P0401 Code (Symptoms, Causes, and How to Fix)

P0401 code

During the late 1970s, the automotive world underwent a series of rather monumental changes. A new found consciousness for environmental-related concerns led to a flurry of legislation aimed at curbing the output of exhaust-born pollutants.  This agenda ultimately led to the mandate of new emissions equipment, aimed at cleaning up engine exhaust. Of these components, … Read more

P0402 Code (Symptoms, Causes, and How to Fix)

P0402 code

Few vehicle-related issues can be quite as maddening as the sudden illumination of a check engine light. Issues of this type arise for a number of reasons, though the vast majority relate to operational or emissions failures. In essence, the onset of a check engine light is a vehicle’s way of calling attention to an … Read more

P0404 Code (Symptoms, Cause, and How to Fix)

P0404 engine code

The exhaust gas regulation (EGR) system enables cars to reduce smog emissions. Besides limiting smog emissions, the EGR is also responsible for controlling the engine temperature as well as the ratio of fuel-to-air. Any component failure in this system can activate the P0404 code. When troubleshooting the P0404 code, it is crucial to be thorough … Read more