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OBDII Trouble Codes
On-Board-Diagnostic (OBD) trouble codes are one way your vehicle communicates with a mechanic. Every car built since 1996 has an OBD computer system that monitors and identifies issues. In particular, it looks for issues that may result in harmful and polluting emissions from exhaust gases. When this system identifies an issue it turns on the check engine light and records an OBD code.
OBD codes are accessed by plugging a code reader into the vehicle's OBD port. These codes provide a mechanic with information about the system and the conditions under which the issue was first identified. However, they can't provide a clear-cut solution to the actual cause of the problem - only clues for where to look. To learn more about what your car is trying to tell you, choose your code below.
Most Common OBDII Codes:
P0128: Coolant Thermostat (Coolant Temperature Below Thermostat)
P0171: System Too Lean
P0174: System Too Lean
P0300: Random/ Multiple Cylinder Misfire Detected
P0401: Exhaust Gas Recirculation "A" Flow Insufficient Detected
P0420: Catalyst System Efficiency Below Threshold
P0440: Evaporative Emission System
P0442: Evaporative Emission System Leak Detected (small leak)
P0455: Evaporative Emission System Leak Detected (large leak)
Other OBDII Code Categories:
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