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Originally Posted by db17
Behind the drivers rear wheel and up inside the rear fender well there is a black box with two or three vacuum lines attached to it. It is part of the emissions system and they are often the cause of "ghost" ses lights coming on. It may be leakig and will need replacement if so. It is available from the dealer for about $65.
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Could this problem also cause an engine misfire condition? My Impala just crossed 80,000 and I just replaced my catalytic converter because it was stopped up. The only trouble code that keeps occurring is "Catalyst system below efficiency threshold" (Code 420). The check engine light flashes to indicate a misfire and I feel a definate misfire when accelerating (only when rolling on the throttle at about 1500 rpm or under WOT at 3500-4000 rpm. Previously, it threw a code for a cylinder #1 misfire (before the cat trouble) amd I traced that back to a malfunctioning coil pack. ( I also replaced this spark plug twice and the wire is in good condition) I'm also checking out the fuel injectors and Oxy sensors. Any help would be appreciated.