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Buying guide

BMW M3 CSL E46 (2003 to 2004): buying guide, problems and NZ numbers

The BMW M3 CSL E46 was built from 2003 to 2004 as a coupe, with a manual or sequential gearbox, rear wheel drive and petrol power. Chassis code: E46. Redline has a curated guide to its 7 most reported weak points, from owner club and specialist sources.

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Key facts

Years
2003 to 2004
Chassis codes
E46
Body types
Coupe
Gearboxes
Manual, Sequential
Drive
RWD (rear wheel drive)
Fuel
Petrol

On NZ roads

Counting every one on the NZ register. The first look can take up to 15 seconds.

Known weak points

Curated by Redline from owner club and specialist sources Commonly reported by owners and specialists for the BMW M3 E46 (2000 to 2006). Not every car has these; check this one.

  1. Rear axle carrier cracking

    Cracking of the rear axle carrier panel is called the E46 M3 weak point. Reinforcement plates are fitted as a fix or to prevent it.

    Where to look
    The rear axle carrier panel where the rear subframe bolts to the floor, seen from underneath
    How to test
    Ask whether it has been checked or reinforced and by whom, and get a specialist to look on a hoist.
    Cost if it needs fixing
    High cost complex structural repair

    Sources: classicandsportscar.com (opens in a new tab), fastcar.co.uk (opens in a new tab)

  2. S54 rod bearings

    Rod bearing weakness should have been cured on an early recall, and specialists recommend replacing them preventatively.

    Where to look
    The bottom end of the S54, and the recall and service records
    How to test
    Ask whether the recall work and any later bearing change have been done, and listen for a knock once warm.
    Cost if it needs fixing
    High cost engine rebuild if a bearing fails

    Sources: classicandsportscar.com (opens in a new tab), fastcar.co.uk (opens in a new tab)

  3. VANOS

    A rattling VANOS or a lack of power means an overhaul is due.

    Where to look
    The VANOS unit at the front of the cylinder head
    How to test
    Listen for a rattle from the front of the engine and feel for flat spots. A diagnostic test confirms it.
    Cost if it needs fixing
    High cost VANOS overhaul

    Sources: classicandsportscar.com (opens in a new tab), fastcar.co.uk (opens in a new tab)

  4. Head gasket

    Head gasket failure is fairly common at 80,000 to 100,000 miles. A misfire, or pinking when accelerating gently uphill at 2000 rpm, are signs.

    Where to look
    The cylinder head, and the engine under light load
    How to test
    On the drive, accelerate gently uphill from 2000 rpm and listen for pinking.
    Cost if it needs fixing
    High cost about 1,500 pounds in the UK

    Sources: classicandsportscar.com (opens in a new tab)

  5. Lower wishbones and bushes

    The forged aluminium lower wishbones and their bushes and bearings lead a hard life.

    Where to look
    The front lower wishbones and bushes
    How to test
    Feel for vague steering and knocks over bumps.
    Cost if it needs fixing
    Medium cost wishbones and bushes

    Sources: classicandsportscar.com (opens in a new tab)

  6. SMG gearbox pump

    Slow gear changes or an apparent loss of 4th gear point to the SMG pump.

    Where to look
    The SMG pump and the gear changes
    How to test
    Try every gear in every mode and watch for warnings.
    Cost if it needs fixing
    High cost a rebuilt pump is close to 1,000 pounds exchange

    Sources: classicandsportscar.com (opens in a new tab), fastcar.co.uk (opens in a new tab)

  7. Rust and damp electrics

    Rust mainly shows on the arches. Damp causes electrical faults, especially on cars kept outside, and convertible hoods let water in.

    Where to look
    The wheel arches, the carpets, and every electrical function
    How to test
    Look at the arch lips, feel the carpets for damp and check everything electrical works.
    Cost if it needs fixing
    Medium cost arch repair and electrical diagnosis

    Sources: fastcar.co.uk (opens in a new tab), classicandsportscar.com (opens in a new tab)

General guidance from owner and specialist sources. Check the specific car with an independent inspection. Researched 3 November 2026.

What the cost bands mean
  • Low: a small job. Typically a few hundred dollars or less at an NZ workshop, often a DIY fix.
  • Medium: a proper workshop job. Typically several hundred to a couple of thousand dollars.
  • High: a major job. Typically several thousand dollars or more, enough to change what the car is worth.

Service items

Questions to ask the seller

  • Has the rear axle carrier been checked or reinforced?
  • Have the rod bearings been replaced, and was the recall done?
  • Is it manual or SMG?
  • Has it been tracked or modified?
  • Has the head gasket been done?

US recalls

Looking up US recall data.

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