P0138 O2 Sensor Circuit High Voltage Bank 1 Senso Diagnostic trouble code (dtc) p0138 stands for “o2 sensor circuit high voltage (bank 1, sensor 2)”. the code is logged once the pcm detects that the voltage signal from the rear o2 sensor is too high for a given time. although the p0138 code often appears due to a worn out oxygen sensor, it’s not the only condition that can trigger this. Understanding the p0138 code. if you have a dtc of p0138, it’s indicating a problem with high voltage in an oxygen sensor monitors the oxygen levels in the exhaust gases for bank 1, sensor 2. that sensor’s location can vary from vehicle to vehicle. sensor 2 means it’s the downstream sensor – the one after the catalytic converter.
How To Fix Oxygen Sensor Circuit High Voltage Bank1 Sensor Manufacturers constantly strive to build their vehicles to meet tougher emission standards each year. this can be a nightmare when trying to diagnose a check. How to fix a p0138 engine code: o2 sensor circuit high voltage bank 1 sensor 2the computer (ecm pcm) uses the upstream o2 sensor 1 to modify the air fuel mix. The p0138 dtc is a generic trouble code that says the oxygen sensor circuit (bank 1, sensor 2) is exhibiting higher voltage than normal. the powertrain control module (pcm) detects that the voltage coming from the sensor is higher than what the manufacturer specs illustrate. this heated oxygen sensor is found at the back of the catalytic converter. If you have encountered a p0138 code, there are a few steps you can take to diagnose the issue. here is a step by step process to help you identify the problem: check the o2 sensor voltage: using a multimeter, check the voltage output of the o2 sensor. the voltage should be between 0.1 and 0.9 volts.
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