The National Highway Traffic Safety Administration says it has received reports of problems from five owners of Pathfinders. No injuries have been reported. The probe covers an estimated 110,000 cars.
The NHTSA has begun an evaluation to assess the size and safety-related consequences of the issue. Such probes can often lead to recalls.
Nissan said it has received a request for information from the NHTSA stemming from the reports of leaks. Spokesman Steve Yaeger said the company is working with the agency to address questions.
In addition, he said a repair procedure has already been developed for use by authorized Nissan and Infiniti dealers for vehicles that have the problem.
The Nissan Pathfinder and the Infiniti JX are both sport utility vehicles.
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