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Fault code

P0089 fault code.

This code comes up with one known fault.

Generic code

Code type

Engine and drivetrain

System

Fuel pressure does not reach the requested value

The engine control unit regulates the fuel pressure through a valve. The measured value does not follow the requested one. The regulator valve or the high pressure pump can be at fault.

The code tells you what the control unit measured, not which part has failed. The same code has several possible causes.

Which known faults it comes up with

N54 / N55: high pressure fuel pump

expensive

This is the most common N54 fault, and it affects early N55 engines too. The pump is a two part design: fuel goes into one half and lubricating oil into the other, and the sealing ring separating them ages over time. That is what drops the pressure.

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The very first symptom is a long crank: the engine does not catch straight away but turns over for several seconds. Later you get a rough idle, misfire, loss of power, and finally limp mode, which can reach you at the side of the road.

The fault code is typically P0087 or P0089. If the control unit also returns a camshaft timing code (P0011, P0012), that is often not a separate fault but a consequence of the pressure drop: it is worth ruling the pump out first.

The 2007 to 2009 cars are the worst; the maker revised the design after that.

The N53 (the lean burn six cylinder sold in Europe) got the same pump. Faults were reported on it. It is not known whether they are as frequent as on the N54, because the N53 was not sold in the USA and there is no official complaint data on it.

between 114,000 and 256,000 km

What to check

  • Cold start: the engine must catch straight away. Several seconds of cranking is the first sign
  • Restart it once or twice when warm too, and watch for the same thing
  • Load the engine on the test drive: jerking, loss of power and limp mode are suspect
2 more steps in the write-up

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

  • A fault on the list does not mean the car you are looking at has it.
  • A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
  • You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.
Details in the terms