What causes high voltage on O2 sensor?
The high voltage condition from the O2 sensor is indicating a lack of oxygen in the exhaust or other related problems, such as a leaking fuel injector or a broken up catalyst inside.
What voltage should a O2 sensor read?
approximately 0.45 volts
When the air/fuel ratio is perfect and the fuel mixture is 14.7:1 (stoichiometric), the sensor will generate approximately 0.45 volts. This is difficult for the engine controller to achieve. On a normal operating O2 sensor you should see the voltage bounce around quite a bit from rich to lean.
What are the possible causes of p0138 Toyota?
P0138 TOYOTA Possible Causes Faulty Rear Heated Oxygen Sensor Bank 1 Rear Heated Oxygen Sensor Bank 1 harness is open or shorted Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection Intake air leaks Exhaust gas leaks Inappropriate fuel pressure Faulty fuel injectors What does this mean? How do I fix code P0138 TOYOTA
What does Bank One of the p0138 code mean?
The bank one portion of the code indicates that the issue is on the side of the engine that houses the number one cylinder (only applies to engines with a ‘V’ or boxer configuration). Since the code is for sensor 2, we know that we’re dealing with the downstream oxygen sensor.
What is the oxygen sensor code on a Toyota Corolla?
Toyota Corolla P0138: Oxygen Sensor High Voltage (Bank 1 -Sensor 2) February 7, 2019 by Jason. P0138 is a common OBDII code that occurs in many vehicles, including the Toyota Corolla. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more.
When is the p0138 code detected in the ECM?
Most auto repair shops charge between $75 and $150 per hour. When is the code detected? The P0138 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively high for an extended period of time.