The positive crankcase ventilation system was one of the earliest emission-control devices. It draws leftover combustion gases from the crankcase (the oil pan and bottom of the engine) and routes them back into the engine, where they’re burned in the combustion chambers instead of escaping into the atmosphere.

Oxygen sensors are a critical component of the fuel and emissions systems because they monitor the amount of oxygen in the exhaust and transmit that information to the engine computer, which adjusts the air-fuel mixture accordingly

vehicle Idling Diesel-Exhaust

Rust is the No. 1 enemy of exhaust systems, but it is by no means the only one. For example, bottoming out over bumps, driving on bad roads  can cause physical damage to car parts; mufflers can get clogged by internal parts coming loose; and a faulty oxygen sensor, an in expensive part on many…

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