EGR Valve
02-18-2011, 12:21 AM
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EGR Valve
Can anyone send me schematics of the auxililary emission controls related to the P1491/P0401 codes? The third character of the code is the number 4, which is related to aux.emissions. So I need the diagram to track down the problem...so I'm told it could be anything from 1 to 20 things(via the guy who did the smog test).
