Welcome to the ultimate OBD2 Diagnostic Trouble Codes (DTC) reference guide. This comprehensive directory provides detailed breakdowns, meanings, and repair solutions for standard automotive fault codes mandated by the OBD2 protocol. Here you will find universal codes applicable to all makes and models, as well as manufacturer-specific trouble codes.
What is covered in our guides:
Code Definitions: Clear explanations of what each powertrain (P), body (B), chassis (C), and network (U) code means in plain English.
Common Symptoms: How your vehicle behaves when the code triggers (Check Engine Light, limp mode, rough idle, or drop in fuel economy).
Potential Causes: Step-by-step breakdown of faulty sensors, wiring issues, vacuum leaks, or mechanical failures.
Diagnostic & Repair Steps: Professional mechanic tips on how to safely troubleshoot and fix the issue yourself or prepare for a repair shop visit.
Use this search directory to decode your scanner’s readings, estimate repair costs, and keep your vehicle running smoothly.
Introduction The P0012 error code on Chery is a fairly common issue that many drivers face. Quick Summary: **The P0012 error code is often linked to a camshaft position sensor issue, indicating a severe problem that requires immediate attention to avoid engine damage.** **The urgency of repair is high, as it can lead to decreased…
Introduction The P0201 error code on Chery is a fairly common issue that many drivers face. Quick Summary: The **P0201 error** is often linked to a malfunctioning fuel injector circuit, specifically in cylinder 1. This issue can be considered **medium to high severity**, as it may cause decreased engine performance and potentially lead to further…
Introduction Encountering the P0031 code in your Geely? Here is a complete guide to its causes, symptoms, and solutions. Quick Summary: The **P0031 error** is most likely caused by a faulty oxygen sensor heater circuit, which is a **medium severity** issue that requires **prompt repair** to avoid damaging the engine or other components. The **Geely…
Introduction Let’s break down exactly what the P0102 trouble code means for your Geely and how to fix it. Quick Summary: The **P0102 error** is often linked to issues with the Mass Air Flow (MAF) sensor, which may be associated with faulty wiring, corrosion, or a malfunctioning sensor itself. This code is considered a moderate…
Introduction Encountering the P0306 code in your Geely? Here is a complete guide to its causes, symptoms, and solutions. Quick Summary: The P0306 error is most likely caused by a faulty spark plug or ignition coil, resulting in a moderate severity level. Repairing the issue is urgent as it can lead to further engine damage…
Introduction The P0117 error code on Haval is a fairly common issue that many drivers face. Quick Summary: The **P0117 error** is often linked to a faulty engine coolant temperature sensor, which may cause the engine to run rich, leading to decreased fuel efficiency and potential engine damage. The **severity level** of this issue is…
Introduction Let’s break down exactly what the P0131 trouble code means for your Haval and how to fix it. Quick Summary: The P0131 error is often linked to a low voltage reading from the oxygen sensor circuit, which **may be associated with** a faulty oxygen sensor, wiring issues, or exhaust system leaks. The severity level…
Introduction Encountering the P0122 code in your Changan? Here is a complete guide to its causes, symptoms, and solutions. Quick Summary: The **P0122 error** is often linked to a faulty throttle position sensor, which may cause engine performance issues. The severity level of this code is medium, and the urgency of repair is soon, as…
Introduction The P0404 error code on Changan is a fairly common issue that many drivers face. Quick Summary: The **P0404 error** is often linked to a malfunction in the exhaust gas recirculation (EGR) system, which may lead to decreased engine performance and increased emissions. The **severity level** of this issue is generally considered medium, as…
Introduction The P0A7E error code on BYD is a fairly common issue that many drivers face. Quick Summary: **The P0A7E error code is often linked to the battery pack overheating, which can be caused by various factors such as faulty thermal management systems or excessive charging/discharging cycles.** **The severity level of this code is medium…