1998 Acura TL Q&A
1998 Acura TL Question: Check engine light
The code P1491 is an EGR Valve Position Sensor code, not a code for plugged ports, so most of the time this means that either a piece of carbon has clogged your valve and it can't close properly or that the Position Sensor on the Valve is worn out. Best to have a savy tech do a scan of the EGR valve data to see if the valve is closing, any idle problems? A sticking valve may cause a rough idle, though the computer will compensate pretty well. - dandd
I believe you said that the diagnosis you received was a hold in a hose, which I believe can cause an EGR code. - matte
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