Skip advert
Advertisement

Porsche 911 petrol engines subject of internal emissions cheat device investigation

Porsche has begun an internal investigation into possible emissions defeat devices fitted to petrol engines in the 911 and Panamera.

Porsche has opened up an internal investigation into alleged illegal software used in Porsche 911 and Panamera models built between 2008 and 2013. The investigation was proactively reported to Germany’s Federal Motor Transport Authority (KBA) by Porsche themselves and is ongoing. 

The illicit software is alleged to illegally switch exhaust filters depending on the internal engine modes, similar in execution to the devices found in diesel engines supplied to Porsche by Audi. If proven, this adds to the long list of illegal conduct that has been making headlines since the VW emissions scandal first blew up in September of 2016. 

Advertisement - Article continues below

Since then, numerous criminal investigations into emission cheat devices have been undertaken by authorities across the world, but this is one of only a few found in a petrol engine, not to mention one that’s being proactively investigated internally rather than covered up. In addition to Porsche’s internal investigation, the KBA has also started its own investigation into Porsche’s claim of internal misconduct. 

Porsche UK responded to the investigation stating: “Porsche is routinely and continuously reviewing technical and regulatory aspects of its vehicles. The company also conducts reviews of potential issues. This is an expression of a functioning system of internal control measures and our corporate culture. 

In such reviews, Porsche has identified topics that it has now – as in other instances – pro-actively brought to the attention of the regulators. These topics mainly relate to specific hardware and software used in certification testing. In certain cases such components may also have differed from parts used in series vehicles. 

Based on our current investigative results, these topics only relate to vehicles that were developed years ago. There is no evidence that vehicles from current production are affected.

Porsche is continuing its review and is coordinating closely with authorities.”

Skip advert
Advertisement

Recommended

Porsche tuner Ruf is back with a surprise 1000bhp B8 engine, and that’s not a typo
RUF boxer-eight
News

Porsche tuner Ruf is back with a surprise 1000bhp B8 engine, and that’s not a typo

Long-standing German Porsche tuner and manufacturer Ruf has announced a new boxer eight-cylinder engine, and it’s already up and running
9 Jul 2026
Best Porsches – from Boxster to Carrera GT, there's a Porsche for everyone
Best Porsches
Best cars

Best Porsches – from Boxster to Carrera GT, there's a Porsche for everyone

Not all the best Porsches are 911s and not all the best 911s are GT3s, though as you’re no doubt expecting, there are plenty of both peppering this li…
30 Apr 2026
Ex-Porsche man returns home after stint at Ferrari and McLaren
Michael Leiters
News

Ex-Porsche man returns home after stint at Ferrari and McLaren

Michael Leiters, the ex-McLaren CEO named as new boss of Porsche
17 Oct 2025
Porsche officially puts EV plans on hold, developing new petrol models instead
Porsche 911 GT3 RS – front
News

Porsche officially puts EV plans on hold, developing new petrol models instead

It’s official. Porsche has delayed incoming EV models in response to poor demand, extending the lifespan of combustion-powered models in the process
22 Sep 2025
Skip advert
Advertisement

Most Popular

VW Golf GTI Edition 50 v Toyota GR Yaris Aero v Honda Civic Type R: hot hatch stars go head-to-head
Golf GTI v GR Yaris Aero v Civic Type R
Group tests

VW Golf GTI Edition 50 v Toyota GR Yaris Aero v Honda Civic Type R: hot hatch stars go head-to-head

Volkswagen and Toyota have just released the best versions yet of the GR Yaris and Mk8 Golf GTI. Does either have what it takes to overcome the brilli…
2 Aug 2026
A week in a Porsche 911 GT3: why the world’s best sports car isn’t quite perfect
Porsche 911 GT3 Touring
Long term tests

A week in a Porsche 911 GT3: why the world’s best sports car isn’t quite perfect

A week in the Porsche 911 GT3 reveals why even the world’s best sports car can’t get it all right
3 Aug 2026
I put budget tyres to the test in the wet, and the results were terrifying
Cheap tyres
Opinion

I put budget tyres to the test in the wet, and the results were terrifying

Skimping on tyres may save you a few pounds, but at what cost, ponders Barker
30 Jul 2026