Fiat 500 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 Fiat 500 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 Fiat 500’s catalytic converter is not scrubbing pollutants efficiently … Read more

Fiat 500 P0740: Torque Converter Clutch Circuit Malfunction

P0740 is one of the most common transmission trouble codes. It means that the 500‘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

Fiat 500 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 Fiat 500. 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

Fiat 500 P0410: Secondary Air Injection System → Malfunction

P0410 is a generic OBDII trouble code.  This means that it has the same meaning for the Fiat 500 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

Fiat 500 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 Fiat 500 as it would any other vehicle.    P0506 Symptoms:  500 Most … Read more

Fiat 500 P0505: Idle Air Control System- Malfunction

P0505 is an OBDII code that deals with the idle air control system in the Fiat 500.  It’s a generic code, which means that it has the same meaning for the 500 as it would any other vehicle (500 or not). P0505:  Idle Air Control System:  Malfunction When P0505 is triggered, it is typically caused … Read more