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CriticalCommonEngine

BMW 5 Series: N20 timing chain guide failure (520i / 528i)

N20 timing chain guide failure (520i / 528i) is a common engine fault on the BMW 5 Series on the 2010–2017 cars, and we rate it critical. Putting it right costs ≈A$2,300 to ≈A$4,600 at independent workshop rates, shown as an approximate guide in Australian dollars. 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 62 documented faults on the BMW 5 Series.

Vehicle
BMW 5 Series
Engine
N20
Years
2010–2017
Fuel
petrol
System
Engine

This page covers the BMW 5 Series 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 5 Series faults62 documented faults on this model

What you are looking at

The front of a dual overhead camshaft engine with the timing cover removed, exposing the timing chain and sprockets.Example of the part — not this vehicle

The front of a twin-cam engine with the timing cover off — chain, sprockets and guides.

Logansenf · CC BY-SA 4.0 · Wikimedia Commons

What goes wrong

F10 520i/528i cars use the N20 four-cylinder turbo, whose plastic timing chain guides (on engines built before ~2015) go brittle and break, letting the chain wear and eventually skip - which bends valves and can destroy the engine. A tell-tale whine or rattle from the front precedes failure. BMW extended warranties overseas, but those have expired. This is the defining check on an F10 four-cylinder petrol.

What you would notice

  • Whining or whirring from the front of the engine
  • Rattle on cold start
  • Timing/camshaft correlation fault codes
  • Rough running or sudden failure

How to check it

Where to look. Timing chain and guides at the front of the engine

On a cold start listen for a rattle and, on the drive, a whine from the timing end. Ask whether the timing chain and guides have been replaced (a proven chain job is a big plus) and note the engine build date. Any correlation fault code is a serious warning.

Parts involved: Timing chain.

What it costs to put right

≈A$2,300 to ≈A$4,600 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, 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 N20 timing chain and guides been replaced?”
  • “Is there any whine or rattle from the engine?”

Now check the BMW 5 Series 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 still has money owing on it, has been written off or reported stolen, what kms it showed in past sale ads, whether it has had accident repair claims and what it is worth today. That comes from the official records for that plate. Enter the plate and its state for the A$17.90 Vehicle Check, or the full history from A$24.99.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

  • Noorhan / Motronix N20 timing chain guides
  • BimmerFest 'N20 Timing Chain Failure 528i' megathread
  • Stedmans Garage BMW timing chain issues

BMW 5 Series buyer questions

Is n20 timing chain guide failure (520i / 528i) serious on a BMW 5 Series?

We rate it critical and common on the BMW 5 Series. F10 520i/528i cars use the N20 four-cylinder turbo, whose plastic timing chain guides (on engines built before ~2015) go brittle and break, letting the chain wear and eventually skip - which bends valves and can destroy the engine. A tell-tale whine or rattle from the front precedes failure. BMW extended warranties overseas, but those have expired. This is the defining check on an F10 four-cylinder petrol.

How much does it cost to fix on a BMW 5 Series?

≈A$2,300 to ≈A$4,600 at independent workshop rates, shown as an approximate guide in Australian dollars. 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 5 Series years are affected?

Our research records this fault on the 2010–2017 BMW 5 Series. 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?

On a cold start listen for a rattle and, on the drive, a whine from the timing end. Ask whether the timing chain and guides have been replaced (a proven chain job is a big plus) and note the engine build date. Any correlation fault code is a serious warning. Look here: Timing chain and guides at the front of the engine