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

Best Porsches – from Boxster GTS to Carrera GT and everything in between
Best Porsches
Best cars

Best Porsches – from Boxster GTS to Carrera GT and everything in between

Not all the best Porsches are 911s and not all the best 911s are GT3s. Here’s a list of the best cars to come from Stuttgart and Weissach in the moder…
31 Oct 2025
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
Kamm’s latest Porsche 912 restomod has less power than a basic BMW 3-series, but we don’t mind
Kamm 912T – front
News

Kamm’s latest Porsche 912 restomod has less power than a basic BMW 3-series, but we don’t mind

Kamm Manufaktur has unveiled a new Porsche 912-based restomod, and it could be the perfect antidote to the modern power race
7 Aug 2025
Skip advert
Advertisement

Most Popular

Best used cars – the pre-owned fast car favourites to buy in 2026
Best used performance cars
Best cars

Best used cars – the pre-owned fast car favourites to buy in 2026

Want a used performance car that’s fun to drive and affordable? Whatever your budget, we’ve got some suggestions for you
12 Jan 2026
Land Rover Defender Octa review – the super SUV that’s more fun than sports cars
Land Rover Defender Octa – front
In-depth reviews

Land Rover Defender Octa review – the super SUV that’s more fun than sports cars

Put aside your SUV cynicism. The Land Rover Defender Octa is a triumph, with 911 GT3 levels of engineering making it an unexpected thrill to drive
8 Jan 2026
Toyota GR Yaris Morizo RR is the 911 GT3 RS of hot hatchbacks
Toyota GR Yaris Morizo RR
News

Toyota GR Yaris Morizo RR is the 911 GT3 RS of hot hatchbacks

Limited run GR Yaris Morizo RR was inspired by its Nürburging 24 hour performance and championed by the company boss.
9 Jan 2026