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  1998 Pontiac Sunfire with EGR Valve recently replaced.
by Seth   
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  1991 volvo 780 turbo 2.3 L, nox emissions were really high other emissions were good
by eric   
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  EGR Valve Test - Subaru Outback Legacy 1999 2.5 Liter Engine Failed EGR Test.
by Bernie   
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