Toyota Mirai P0139: O2 Sensor Slow Response (Bank 1 -Sensor 2)

P0139 is a common OBDII code that occurs in many vehicles, including the Toyota Mirai. The code is triggered when there is an issue with the response time from the oxygen (O2) sensor when switching voltage levels. The Oxygen sensors are responsible for helping the ECM meter oxygen levels in the exhaust, and helping to … Read more

Toyota Mirai P0140: O2 Sensor → No Activity Detected B1S2

P0140 is a generic OBDII trouble code. It has the same meaning for any vehicle with OBDII, including the Toyota Mirai. It means that the PCM/ECM is not detecting any activity from the sensor.  It doesn’t mean that the O2 sensor isn’t getting power, but that the voltage isn’t changing, which is the “no activity”. … Read more

Toyota Mirai P0151 Code: Meaning, Causes, How to Fix

The P0151 code is an OBD-II diagnostic trouble code that indicates low voltage in the Toyota Mirai’s Oxygen (O2) sensor circuit located at Bank 2, Sensor 1 (B2S1). The B2S1 O2 sensor plays a crucial role in maintaining optimal engine performance by detecting the air-fuel ratio in the exhaust, then sending this data to the … Read more

Toyota Mirai P0134: O2 Sensor → No Activity Detected B1S1

P0134 is a relatively common OBDII trouble code. It’s generic, which means that it has the same meaning for any vehicle with OBDII. It means that the PCM/ECM is not detecting any activity from the sensor.   P0134 Definition P0134: O2 Sensor → No Activity Detected →Bank 1 Sensor 1 The Mirai’s computer uses the … Read more

Toyota Mirai P0403:EGR→ Circuit Malfunction

P0403 is a very common trouble code. It is a generic code, which means that it has the same meaning for the Toyota Mirai as it would any other vehicle. It affects the EGR (Exhaust Gas Recirculation System and technically means: P0403: EGR→ Circuit Malfunction A circuit malfunction implies that there is a wiring problem … Read more