Error codes

OBD-II Trouble Code: P0420 Catalyst System Efficiency Below Threshold (Bank 1)

P0420 Fault Code: Catalyst System Efficiency Below Threshold

If your car's computer (PCM) triggers a P0420 fault code, it means it has detected a problem with the catalytic converter. The operation of the catalytic converter is to break down harmful pollutants created during the combustion cycle, thereby reducing the emissions expelled from the exhaust pipe.

2nd November, 2025

OBD-II Trouble Code: P0401 Exhaust Gas Recirculation Flow Insufficient

Error codes

How To Diagnose and Fix OBD P0401 Fault Code: EGR Flow Insufficient

Also known as insufficient EGR flow, this particular OBD-II trouble code indicates the engine control module (ECM) has detected the exhaust gas recirculation (EGR) valve is not allowing sufficient flow of recirculated exhaust gases into the engine. At this point, the P0401 error code is set. These recirculated exhaust gases are required in the engine's combustion chambers to decrease the combustion temperature, reducing the formation of nitrogen oxides.

5th November, 2025

Error codes

Troubleshooting OBD-II Code P0300: Random/Multiple Cylinder Misfire Detected

When a P0300 trouble code is triggered, it indicates that misfiring occurs in random or multiple cylinders. This happens when there is a deficient amount of fuel being burned within a cylinder. Most cars have between four and six cylinders, with each cylinder firing a spark plug continuously and smoothly. The spark plug fires a spark igniting the fuel-air mixture within the cylinder, and if this process isn't working correctly, a misfire occurs. If more than one cylinder misfires, revolutions per minute of the crankshaft (RPM) will increase or decrease and if either is more than 2%, the powertrain control module (PCM) will activate and store the P0300 code. Alternative OBD-II codes such as P0301, P0302, P303 indicate specific cylinders are misfiring rather than random or multiple cylinders.

5th November, 2025

OBD-II Diagnostic Code: P0171 System Too Lean (Bank 1)

Error codes

How to fix code P0171: System Too Lean Bank 1 - What does it mean and common causes

For engines to run efficiently, they maintain the manufacturer's optimum air-fuel mixture ratio, and when this doesn't happen, a lean condition exists, triggering a P0171 code. This lean condition occurs when the engine is receiving either too little fuel or too much air. The cause is either a weak fuel system on the engine's first bank that doesn't add sufficient fuel in the air-fuel mix or a vacuum leak introducing more air into the mixture.

10th November, 2025

OBD-II Trouble Code: P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

Error codes

How to fix OBD code P0135: O2 Sensor Heater Circuit Malfunction

O2 sensors are heated and contain heating elements to help them achieve operating temperature quickly. When the OBD-II trouble code P0135 is activated, it is indicating that the engine control module (ECM) has detected a problem with the O2 sensor heater circuit bank 1 sensor 1. O2 sensors are typically mounted directly onto the exhaust pipe near the catalytic converter, giving feedback to the ECM to control the injectors correctly. When a P0135 code is activated, the ECM remains in an open loop, meaning reduced fuel economy until the exhaust gets hot enough to activate the O2 sensor into giving voltage output.

13th November, 2025

Error codes • Warning lights

How to fix OBD P0113 Code: Intake Air Temperature Circuit High Input

When the error code P0113 is triggered, it indicates that the powertrain control module (PCM) has received a higher voltage signal than expected from the intake air temperature (IAT) sensor, indicating a problem with the IAT sensor 1 or its circuit. The PCM monitors air intake temperature by sending a stable 5-volts to the IAT sensor. This sensor, in turn, uses a thermistor to measure the intake air temperature. If the temperature remains normal, the thermistor will have some resistance meaning the output voltage to the PCM will be below 5 volts. A P0113 OBD-II trouble code is triggered when the voltage signal to the PCM is higher. This particular trouble code is most often associated with P0111, P0112, and P0114 codes.

7th November, 2025

OBD-II Trouble Code: P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

Error codes

OBD-II Code P0106: Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Issue

The P0106 trouble code generally means an issue with the MAP circuit having incorrect output range issues or a problem with engine performance. The diagnostic code is set when either the Power Train Control Module (PCM) detects an abnormal signal voltage from the Manifold Absolute Pressure (MAP) sensor relating to the current throttle position or engine load or a signal voltage that does not show a good relationship with the MAP sensor. The MAP sensor is integral to the fuel injection system, providing signals to the Engine Control Unit (ECU) to allow smooth operation, good fuel economy, and proper performance and power. The P0106 diagnostic code is generally activated more commonly on vehicles with higher mileage of over 100,000 miles.

4th November, 2025

OBD-II Trouble Code: P0016 Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

Error codes

Everything you need to know about OBD-II fault code P0016 and how to fix it

When a P0016 OBD-II generic code is triggered, it alerts the driver that the camshaft position sensor (CMP) for bank 1, which detects camshaft rotation, is not corresponding to the crankshaft position sensor (CKP) signal.

3rd November, 2025

Error codes

OBD P0010 Code: Intake Camshaft Position Actuator Circuit Troubleshooting Guide

The P0010 diagnostic trouble code is associated with vehicles equipped with VVT or Variable Valve Timing. Most VVT systems are triggered by the oil control valve (OCV), also called a solenoid valve. The P0010 code is generated when the ECM (engine control module) attempts to adjust the bank 1 intake camshaft timing, usually during higher speeds, by utilising one of these valves and detecting a low voltage circuit in the OCV.

13th November, 2025