P0420 - Catalyst System Efficiency Below Threshold (Bank 1) ByAdmin-January 05, 2025 The trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1) is a common diagnostic code that vehicle owners may encounter when their check engine light illuminates. This code indicates an issue...
This is the “fine” description of the trouble code and for example, P0420 means there is an issue at Bank 1, while the code P0421 means the issue is at bank 2. While the engine codes are quite logical, it’s very difficult to remember all of these OBD codes. I’ve created a ...
What Are Diagnostic Trouble Codes (DTC)? The codes produced from the OBD are known as fault codes or diagnostic trouble codes. OBD codes identify a problem within the broader system, such as the chassis, body, powertrain or network, whereas a DTC code addresses an issue in a specific area...
Vehicle Speed MPH/Km/h 0 Note: Viewing the PID screen on the scanner is useful in determining if a problem is occurring at the present time TROUBLESHOOTING USING DIAGNOSTIC TROUBLE CODES Pinning down causes of the actual problem can be accom- plished by trying to set the opposite code. Fo...
P0234 Error Description Supercharger Overboost Condition The PCM disables (bypasses) the supercharger boost and sets a diagnostic trouble code (DTC) to keep from damaging the powertrain (engine or transmission) during potential harmful operating conditions. Brake torque (brake on and throttle at wide...
What is a standard OBD2 trouble code? Standard OBD2 trouble codes are diagnostic codes used across all car brands and models equipped with an OBD2 system. These codes typically begin with a letter followed by four digits (e.g., P0301). The initial letter indicates the system related to ...