IntroductionThe exhaust system has two main functions: first, to provide a conduit for the rapidly expanding gasses of combustion, and second, to quiet the noise and cool the temperature of the exhaust. On cars equipped with a catalytic converter, the exhaust system and the emission control system remove most of the pollutants resulting from combustion. Exhaust system function depends on each component being free from holes, with airtight seals at all joints. Emission control system function depends on proper adjustment of the fuel injection system and the ignition system, as well as on the action of the catalytic converter. Any misadjustment of the fuel injection or ignition systems can adversely affect the emission control system. During operation, all exhaust system components are subjected to extremes in temperature and pressure, vibration, and damaging contact with all manner of road hazards. Even though the exhaust system is designed for relatively maintenance-free operation, the environment to which it is exposed means that regular inspection is warranted. The only scheduled recommended emission control maintenance is the replacement of the oxygen sensor. This section covers the maintenance, troubleshooting, and repair of the exhaust system and the emission controls. Special tools are required to remove and install the front pipe spring clamps on certain models, but otherwise only basic hand tools are required for complete servicing. Testing of the emission control system requires special equipment and skills. If you lack the necessary skills or equipment, we suggest you leave these tests or repairs to an authorized Volkswagen dealer or other qualified and properly equipped repair shop. We especially urge you to consult your authorized Volkswagen dealer service department before attempting any repairs on a car that may be subject to Volkswagen's warrant coverage. |
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