The code P0138 (https://www.yourmechanic.com/article/p0138-obd-ii-trouble-codes-o2-sensor-circuit-high-voltage-bank-1-sensor-2-by-jay-safford) is on for two possible different situations. Either the oxygen sensor has shorted out on the exhaust system or the wiring from the battery to the sensor has a short or break in it. Check the...
Hello. Codes like these can be tricky, because they give us a warning that the voltage readings are out of range, but they do not tell you why. The high voltage reading is showing that the air/fuel mixture being processed...
Hi there. Check the Exhaust Gas Recirculation (https://www.yourmechanic.com/services/exhaust-gas-recirculation-egr-valve-replacement) valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the...
Hi, thanks for writing in. I wouldn't worry about it. The only purpose of the downstream O2 sensor is to monitor the health of the catalytic converter. You have four O2 sensors. The two upstream sensors monitor fuel mixture (Bank...
