As technology develops, negative effects on the environment are increasing. At this time, measures were taken to prevent the impact of toxic gases from engines on the atmosphere in order to protect the ecological balance. The engines are named EURO 1,2,3,4,5,6 according to their emission levels, and the engine systems are further developed in each ascending sequence.

As a result, the amount of toxic gases released was reduced and the atmosphere was protected. Here, the first main point was the preparation of the emission system by the factory, and the second, more serious point was that it depends on the person using the vehicle, equipment, unit. Engine systems must be serviced periodically as required by the manufacturer. Otherwise, malfunctions occur and the negative impact of exhaust gases on the atmosphere increases. Pollution of the atmosphere with toxic gases causes the short life of whatever is alive in nature.

So, the topic is control of the manufacturer's parameters of exhaust gases from the engine, their verification and troubleshooting.

Engine to DOC: After leaving the engine, the exhaust gases first enter the Diesel Oxidation Catalyst.

DOC Stage: Here, harmful gases such as carbon monoxide (CO) and hydrocarbons (HC) are oxidized to less harmful carbon dioxide (CO2) and water (H2O). This process also increases the temperature of the exhaust gas and helps in the subsequent DPF stage.

DPF Stage: The heated gases then flow to the Diesel Particulate Filter, where soot and soot are captured and burned periodically during regeneration.

SCR Stage: After particulate filtration, the gases pass to the Selective Catalytic Reduction unit. As you can see from the picture above, toxic gases pass through several parts before being released into the atmosphere, reducing the level of toxicity. In this regard, the parts that must be checked to ensure that the gases coming out of the engines are within the factory standard are listed below:

- Fuel tank cleanliness
- Timely replacement of fuel filters
- Stand of fuel injectors
- High pressure pump stand
- Timely replacement of the air filter
- Checking the condition of the air pipes
- Checking and cleaning the air cooler radiator
- Visual inspection of the turbocharger
- Cleanliness of measurement sensors on the air line (temperature, pressure)
- Cleaning the air intake manifold
- EGR inspection and cleaning

If the mentioned parts are not serviced on time, there will be serious malfunctions in the output part of the engine. In this case, it can lead to engine failure.