Shares of Volkswagen tumbled on Wednesday, after the German auto giant’s woes continued to deepen after stating there were “irregularities” in the reporting of its C02 and fuel efficiency performance, extending the scandal to some of its petrol engine cars too.

The admission by the company late on Tuesday, sent shares tumbling over four per cent in Frankfurt. The problems with its C02 certification were uncovered by an internal investigation that has estimated around 800,000 cars will be impacted, some of which are expected to be 1.4 litre petrol engine vehicles.

“It appears, with the global investigation ongoing, investors should be prepared for further such ad-hoc announcements,” said analysts at Morgan Stanley.

The revelations are separate to the company’s initial problem regarding the installation of defeat devices in some 11 million diesel vehicles globally.

They are also separate to the latest violation notice from the US Environment Protection Agency regarding some 10,000 3.0 litre diesel engine cars from 2014-2016 (including Porsche and Audi), which it says used defeat devices. Unlike with the first set of charges, which related to vehicles between 2009 and 2015, Volkswagen has strenuously denied this second set of EPA charges.

The latest C02 revelations stand out from those in a number of other respects: unlike with the defeat devices, which the company can fix through a mixture of technical interventions and software changes during recall, the problems with C02 certification aren’t readily fixable, so compensation is likely to focus on redressing the higher taxes that customers are likely to face as a result of the vehicles classification (given the role that emissions, and efficiency play in tax bands).

The company has also insisted that the problems are not the result of defeat devices but of failures by its technicians during the certification and testing process.

The latest revelations will refocus attention on the mounting costs for the company — it has already set aside €6.7 billion in the third quarter, which is widely seen as just a part of the regulatory, penalty, recall and civil liability costs likely to be born by the company. Estimates of the total cost for the company range from around €15 billion to just under €50 billion.

It’s impact is also expected to be felt across the industry. “VW’s latest admission on CO2 will have ramifications across the sector,” wrote analysts at BNP Paribas in a note to clients, arguing that it would lead to greater compliance costs, amid a shift to real world test cycles, which are increasingly being pushed globally in the wake of the diesel engine scandal.

Our Delhi bureau adds: Volkswagen Group India has said that its representatives had met the Ministry of Heavy Industries and the testing agency ARAI on October 29. “It was agreed with the Government of India that Volkswagen Group India will present its results from the evaluation regarding the diesel engine emissions topic by the end of November 2015. The next steps would depend on findings from these evaluations," it said in a statement.

The company also confirmed that it has received a notice from ARAI and will respond to the same by November 30. It said that it will continue to fully co-operate with the government in this matter.

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