The exhaust system starts with the exhaust manifold and the associated manifold gasket. An exhaust manifold usually lasts the life of a car. From the manifold, the exhaust gases are directed through the individual openings into the so-called Y-pipe. Installed on or in the Y-pipe is the flex pipe, which consists of a wire mesh. It can move easily and thus absorb and cushion the vibrations of the engine block. At the same time, it is also susceptible to damage and corrosion. In most vehicles, the Y-pipe also houses the lambda sensor. This reports the composition of the exhaust gases and so the mixing ratio of air and fuel can be optimized.
In gasoline engines, the catalytic converter now follows and serves as a filter, which filters out large parts of the toxins. In diesel engines, this is usually followed by the soot particle filter. In both diesel and gasoline engines, the AGR valve is also installed between the exhaust system and the intake tract. In the case of diesel, exhaust gas recirculation serves to reduce nitrogen oxide by lowering the combustion temperature. Gasoline engines benefit from EGR because the admixture of exhaust gases reduces fuel consumption.
A brief overview of the exhaust gas purification of the two engines:
The formation of carbon dioxide cannot be prevented in gasoline engines. The catalytic converter, however, reduces the pollutants by converting carbon monoxide into carbon dioxide and nitrogen oxides into nitrogen. The catalytic converter contains a body made of ceramic, which is constructed in the form of a honeycomb. The precious metals platinum, rhodium and palladium are built into the ceramic, which additionally bind the harmful substances.
Soot formation is the biggest problem in diesel engines. The soot particle filter or diesel particulate filter (DPF) filters the particles out of the exhaust gas. A sensor determines the regeneration phase. Then the DPF heats up and the fine dust particles are burned off.
The catalytic converter or diesel particulate filter is followed by the pre- and mid-silencer, where mainly the vibrations are reduced and the exhaust gas flow is reduced. The final component in the exhaust system is the final muffler. Here, vibrations are further reduced by damping material and the exhaust gases are divided into several chambers, reducing each other's sound waves. Condensation collects in the exhaust system, which is spewed out at the end together with the exhaust gases.
The high loads on the exhaust system can lead to defects. These are either broken components such as the lambda sensor, soot particle filter or catalytic converter, or leaks in the exhaust pipe and exhaust. The latter is noticeable by louder noises at the exhaust or also by wet spots under the car. A rattling at the exhaust system is often an indication of a loose bracket or a broken catalytic converter. A visual inspection will often show where the damage is. Small open or leaking areas can be sealed with a exhaust repair paste or, alternatively, welded. Brackets are also quickly changed on an exhaust system.
However, if the defect is not on the outside of the visible parts of the exhaust system, the repairs are somewhat more complex. Increased fuel consumption or loss of power, for example, indicate broken parts such as the lambda sensor and DPF. Also dark exhaust gases are an indication of a defect located in the exhaust system. In the cases, the repair of the exhaust system is possible only with appropriate expertise.
In any case, rely on high-quality spare parts. These do not necessarily have to be original parts from the vehicle manufacturer. These often only obtain parts from reputable suppliers. It is therefore worth buying branded goods in OEM quality. It is significantly cheaper than the original parts but still of the same quality. Thus, the newly installed spare parts from the exhaust system last a long time and you still save money. To find the right parts for the exhaust system, it is best to select your vehicle with us. Then you will be shown only suitable parts. If you are unsure which spare part you need for your exhaust system, simply contact our customer service with the 17-digit chassis number.
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