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Mercedes-Benz SLK-Class R171 common faults.

2004–2011. The fault list covers this generation and the engines in it. If the listing gives the exact version, pick it below.

Mercedes-Benz SLK-Class R171

M 93 / CC BY-SA 3.0

What to watch for

What can go wrong on this car?

The list covers the generation, the engines and the transmissions. Once you pick the version, only the faults that apply to it stay.

critical5

M272 V6: early wear of the balance shaft gear

critical

On the M272 V6 petrol engines sold between 2004 and 2007 (with engine numbers below 2729..30 468993) the balance shaft gear wears out early.

Applies to the engine M272E30, M272E35.

expensive3

7G-Tronic (722.9): mechatronics and conductor plate

expensive

In the Mercedes 7 speed 722.9 automatic (7G-Tronic / 7G-Tronic Plus) the mechatronics unit and the conductor plate (Leiterplatte) age over time: jerking on shifts, delayed engagement, a "Getriebe schützen" message, and fault codes on the gearbox electronics.

Applies to the transmission MB7229.

3 more faults belong to this generation. On the version page, only the ones that apply stay.

Official recall2 recallsShow

The manufacturer fixes these for free at a franchised dealer. Ask with the VIN whether it was done. The list covers the whole generation. We did not filter it by model year. Some apply only to a narrower production window.

A12/01236/20Safety recallInjuriesno date · EU Safety Gate

The driver and passenger airbags of the company Takata in vehicles with ammonium nitrate gas generators without drying agents could, under certain climate conditions, lead over time to a chemical change in the fuel. In the event of an accident triggering the release of the driver or passenger airbag, this change could cause the gas generators to burst. If a gas generator ruptures, the airbag would then have no restraining function and loose parts from the gas generator could reach the vehicle interior. This would increase the risk of injury for passengers.

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: Unknown

The authority's notice

A12/01448/22Safety recallEnvironment, Injuriesno date · EU Safety Gate

Faulty configurations of the control units (traction systems, signal recording triggering modules, engine control units and headlights) could cause one or more control units to malfunction, which could increase the risk of an accident. The exhaust emissions exceed the legal limits, posing a risk to the environment. 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: Unknown

The authority's notice

Engines and transmissions in this generation

A fault is often tied to the engine, not to the whole generation. You find the engine code in the registration document.

R171 · 2004–2011

Pick the version.

The fault list opens on the version page.

37 versions

Neighbouring generations

R171 · 2004–2011

R171 (2004-2011). If the listing is from the changeover year, look at the neighbour too.

Previous generation

R170 · 1996–2004

This generation

R171 · 2004–2011

Next generation

R172 · 2011–2016

Common questions

About this generation

Which years does this page cover?

2004–2011. The changeover year can fall in two generations. If the listing is from that year, look at the neighbour too.

Does the fault apply to every car like this?

No. It depends on the engine and the transmission too.

Is it free?

The fault list is.

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

  • A fault on the list does not mean the car you are looking at has it.
  • A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
  • You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.
Details in the terms