Category: Auxiliary Emissions Control

Here we will discuss codes related to the auxiliary emissions system. These consist of the EGR (exhaust gas recirculation), catalytic converter, and EVAP (Evaporative Emissions). These systems help minimize the damage your vehicle does to the environment. The EGR system does this by recirculating the exhaust fumes into the intake which, surprisingly, cools down the combustion chamber and causes less nitrogen oxide (NOx) emissions. The catalytic converter is, in a sense, a filter that cleans up the harmful exhaust gases produced by the engine by turning them into less harmful gases. It does this through the use of platinum, palladium, and rhodium. It changes nitrogen oxide into nitrogen and oxygen, carbon monoxide to carbon dioxide, and unburnt hydrocarbons to carbon dioxide and water. The EVAP system catches the fuel vapors from your fuel tank and allows your engine to burn them.

P0401 – Meaning, Causes, Symptoms, & Fixes

Code P0401 Definition Exhaust Gas Recirculation (EGR) Flow Insufficient Detected Code P0401 Meaning The exhaust gas recirculation (EGR) recirculates small amounts of exhaust back into the combustion chambers of the engine in order to decrease the combustion temperature, thereby reducing the formation of smog-producing nitrogen oxides. EGR valves can malfunction by becoming stuck open or...

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