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Now the P0401 appeared again and it is intermittent.
My P0401 was intermittent for ~1yr, then it came on one day and wouldn't go off. Reset, 2-trips, then MIL=P0401. Every single time. Replaced the VSV for EGR about ~4 years ago and no problems since (knock on wood)
Great work Raven! It's OK with us if you forget about getting a real job and just continue your unshaven, unwashed, heathenistic days of posting great information here in the 80 section.
-B-
I replaced the modulator and haven't had the code again.