The P0146 is a generic OBD-II powertrain trouble code. Its official definition is “O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 3)”.
USB OBD2 scanners are mainly divided into two categories: USB adapters that require connection to a computer/phone, and standalone scanners with built-in screens (usually also with USB ports for updates). Below is a detailed classification and purchasing guide.
Popular USB OBD2 Scanners Recommended
USB Adapter (for computer connection)
Standalone Scanner (with USB port)
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Multi-functional OBD2 Scanner
How to Choose? Based on your main needs
The most economical option is to use a USB OBD2 scanner if you don’t mind using a computer.
Fast barcode reading, convenient: Handheld OBD2 Scanner
For serious brand enthusiasts: Choose the corresponding series of Professional OBD2 Scanners.
Preferred for home users: OBD2 Scanners for Beginners
The P0144 is a generic OBD-II powertrain trouble code. Its official definition is “O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)”. This code is stored by the vehicle’s Engine Control Module (ECM) when it detects that the signal voltage from a specific oxygen sensor is persistently and abnormally high, typically near the reference or battery voltage level. The sensor designation is key: “Bank 1” refers to the side of the engine containing cylinder number 1. “Sensor 3” is not a standard upstream or primary downstream sensor; it is an additional sensor found in some vehicles, often a secondary downstream monitor.
The fault code P0000 within the OBD2 (On-Board Diagnostics II) system is a special case. It indicates that no faults have been logged, meaning it does not represent a specific error. This code most commonly appears when a scanner or diagnostic system fails to detect any issues with the vehicle’s systems.
The P002A fault code, applicable to all car manufacturers, means “B Camshaft Profile Control Circuit/Open (Bank 1)”.
The P0022 fault code, applicable to all car manufacturers, means “A Camshaft Position – Timing Over-Retarded (Bank 2)”.
The P0021 fault code, applicable to all car manufacturers, means “A Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)”.
The P001E fault code, applicable to all car manufacturers, means “A Camshaft Profile Control Circuit Low (Bank 2)”.
The P0019 fault code, applicable to all car manufacturers, means “Crankshaft Position – Camshaft Position Correlation (Bank 2, Sensor B)”.