Jul 10, 2023 - 03:35 PM
The trouble code P0138 stands for O2 Sensor Circuit High Voltage (Bank 1, Sensor 2). The code is set when your car’s primary computer—also called the powertrain control module (PCM)—detects that, for a given period, the voltage signal from the rear/downstream O2 sensor is too high. Please replace the downstream/rear oxygen sensor. For more info about this code, click this link from our CarParts knowledge database for your reference. While the code P0420 stands for “Catalyst System Efficiency Below Threshold (Bank 1).” This code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter (very common problem). You need to replace the bank 1 catalytic converter (click this link for your reference). I hope this helps!
Jul 13, 2023 - 09:34 AM