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  2. These 4 Most Expensive Mechanical Problems Plaguing Used Cars

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    Catalytic Converter Replacement. Replacing a catalytic converter is a pricey issue with used cars, often costing anywhere from $1,500 to $2,500 in the experience of Tomer Ruderman, founder and ...

  3. LA retiree gets shocking surprise 3 years after car’s ... - AOL

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    Hill had no idea that her replacement catalytic converter wasn’t CARB-approved. But now she has to buy a new one, which costs an average of $2,500, according to NADA. Doug Shupe told CBS News ...

  4. Catalytic converter - Wikipedia

    en.wikipedia.org/wiki/Catalytic_converter

    A three-way catalytic converter on a gasoline-powered 1996 Dodge Ram Simulation of flow inside a catalytic converter. A catalytic converter is an exhaust emission control device which converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction.

  5. Head gasket - Wikipedia

    en.wikipedia.org/wiki/Head_gasket

    This steam can damage the catalytic converter. If a very large amount of coolant leaks into the cylinders, then the engine can suffer from hydrolock, which can cause extensive engine damage. Combustion gas leakage. When the combustion gasses leak out of a cylinder, this causes a loss of compression, leading to power reduction or rough running ...

  6. Selective catalytic reduction - Wikipedia

    en.wikipedia.org/wiki/Selective_catalytic_reduction

    Commercial selective catalytic reduction systems are typically found on large utility boilers, industrial boilers, and municipal solid waste boilers and have been shown to reduce NO x by 70-95%. [1] More recent applications include diesel engines, such as those found on large ships, diesel locomotives, gas turbines, and automobiles.

  7. Secondary air injection - Wikipedia

    en.wikipedia.org/wiki/Secondary_air_injection

    When the catalytic converter is cold, air injected at the upstream point burns with the deliberately rich exhaust so as to bring the catalyst up to operating temperature quickly. Once the catalyst is warm, air is injected to the downstream location — the catalytic converter itself — to assist with catalysis of unburned hydrocarbons.

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