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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.

Asked by for the 2009 Volkswagen Touareg TDI
seek diag and est from a mech