Mazda 3 P0421 Code: Meaning, Causes, How to Fix

P0421 is a relatively rare OBDII trouble code.   It’s generic, which means it has the same definition for the Mazda 3 as it would any other vehicle. It is technically defined as “Warm Up Catalyst Efficiency → Below Threshold (Bank 1)”. In layman’s terms, it indicates that your Mazda 3’s catalytic converter is not scrubbing pollutants efficiently … Read more

Mazda 3 P0316: Engine Misfire → At Startup

A relatively common, yet difficult to diagnose OBD-II trouble code is P0316. It has the same meaning for the Mazda 3 as it would any other vehicle.  It indicates that there is a misfire at the startup of the vehicle, and that it happens within the first 1000 revolutions of the engine. P0316: Engine Misfire … Read more

Mazda 3 P0740: Torque Converter Clutch Circuit Malfunction

P0740 is one of the most common transmission trouble codes. It means that the 3‘s computer has detected that there is an issue with the torque converter clutch (TCC) solenoid circuit.     P0740: Torque Converter Clutch Circuit Malfunction   The TCC “locks” the drivetrain, which allows for a true mechanical connection between the transmission … Read more

Mazda 3 P0160: O2 Sensor → No Activity Detected B2S2

  P0160 is a standard OBDII trouble code. It has the same meaning for any vehicle with OBDII, including the Mazda 3. When a vehicle has P0160, 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 … Read more

Mazda 3 P0410: Secondary Air Injection System → Malfunction

P0410 is a generic OBDII trouble code.  This means that it has the same meaning for the Mazda 3 as it would any other vehicle.  It is letting you know that there is an issue with the secondary air injection system. P0410: Secondary Air Injection System → Malfunction  The secondary air injection system injects air … Read more

Mazda 3 P0506: Idle Air Control – RPM Lower than Expected

  P0506 is a common OBDII trouble code. It is typically triggered when the engine idle speed is lower than the predetermined limit set by the manufacturer. It is a generic code, which means that it has the same meaning for the Mazda 3 as it would any other vehicle.    P0506 Symptoms:  3 Most … Read more

Mazda 3 P0505: Idle Air Control System- Malfunction

P0505 is an OBDII code that deals with the idle air control system in the Mazda 3.  It’s a generic code, which means that it has the same meaning for the 3 as it would any other vehicle (3 or not). P0505:  Idle Air Control System:  Malfunction When P0505 is triggered, it is typically caused … Read more