German regulators KBA have placed a registration ban on the Porsche diesel SUV following a test on two models
27 July 2017

Germany's KBA (Kraftfahrtbundesamt) has placed a registration ban on the Porsche Cayenne Diesel due to the discovery of what it describes as suspect emission manipulation software.

The ban, confirmed by German transport minister Alexander Dobrindt on Thursday, comes after KBA testing revealed the two Porsche models are fitted with software that manipulates CO2 emissions by switching to a so-called warm up strategy mode when it detects they are undergoing testing on a rolling road – the process providing them with a lower CO2 rating than that achieved otherwise.

The Cayenne Diesel and Macan S Diesel both run an Audi-developed and produced turbocharged 3.0-litre V6 diesel engine – the same unit used by Audi in a raft of different models, including the A4, A6, A8, Q5 and Q7In the Cayenne Diesel, the Audi V6 diesel develops 262bhp and is claimed to return 6.6L/100km (42.8mpg) on the combined European consumption test cycle for average CO2 emissions of 173g/km.

As well as placing an immediate ban on the registration of the Cayenne Diesel, the KBA has also order a recall of up to 22,000 vehicles already sold in Germany.

The Cayenne registration ban comes after tensions between Porsche and Audi were strained following comments made by Porsche union boss, Uwe Hueck, on Monday.

In a pointed attack on Volkswagen sister company Audi, Porsche’s Hueck said: “We feel deceived by Audi. The supervisory board should fire the management."

Porsche released the following statement: "Porsche has detected irregularities in the engine control software during internal investigations and has actively pointed this out to the Kraftfahrtbundesamt (KBA), German Federal Motor Transport Authority. The irregularities are not related to the transmission control software. Corrections by means of a software update within the scope of a recall were agreed with the authority.

"Regardless of the recall, Porsche continues to carry out internal audits on its vehicles and derive optimizations from them. Furthermore, the company is still in close contact with the authorities, in particular the German Federal Motor Transport Authority, on all current matters."

Read more on the ongoing emissions scandal:

Unfixed Dieselgate-affected Volkswagens to be deregistered in Germany 

German car industry under EU cartel investigation

Our Verdict

Porsche Macan

Porsche's 'junior Cayenne' promises and delivers on its dynamic and performance prowess to be be the most sporting SUV of its size. However, the market has changed with the newrivals threatening to challenge the Macan's crown, so does it have the stomach for a fight?

Join the debate


27 July 2017

Are VW group going to play hide the 'defeat device' until every last car is tested? You really couldn't make it up.


27 July 2017

Disgusting. Treat your customers with contempt. VAG should be off the menu for anyone with a hint of self-respect. Obviously they'll continue to be held in high esteem by the car mags, but the diesels should be boycotted. 

28 July 2017
michael knight wrote:

Disgusting. Treat your customers with contempt. VAG should be off the menu for anyone with a hint of self-respect. Obviously they'll continue to be held in high esteem by the car mags, but the diesels should be boycotted. 

Is the corollary of this that anyone who does buy a VAG product has no self respect?


27 July 2017

Porsche should be testing the emissions performance of its vehicles before releasing them, not after. They deserve another big fine. Do these companies even know what homologation means?

27 July 2017
Perhaps a wake up call for the blind lovers and advocates of Euro6 diesels? The US has shown that the only way to make Volkswagen play fair is by banning the sale of their cars. I hope the blinkered May is watching. Also hope that Germany adopts a same policy for VW cars for the masses.

28 July 2017
fadyady wrote:

Perhaps a wake up call for the blind lovers and advocates of Euro6 diesels?

It's only VAG who have been found cheating here, or have I missed something?  Those Euro6 diesels which use AdBlue are meeting the requirements, I thought?  I'd agree that diesel in general is a poor choice for most cars, but it really has good applications, and it woiuld be a shame if this choice was removed due to the actions of one company.

28 July 2017
I agree that diesel is a viable choice for high milers and for larger cars but the matter of Euro6 is a bit trickier than that. Almost all car makers have been tuning their cars to pass the European emissions test. Volkswagen which includes other brands like Porsche Audi Skoda Seat etc took it to a new level which allowed them not only to get through the European test but the more stringent US tests too. In short the software senses that the car is undergoing testing. It turns on the emissions control systems including the ad-blue. Once the car comes off the test cycle the emissions control system are turned off allowing the car to perform freely at the cost of emissions that are 40 times higher than permitted. Euro 6 diesel beats the tests better than Euro 5 but real life driving is another matter. The German cars are all fitted with an ad blue tank that holds liquid that would clean the emissions for about 3000 miles yet the refill is timed upwards of 10000 miles indicating that some of the cheats which have not neen found out yet are still at work.

28 July 2017

Roll eyes....I thought the notion of untruths regarding this group had already been established.


28 July 2017

Meanwhile, the single daily movement of large jets at a single German airp[ort puts out for in the way of emmissions than all the cayenne diesels put together......




1 August 2017

Whilst deliberately cheating tests is obviously deplorable, there is a complete over-reaction to diesel cars. The emissions are sometimes quoted as being 40 times higherthan they should be, but 40 times a tiny amount is still a very small amount. Cars are under the microscope whilst cruise ships, container ships, airliners and many other highly polluting vehicle types seem to be totally ignored by politicians and the public alike.

Add your comment

Log in or register to post comments

Find an Autocar car review

Driven this week

  • Mercedes-Benz E-Class Estate
    First Drive
    19 March 2018
    The Mercedes-Benz E-Class could be all the estate car you’ll ever want — or it could be overkill. Let’s see which...
  • Dallara Stradale
    The Stradale is the first road-legel car from Italian motorsport constructor Dallara
    First Drive
    16 March 2018
    The motorsport constructor's first road car is inspired by Lotus minimalism. Does it thrill on road and track?
  • Hyundai i30 N
    Standard spec is good so paint colour is our car’s only option
    First Drive
    16 March 2018
    What’s Hyundai’s first hot hatch and N-brand debutant really like? Let’s find out
  • Porsche Boxster GTS
    This is the new GTS version of the Porsche Boxster
    First Drive
    15 March 2018
    The 718-generation Boxster is our favourite roadster of the moment – so is this new GTS variant worth the extra outlay?
  • BMW 5 Series
    First Drive
    15 March 2018
    The BMW 5 Series is top of the mid-exec pack, but is there still room for a diesel saloon in everyday family life?