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BMW X3: N55 HPFP Cam Follower Wear & Fuel Pump Damage

N55 HPFP Cam Follower Wear & Fuel Pump Damage is a common engine fault on the BMW X3 on the 2011–2017 cars, and we rate it major. Putting it right costs $450 to $4,800 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 42 documented faults on the BMW X3.

Vehicle
BMW X3
Engine
N55
Years
2011–2017
Fuel
petrol
System
Engine

This page covers the BMW X3 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All BMW X3 faults42 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the High-pressure fuel pump yet. We would rather show none than show a picture of a different part.

What goes wrong

The N55 3.0T engine drives its high-pressure fuel pump via a dedicated lobe on the exhaust camshaft acting on a small bucket-style follower. This follower is made of relatively soft material and wears progressively, especially if oil change intervals are stretched. Worn followers allow the HPFP to operate with insufficient lift, causing high-pressure fuel delivery faults. If the follower is not replaced at BMW's recommended 20,000 km inspection interval the cam lobe itself is scored, requiring a cylinder-head strip. BMW updated the follower material and issued inspection guidance.

What you would notice

  • Rough idle and stumble under light acceleration
  • DME fault codes 2FBA or 2FBB (fuel rail pressure too low / HPFP performance)
  • Hard hot-start or extended cranking before engine fires
  • Audible ticking from the top of the engine under load

How to check it

Where to look. Top of N55 engine — HPFP mounted on exhaust camshaft at rear of cylinder head

Request service history confirming cam follower inspection every 20,000 km. During a pre-purchase inspection have the HPFP removed and measure follower wear depth — BMW specifies replacement beyond 1 mm of wear. Scan DME for current and historic fuel-pressure fault codes. If follower wear is significant, inspect the camshaft lobe for scoring before purchase.

Parts involved: High-pressure fuel pump.

What it costs to put right

$450 to $4,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the HPFP cam follower been inspected or replaced, and at what mileage?”
  • “Are there any fuel-system fault codes present or in history?”
  • “Has the car experienced rough running, misfires or hard starting?”

Now check the BMW X3 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

BMW X3 buyer questions

Is n55 hpfp cam follower wear & fuel pump damage serious on a BMW X3?

We rate it major and common on the BMW X3. The N55 3.0T engine drives its high-pressure fuel pump via a dedicated lobe on the exhaust camshaft acting on a small bucket-style follower. This follower is made of relatively soft material and wears progressively, especially if oil change intervals are stretched. Worn followers allow the HPFP to operate with insufficient lift, causing high-pressure fuel delivery faults. If the follower is not replaced at BMW's recommended 20,000 km inspection interval the cam lobe itself is scored, requiring a cylinder-head strip. BMW updated the follower material and issued inspection guidance.

How much does it cost to fix on a BMW X3?

$450 to $4,800 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which BMW X3 years are affected?

Our research records this fault on the 2011–2017 BMW X3. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Request service history confirming cam follower inspection every 20,000 km. During a pre-purchase inspection have the HPFP removed and measure follower wear depth — BMW specifies replacement beyond 1 mm of wear. Scan DME for current and historic fuel-pressure fault codes. If follower wear is significant, inspect the camshaft lobe for scoring before purchase. Look here: Top of N55 engine — HPFP mounted on exhaust camshaft at rear of cylinder head