P0440 – Evaporative Emission System
The P0440 OBD2 code is one of the most common. It indicates a malfunction in your EVAP system, and is normally very easy to fix. Learn how to diagnose and repair this pervasive diagnostic code.
OBD2 Codes
P0340 – Camshaft Position Sensor “A” Circuit
The P0340 OBD2 code means there’s a problem with your car’s camshaft position sensor. Learn how you can further diagnose and repair this potentially issue.
P0455 – Evaporative Emission System Leak Detected (large leak)
The P0455 OBD2 code tells you there’s a leak in your EVAP system. Learn how to further diagnose the problem and what steps to take to fix it.
P0456 – Evaporative Emission System Leak Detected (very small leak)
The P0456 OBD2 code indicates a leak in your EVAP system. Learn what this means and how to diagnose and clear this trouble code.
P0446 – Evaporative emission system vent control circuit
The P0446 OBD2 code indicates a problem with the EVAP vent control circuit. Learn how to diagnose this code and what steps you need to take to clear it.
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
The P0420 code suggests an underperforming catalytic converter. Learn about this code’s possible causes, likely symptoms, and solutions.
P0169 – Incorrect Fuel Composition
Filling up a car’s fuel tank with wrong fuel is a common mistake people do on the fuel stations. P0169 is the most widely used OBD2 DTC code for wrong fuel composition.
