on, the problem may be with your oxygen sensor. ![]()
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