P0748 Fuel Pressure Regulator - Alfa Romeo Forum
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Join Date: Aug 2007
Location: Hull, UK
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2008 159 1.9JTDm

P0748 Fuel Pressure Regulator

I've got a recurring problem with my 2008 1.9JTDm. Before Xmas the car would cut out whilst driving along. Then it would restart and drive fine. The error code was P0748, fuel pressure regulator. This gradually got worse and worse, i.e. more frequent. I bought and fitted a replacement Bosch Fuel Pressure Regulator from a Bosch Service Centre over Xmas and the problem went away. Yesterday, it happened again. Same symptoms, same code. Repeated three times today.

I find it difficult to believe the new reg has failed so fast - but I suppose it's not impossible. Seems more likely that something else is either causing the regulator to fail or causing the same symptoms.

Could it be the wiring loom?
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