2005 vollvo s-40 2.4 engine fuel injected. codes p0089 & p0172, replaced fuel pressure regulator & fuel pump. fuel pump still making whiny noise. same codes after replacement
P0089 Fuel pressure system signal too low
P0172 Fuel trim too rich Bank 1
Fuel pressure signal comes for the fuel pump control module the fuel pump module is located near the fuel tank
This is not uncommon to misdiagnose as a fuel pump problem
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