Modern vehicles are equipped with a diagnostic system that makes it easier to identify faults. You can get a fault code for your vehicle using a special tool. This will tell you what the problem is. In theory, the system ...
Category: Diagnostic Trouble Codes
Welcome to our Diagnostic Trouble Codes Blog — your reference point for understanding what your car’s fault codes really mean.
Discover clear, easy-to-follow articles explaining OBD-II codes, common causes, symptoms, and recommended fixes across all major vehicle systems.
From check-engine lights and sensor faults to emissions and drivability issues, our content helps you move from code to cause with confidence.
Learn how to interpret fault codes correctly, avoid unnecessary repairs, and diagnose problems the smart way.
Ask4Auto Latest Articles
P0606 PCM/ECM Processor Fault: What is it?
The engine control module and power transmission components play an important role in the regulation of the operation of modern vehicles. The PCM/ECM monitors every aspect of a vehicle’s electrical and engine system. To ensure that the engine runs safely, ...
P0725 Engine Speed Input Circuit Fault
The powertrain control module (PCM) is a component in your vehicle. This component controls the entire engine and transmission. To do its job, the PCM relies on a number of sensors. P0725 indicates that one of the sensors is malfunctioning. ...
P0700 Transmission Control System Malfunction
P0700 is a generic fault code that applies to all vehicles equipped with OBD-II. The transmission control module (TCM), which is part of the automatic transmission, is the source. P0700 is a code for informational purposes. The P0700 code does ...
What is P1151 fault code how to fix it?
This code is unique to Fords. The heated oxygen sensor (HO2S) is responsible for triggering this code. This sensor is used for ensuring the correct fuel/air ratio, and testing the oxygen content. Insufficient air mixing with fuel results in an ...
What is the P2002 Diesel Particulate Filter Efficiency Below Threshold (Bank 1) Fault?
The emission system is affected by the fault code “P2002 diesel particle filter efficiency below threshold”. Diesel vehicles produced in 2007 or later are equipped with an exhaust system that includes a diesel particulate (DPF) filter to reduce soot emissions. ...
What is P1000 Code ? How to fix it ?
This code, although it can have many meanings, is a sign of a driving cycle fault or an OBD-II test failure, depending on the vehicle manufacturer. This code is manufacturer-specific and is commonly found in Ford and Jaguar models. Mazda ...
What is P2004 Intake Manifold Runner Control (IMRC) Stuck Open Fault?
What is the fault code P2004 for? What is the Intake Manifold Runner Control Stuck/Open Bank 1 fault? How to rectify fault code P2004? What are the symptoms of and causes for fault code P2004? What is P2004 Fault Code? ...
How to Fix Fault Code P2135?
What is the fault code P2135? How do I fix the Throttle position sensor A and B Sensor signal mismatch (Correlation error) fault? What is the cause of fault code P2135? What are the symptoms and solutions to fault code ...