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December 13, 2025 Emissions

Certain vehicle model year 2022 Kenworth chassis equipped with Engine Model Year (EMY) 2021 PACCAR MX...

Peterbilt technical service bulletin E334 for 2022 Peterbilt 579, 2022 Peterbilt 389 and 2022 Kenworth T880 and others.

Bulletin number
E334 (E334)
Component
Engine
Summary
Certain vehicle model year 2022 Kenworth chassis equipped with Engine Model Year (EMY) 2021 PACCAR MX engines may have an exempt engine label installed.

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