A Texas plumber has filed a lawsuit against a car dealership after a used truck he sold showed up on the front lines in Syria being used by Islamist fighters. The logo and phone number of his company, Mark-1 Plumbing, were still visible on the doors.

After images of the truck appeared online, the plumber, Mark Oberholtzer of Galveston County, claims he lost business and received hundreds of threats that accused him of being a terrorist sympathizer. Mr. Oberholtzer is seeking more than $1 million in damages, in a lawsuit filed last week, according to his lawyer, Craig Eiland. A copy of the lawsuit was provided to The New York Times.

Mr. Oberholtzer’s truck began its strange journey from fixing leaky pipes in suburban Texas to the Syrian battlefield in 2013.

In October of that year, the lawsuit said, Mr. Oberholtzer handed over the 2005 Ford F-250 truck to AutoNation Ford Gulf Freeway in Houston as part of a trade-in deal for a newer model.