NEW YORK ( TheStreet) -- Toyota ( TM) says Thursday that roughly 270,000 vehicles, including several Lexus models sold around the world, may have been affected by faulty engine problems.

Reports say that Toyota representatives, without providing any details about how the company discovered the engine problems, said earlier -- from the automaker's Japan offices -- that they aren't aware of any accidents in connection with this issue.

Although Toyota has not yet provided any details on how they plan on addressing this issue, the Japanese media suspects that there will be a recall of hundreds of thousands of vehicles -- including tens of thousands of Lexus LS 460s -- which would be another blow to automaker's tarnished image -- just as it starts to show some improvement -- following its massive recalls over sudden acceleration complaints.

Up to seven Lexus models could be affected by the engine problems: the Lexus GS 350, GS 450h, GS 460, IS 350, LS 460, LS 600h and LS 600h L. The Toyota Crown could also be affected.

Toyota has not yet notified U.S. safety regulators of any recall plans.

Shares of Toyota are up 0.3% to $68.77 shortly before the market close.

On Thursday, Toyota reported June sales of 140,604 units, up 6.8% over the year-ago month as its customer incentives remain aggressive, but falling 14% from May.

-- Reported by Andrea Tse in New York

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