Why is the check engine light on? on 1997 Toyota RAV4

Within the past three weeks, I have paid $1500 to get an Oxygen sensor replace, EGR valve, EGR modulator, and VSV replaced on my 1997 RAV4 for a check engine light problem. However, after getting all of these repairs, the engine light is still coming on. Code PO401.

by in Dallas, TX on December 15, 2012
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