Transmission kicks down, oil pressure light comes on w/engine fault, service now on 2009 Volkswagen Touareg TDI

Every time the transmission kicks down, the oil pressure light comes on w/ do not exceed 2,500rpm, engine fault, service now. The codes P13D3, P13DC,P164B all came on. The 2 integrated cylinder pressure sensor glow plugs and Oil pressure switch were changed. What can be wrong now. Please advise, Thanks.

by in New York, NY on September 16, 2013
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1 answer
ANSWER by , September 17, 2013
seek diag and est from a mech