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Oxygen sensor reactions with a plugged exhaust
Posted to Technical Theory Forum on 8/28/2007 32 Replies

Hi TTF,

Im having a hard time rapping my head around a trend that I'm noticing. The vehicle in question is a 1999 Mercury Cougar with a 2.5L V6. It has three catalytic converters. The front two are part of the exhaust manifolds on their respective banks. The... Login to read more.

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