Volkswagen Motorsport director Jost Capito says his team will undergo a thorough investigation to discover what is to blame for the team's frustrating Rally Argentina.

The three VW factory-supported World Rally Championship cars all suffered retirements during in the South American event and as a result the VW machines failed to finish in the top 15. The German manufacturer had enjoyed a run of 20 consecutive podiums in WRC until last weekend and Capito it determined to get to the bottom of the problem.

Initial suspicions point to a fault with the fuel supply parts, which stopped Sebastien Ogier on Friday morning and Jari-Matti Latvala on Sunday's penultimate El Condor test, when the Finnish driver was on course for a rostrum finish in his Polo R.

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"It happens and luckily all our problems came together in one rally, so maybe it's done for this year," Capito told "It's not related to the roughness of the rally, definitely not.

"We have to go back home and analyse the parts and see. The fact it happened twice helps us because we know it's not a one-off."

VW's motorsport director also confirmed it was a new problem which had never been seen before in testing or in competition. Early indications suggest the retirements were down to failures with a batch of fuel injection systems.

Rally Argentina marked the German manufacturer's worst performance since it entered the WRC two years ago. On top of Ogier's and Latvala's technical issues, Andreas Mikkelsen was forced to retire after crashing in the Power Stage on Sunday. The Norwegian driver had also been forced to stop on Friday with power steering problems.

However, Volkswagen didn't leave Argentina pointless as reigning WRC champion Ogier was able to save some of the team's embarrassment with victory on the Power Stage (SS12), to collect three bonus points.