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Definition Of Code P0138
What Any Code P0138 Means
P0138 is a generic OBD-II code indicating that the Bank 1 sensor O2 sensor has current multiple outputs below 1.2V for significantly more than 10 seconds, indicating a lack of oxygen in the engine power flow.
What causes code P0138?
The automatic control module (ECM) sees the approximate O2 sensor voltage for lender 1, sensor 2 above 1.2V when the ECM commands the fuel type to target lean based on the respective engine bank.
The ECM detects a high voltage problem and the indicator turns on engine checks.
Other Use Oxygen Sensors The ECM attempts to control fuel injection using their readings.
What are the symptoms of code P0138 almost always?
After checking the sensor and correcting the problem, the engine may run lean and misfires may be delayed. Confirm will light up
Probably the indicator is right Check engine.
You may experience engine performance problems depending on engine failure or rich mixture.
How exactly does a mechanic diagnose a P0138 code?
Scans document codes and freeze frame resources, then cleans up error checking codes.
Tracks data from the O2 sensor to get an idea of the fast change in voltage between low and high compared to other sensors, to help you.
Checks the wires and harnesses of the O2 sensor for corrosion in the connectors. what
Checks that the O2 sensor is not damaged or contaminated with fruit juice.
Checks exhaust gases before they leave the sensor.
Perform manufacturer specific screening tests for further diagnosis.
Common Problems When Diagnosing A Sensor With Code P0138
Bank 1 O2 Operator 1 can be used to diagnose an O2 sensor for Bank 2 1 by comparing the two sensors. The performance must be almost unbelievable, except that the 2 sensorsShould have more low O2 readings because the switch readings must burn excess electricity and oxygen.
Make sure the O2 sensor is not contaminated with coolant or that there are no engine leaks.
Check the catalytic converter for blockage or damage, if this could cause erroneous sensor readings.
How legit is code P0138?
O2 sensor output current can be related to an exhaust duct break, which can cause superior O2 sensors to provide output voltage.
The ECM may not properly control the engine’s air-fuel ratio, resulting in switch fouling and excessive fouling in your current engine with fouled spark plugs.
What repairs can fix the P0138 code?
A high O2 sensor indicates a lack of oxygen in the exhaust or other related problems such as a leaking fuel injector or a bad switch inside.