Just changed engine.bought a reman and had it installed 2 mths ago
A common problem for egr failures are the modulator valves, the valve is attached directly to the egr valve, it's a round plastic housing with three vacuum lines on it, try replacing this valve.
SOURCE: OBD code 0401 (1997 Toyota Camry 4 cyl)
There is a VSV (vacuum switching valve) , usually mounted on the back side of engine block, under the intake manifold, as well as the map sensor, that can also cause that code if one or the other is faulty. It takes some pretty detailed troubleshooting to confirm this in some cases, so if that's not in your line of work, you may have to have it properly diagnosed, or take a 50/50 shot at which one first.
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