On Thursday, Ford Motor Co. announced that it has hired outside experts to look into vehicle fuel economy and testing procedures after its employees raised a few concerns.

Speaking to Reuters regarding the investigation, Ford’s President for sustainability, environment and safety engineering, Kimberly Pittel stated confirmed that the issued involving the company’s testing process did not involve the use of defeat-devices that are designed deliberately to deceive government emission tests.

The investigation has been started with the Ranger pickup trucks.

Since last year, the carmaker has been consistently eyeing concerns raised by employees regarding incorrect calculations that were used to translate the test results into the mileage and emission data submitted to the authorities.

A few hours after the disclosure, Ford witnessed a slight dip in its shares. To carry out an independent investigation into any possible discrepancies in calculations used to produce emissions and fuel economy, the company has hired law firm Sidley Austin.

Following Ford’s announcement, the EPA said in a statement that information from Ford was “too incomplete for EPA to reach any conclusions. We take the potential issues seriously and are following up with the company to fully understand the circumstances behind this disclosure.”

The results for the test will be obtained by the company next week.

The investigation has been kicked off with testing of the 2019 Ranger pickup truck, the data for which will be obtained by next week, Ford said.

“We cannot predict the outcome, and cannot provide assurance that it will not have a material adverse effect on us,” Ford told investors in a regulatory filing Thursday. “We are going to go where the investigation takes us,” Pittel said.

This, however, is not the first time Ford has been under the radar for emission figure discrepancies. In 2013, the carmaker had cut the claimed fuel economy by about 3kpl for its C-Max hybrid model.