BMW 3 Series 318i Touring Dynamic Executive common faults.

2005–2008, estate, petrol, 129 HP.

The fault list covers: N46B20 engine, ZF6HP-BMW transmission.

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5 fault write-ups. All are important. 12 recalls.

If you know the year, pick it. Faults for other years drop out of the list.

Before you buy

Known faults

5 important faults

critical2

Electric water pump: silent failure, immediate overheating

critical

In these engines the water pump is not belt driven but has its own electric motor. It gains on fuel consumption, but it opens a new failure path: the pump or its electronics often simply stops with no warning. Measured in the official complaints, the typical mileage is 161,000 km (a tenth of the complaints already at 81,000, a tenth only above 257,000 km). So the common wisdom of "around 100,000 km" is early: most of the failures happen between 130,000 and 250,000 km.

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With a belt driven pump the flow weakens gradually, here the circulation stops in an instant. In urban traffic the temperature crosses the limit within minutes, the cylinder head distorts, and the repair is an engine rebuild.

Replacing a still good pump at around 120,000 to 150,000 km costs less than repairing an overheated engine. If the replacement is already in the service book, the pump has already been changed.

between 81,000 and 257,000 km

What to check

Watch the coolant temperature gauge after startup: it should settle evenly, not jump around
Standing still with a warm engine, listen for whether the cooling fan and the pump are working
Ask for a fault code read: codes pointing at coolant flow belong here

2 more steps in the write-up

Blower motor connector corrosion: short circuit and fire, even on a parked car

critical

The contacts between the wiring harness and the blower motor regulator wear against each other and corrode. The connection becomes unreliable, the connector heats up, the insulation of the harness is damaged, and that can lead to a short circuit and finally a vehicle fire.

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The short circuit and the fire can happen while the engine is switched off, and also while the car is parked. A car standing in a garage can catch fire too.

According to the German technical press, in January 2021 around 430,000 cars in Germany and more than half a million worldwide were recalled for this, all E90/E91/E92/E93 3 Series. In the USA more than 700,000 2006 to 2011 3 Series cars had already been recalled for the same thing in autumn 2017, after claimants in three separate cases cited injuries. The maker disputed that the fault had ever caused personal injury or an accident.

The EU Safety Gate names it in two separate alerts: the 3 Series (A12/00390/21) and the X5/X6 (A12/01261/21).

The campaign is free, but only if it was carried out. On a fifteen year old car, ask about it, because nobody will offer it unprompted.

What to check

Ask the franchised dealer by VIN whether the blower motor connector campaign was carried out
Switch the blower on through every speed: a blower that hesitates or drops out at one speed can point to the connector fault
Smell the cabin with the blower running: burnt plastic or insulation is an immediate warning

2 more steps in the write-up

expensive3

VANOS solenoid valve: a clogging filter screen and late camshaft adjustment

expensive

VANOS adjusts the position of the camshaft with the pressure of the engine oil, and a solenoid valve metres that pressure. The valve sits in the oil circuit, and a fine filter screen protects the spool inside it from larger particles. That screen clogs with carbon and deposits: less oil flows through, and VANOS then adjusts late or does not move at all. The symptoms are a rough idle, rough running, a lack of torque at low revs and higher fuel consumption, because the valve timing is off. A short metallic clacking can also come on a cold start and goes quiet after 10 to 20 seconds. The engine warning light comes on with a camshaft fault code, and depending on the severity the engine control unit switches to limp mode. The fault code narrows down the cause. P0010 and P0013 typically mean the solenoid valve itself, that is a circuit fault or reduced oil flow through the clogged screen. P0011 and P0014 point more to a mechanical cause: a stretched timing chain or a worn adjuster. P0012 and P0015 report late camshaft control, whose common cause is slow pressure build-up at the adjuster, so again the dirty valve. The valve itself is a small part, between 50 and 120 euro, and with a clean screen cleaning is often enough; replacing the whole adjuster, by contrast, is a four-figure job. The reported repairs ran between 80 and 1,200 euro, depending on whether cleaning is enough and how many valves are affected. The main cause of the screen clogging is a stretched oil change interval and carbon-laden oil.

between 70,000 and 120,000 km80–1,200 EUR

What to check

Read the fault memory and note the exact code: P0010 and P0013 point to the valve
If P0011 or P0014 is stored, the timing chain has to be checked as well
Start the engine cold and listen for metallic clacking in the first 10 to 20 seconds

2 more steps in the write-up

Crankcase ventilation (CCV) in the valve cover: oil consumption, rough running

expensive

The crankcase ventilation leads the gas that forms in the crankcase back to the intake and separates the oil out of it on the way. If the system clogs or the membrane tears, the pressure cannot get away: it finds a way out past the seals, or it pushes the oil through the piston rings. This is where the oil consumption comes from, and the oil that appears around the valve cover gasket. In the other direction a faulty breather takes unmetered air into the intake, and that is what makes the idle rough, the throttle response hesitant and the running coarse. Starting also gets harder, and in an extreme case the engine stalls at idle. Two characteristic signs help: weak or absent suction at the oil filler with the engine running, and noticeably rough running around 3,000 rpm. The hose at the rear of the valve cover can also let oil out. The sound insulation then soaks itself with oil, and oil gets everywhere in the engine bay. On the six-cylinder engines the breather is built into the valve cover, so the repair is replacing the cover or the whole oil separator together with the hoses, between 80 and 900 euro.

between 80,000 and 150,000 km80–900 EUR

What to check

With the engine running unscrew the oil filler cap: weak or absent suction is a sign
Look around the valve cover and at the rear of the engine bay for oil traces
Watch the idle, and the rough running around 3,000 rpm

2 more steps in the write-up

ZF 6HP automatic: mechatronics connector sealing sleeve leaks

expensive

In the ZF six speed automatic (BMW codes GA6HP19Z / GA6HP26Z) the electrical connector of the valve body control leaves the gearbox housing through a plastic sleeve. That sleeve and its seals age, and they let oil through.

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The symptom is irregular shifting, a gear slipping at higher revs, limp mode, a drivetrain fault code and a message on the display. The cause is the same in each case: the leak drops the hydraulic pressure, and the valve body cannot close the clutches with enough force.

The sleeve can be replaced without removing the gearbox, you only have to drop the oil pan. If it leaks for a long time, the slipping clutch and the overheating pump take the inside of the gearbox with them, and from then on it is a rebuild. The factory calls the oil a lifetime fill, but in practice the sleeve wears out around 60,000 to 70,000 miles, roughly 100,000 to 115,000 km.

between 100,000 and 200,000 km

What to check

On a lift look at the right side of the gearbox housing, above the oil pan: a wet, oily connector is the characteristic picture
On the test drive watch the shifts cold and warm: jerking, delay, slipping at higher revs
Ask for a fault code read from the gearbox controller: gear ratio fault, pressure regulation

2 more steps in the write-up

Official recall12 recallsShow

The manufacturer fixes these for free at a franchised dealer. Ask with the VIN whether it was done.

Most recent: 19 March 2025

SR/01940/26Safety recallInjuries19 March 2025 · EU Safety Gate

The propellant in the driver airbag may deteriorate over time. If the airbags deploy, it could result in fragments from the inflator injuring the vehicle's occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: 19/03/2025

We could not check this: model year. The authority's notice

A12/01882/23Safety recallInjuries23 May 2022 · EU Safety Gate

The propellant in the passenger airbag can deteriorate due to high humidity and temperature variations. In the event of an accident in which the airbag deploys, this could result in fragments from the inflator casing coming loose and injuring the vehicle’s occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: 23/05/2022

We could not check this: model year. The authority's notice

A12/01929/23Safety recallInjuries29 June 2021 · EU Safety Gate

The propellant in the driver airbag can deteriorate due to high humidity and temperature variations. In the event of an accident in which the airbag deploys, this could result in fragments from the inflator casing coming loose and injuring the vehicle’s occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: 29/06/2021

We could not check this: model year. The authority's notice

A12/00039/20Safety recallInjuriesno date · EU Safety Gate

The connector of the positive battery cable on the front power distribution box may be damaged over the lifetime of the vehicle by vibrations and currents. This may lead to failure of the engine and of the vehicle's electrical system, including headlights and occupant protection which will increase the risk of an accident and injuries to the occupants.