All About the Toyota Hydrogen Engine Protector

This bulletin applies to 2016-2020 Toyota Mirai vehicles equipped with hydrogen engines. During vehicle inspections, when the under covers are removed, debris may be found on the under cover near the end of the hydrogen tank. Upon closer inspection, the debris is found to be coming from the end protector of the tank. 


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Aug. 4, 2022
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This bulletin applies to 2016-2020 Toyota Mirai vehicles equipped with hydrogen engines. During vehicle inspections, when the under covers are removed, debris may be found on the under cover near the end of the hydrogen tank. Upon closer inspection, the debris is found to be coming from the end protector of the tank.

During vehicle use, heat and ultraviolet light can cause degradation of the tank protector causing the foam to come off.

This protector is added to shield the tank during the production process and does not negatively affect the tank and is only an appearance concern. It is recommended to clean the under covers before reinstalling.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

Mike Mavrigian
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Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of  specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.

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