The voltage signal must be constant for oxygen sensors to work properly. Low voltage can negatively impact the sensor. P0136 indicates that a sensor behind the catalytic convertor is experiencing voltage issues. The load is spread across the other O2 ...
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
P2096 Post-Catalyst Fuel Trim System is Too Lean on Bank 1 Fault: What is it?
The air-fuel ratio of your vehicle is crucial to the performance of its engine. You could damage your engine if your vehicle doesn’t have the right air-fuel mixture ratio. The P2096 code indicates that there is an issue with the ...
P0009 Engine Position System Performance Bank 2 Fault: What is it?
The mechanical timing of the motor is the subject of fault code P0009. Fault code P0009 will be triggered if, during a test by the Engine Control module (ECU/ECM/PCM), a misalignment between the crankshaft and camshaft is detected in the ...
P0008 Engine Position System Performance Bank 1 Fault: What is it?
The mechanical timing of the motor is the subject of fault code P0008. The Engine Control Module (ECU/ECM/PCM), during its test, detects misalignment of the camshafts and crankshafts in cylinder 1. Fault code P0008 will be triggered. Engine control module ...
P3400 Cylinder Deactivation System (Bank 1) Fault: What is it ?
What is P3400 fault code all about? What causes the P3400 error code? How do you fix the P3400 error code? What does the Cylinder Deactivation System Bank 1 Fault mean? Many drivers find it difficult to diagnose the problem ...
P0011 Camshaft Position Timing is Over-Advanced or System Performance (Bank 1): What is it?
P0011 can be seen on any vehicle with an OBD-II. It is related to components that control variable valve timing (VVT), or variable camshaft time (VCT). It can therefore only be seen on vehicles that have these systems. Toyota, Volkswagen ...
P0449 Evaporative Emission Control (EVAP) System Vent Valve/Solenoid Circuit Malfunction
The P0449 code is a generic fault code that indicates a problem with the circuit controlling ventilation in your vehicle’s Evaporative Emission System. The ECU will illuminate the engine fault lamp if a fault is detected in the solenoid or ...
P0014 Camshaft Position B – Timing Over-Advanced or System Performance (Bank 1): What is it ?
P0014 is an error code that refers to variable camshaft time. The P0014 code is generated by the engine control module when it detects an issue with the timing of exhaust camshafts and valves. This code is found in vehicles ...
P0401 Insufficient EGR Flow Detected Fault: What is it ?
The P0401 code is a generic fault code that applies to the powertrain components of your vehicle. This code indicates an emission problem, but the exact solution depends on the make and model of your vehicle. EGR is short for ...
P0440 Evaporative Emission Control System Malfunction: What is it?
Engine control module (ECM/PCM/ECU), if it detects fuel tank vapour leakage (EVAP), or receives an unfavorable signal from the pressure sensor, will generate fault code P0440. The Evaporative Emissions Control System (EVAP), which is made up of fuel lines and ...