BMW E46 320d buying guide: the classic diesel 3 Series

The E46 320d is one of the most popular diesel BMWs ever sold. Built from 1998 to 2005, it combines the timeless E46 design with an economical four-cylinder diesel engine and rear-wheel drive.

Today, it is an affordable car for daily driving, but most examples are now old and many have covered high mileages. In this buying guide we explain the M47 engine, gearboxes, the common issues and what to check before you buy an E46 320d.

Why the E46 320d is popular

The E46 320d offers a combination that still appeals today:

• Low fuel consumption for long distances.
• Good torque for easy overtaking.
• Rear-wheel drive and balanced handling.
• Timeless design, available as saloon, Touring, coupé and compact versions depending on engine and market.
• Affordable prices on the used market.

Many owners use the 320d as a reliable everyday car with the driving feel of a classic BMW. Our E46 330Ci buying guide explains the six-cylinder petrol version of the same generation.

The M47 engine

The E46 320d uses the M47, a 2.0-litre four-cylinder common-rail or earlier direct-injection diesel, depending on the year. Power increased during production, from around 136 hp in early cars to around 150 hp after an update, with a later version reaching around 163 hp in some markets.

The M47 is strong when maintained, but at this age several parts need attention. Later BMW four-cylinder diesels, such as the N47 and B47, replaced it. Our article on the BMW B47 diesel explains the modern engine.

E46 320d common issues

Points to check include:

• Swirl flaps: on some M47 versions, the flaps in the intake can wear and, in rare cases, break and damage the engine. Our article on BMW swirl flaps explains the risk and solutions.
• EGR valve and intake soot, which can cause poor running and smoke.
• Turbocharger wear: listen for whistling and look for smoke. Our article on BMW turbo problems explains the symptoms.
• Injectors on high-mileage engines.
• Dual-mass flywheel and clutch on manual cars. Our article on the BMW dual-mass flywheel explains the symptoms.
• Thermostat and cooling system parts.
• Glow plugs, which affect cold starts.

Most of these can be fixed, but they should be reflected in the price.

Gearboxes

The 320d was offered with five or six-speed manual gearboxes and an automatic gearbox. The manual is popular and suits the engine well. Check for smooth gear changes and listen for noises at idle that may point to the flywheel.

On automatic cars, check for smooth shifts and no delays. Fresh fluid can help an old automatic gearbox. Our article on BMW transmission fluid explains why.

Rust and body

The E46 is generally well protected, but cars are now old. Check:

• Wheel arches, especially at the rear.
• Sills and jacking points.
• The boot lid around the number plate lights.
• The rear subframe mounting area, a known topic on E46 models.
• Door bottoms.

Our article on BMW rust explains how to inspect an older BMW.

Suspension and interior

Worn front control arm bushings are common and cause vague steering and vibration. Our article on worn BMW suspension bushings explains the symptoms.

Inside, check the instrument cluster for missing pixels, the climate control, window regulators and seat wear. Most interior parts are still easy to find. Our article on BMW window regulators explains a common issue on older BMWs.

Running costs

The E46 320d is one of the cheapest BMWs to run. Fuel consumption is low, insurance is usually affordable and parts are widely available from BMW and independent suppliers.

The main costs come from age-related repairs rather than routine servicing. Budget for:

• Clutch and flywheel replacement on manual cars with high mileage.
• Suspension bushings and ball joints.
• Cooling system parts such as the thermostat and water pump.
• Swirl flap or intake work if it has not been done.
• Rust repairs on cars from wet or salted-road climates.

A car that has already had these jobs done can be worth paying more for. Our guide to BMW M car running costs explains how maintenance budgets work for older BMWs.

Test drive checklist

On the test drive:

• Start the engine cold and check for smoke and rough running.
• Check for smooth acceleration without hesitation or whistling.
• Listen for knocks from the suspension.
• Test the clutch for slipping.
• Read the fault memory if possible.
• Look at the service history for oil changes, swirl flap work and cooling system parts.

Our complete checklist for buying a used BMW and our guide to buying a high mileage BMW explain other checks.

Is the E46 320d a good buy?

A well-maintained E46 320d can be an economical and enjoyable car with classic BMW character. Look for cars with documented swirl flap and EGR work, a healthy clutch and minimal rust.

Because prices are low, it is tempting to buy the cheapest car, but a slightly more expensive example with good history usually saves money. Our article on BMW diesel or petrol helps you decide whether a diesel suits your driving.

BMW E46 320d key facts

Item	Details
Production	1998 to 2005
Body styles	Saloon, Touring, coupé and compact, depending on market
Engine	M47 2.0-litre four-cylinder diesel
Power	Around 136–163 hp depending on version
Gearboxes	Manual or automatic
Drive	Rear-wheel drive
Key checks	Swirl flaps, EGR, turbo, flywheel, rust

Frequently asked questions

Is the E46 320d reliable?

It can be, with good maintenance. Swirl flaps, EGR, turbo and flywheel are the main points to check.

Does the E46 320d have swirl flaps?

Many versions do. Ask a specialist to confirm and check their condition.

Is the E46 320d economical?

Yes. It offers good fuel economy, especially on longer journeys.

Is an E46 320d a good first car?

It can be, if you choose a well-maintained example and budget for age-related repairs.

Sources

• BMW Group Classic – BMW 3 Series (E46)
• BMW Group PressClub – E46 press material