Oakley enforces California Vehicle Code Section 27150 requiring adequate, unmodified mufflers on all vehicles, along with OMC Chapter 8.20 prohibitions on excessive vehicle noise. Modified exhausts, engine revving, and audio systems audible 50+ feet away from the vehicle are all subject to citation.
Vehicle noise in Oakley is governed by a combination of the California Vehicle Code and Oakley Municipal Code Chapter 8.20. CVC Section 27150 requires every motor vehicle to be equipped with an adequate muffler in constant operation and prohibits modifications that amplify or increase exhaust noise. CVC Section 27151 bars any alterations that cause the vehicle to exceed 95 dBA under a SAE J1169 measurement. Oakley police enforce these against modified exhaust systems, straight pipes, and deleted catalytic converters — increasingly common issues on modified trucks along Main Street and Highway 4 corridor. Vehicle audio systems (car stereos) that can be heard 50 feet or more from the vehicle violate CVC 27007 and are commonly cited along Oakley's Delta waterfront cruise routes. Engine revving, prolonged idling, and "burnouts" or "sideshows" are separately prohibited under both state and local law and may result in vehicle impoundment under recent California sideshow enforcement statutes. Fines for a first muffler violation typically run $100–$200 plus a required "fix-it" correction showing compliance before the citation is signed off. Motorcycle noise complaints are frequent given Oakley's popularity with Delta-area riders.
Contact your local code enforcement office for specific penalty information.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Oakley, CA
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