Downey, CA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Ban zone
- Within 100 feet of residentially zoned property
- Covers
- Cars, trucks, RVs, off-road vehicles, mini-bikes, go-carts
- Adopted
- Ordinance 778, December 18, 1984
- Bright-line backup
- 100 dB at 25 feet is a violation (§ 4600.1)
- Penalty
- Up to $1,000 fine / 6 months (§ 1200(c))
Summary
Downey bans repairing, rebuilding, or test-running any motor vehicle's engine within 100 feet of residentially zoned property when the noise disturbs neighbors' peace, comfort, or welfare, under Municipal Code § 4600.3; a related section deems any noise over 100 decibels measured 25 feet from its source a prima facie violation of the City's general noise law.
It shall be unlawful for any person within any residential area of the City of within 100 feet of any residentially zoned property, to repair, rebuild, or test any motor vehicle or operate or run the engine thereof in any manner to produce sounds which would disturb or interfere with the peace, comfort, or welfare of the neighboring inhabitants. For purposes of this section, the term "motor vehicles" shall include, but not be limited to, automobiles, trucks, recreation vehicles, off-road vehicles, mini-bikes, and go-carts.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4807734; v5 updated 2026-01-27).
Full Breakdown
3 of the Downey Municipal Code makes it unlawful for anyone within a residential area, or within 100 feet of any residentially zoned property, to repair, rebuild, or test a motor vehicle, or to run its engine, in a manner that disturbs or interferes with the peace, comfort, or welfare of neighboring inhabitants. The section defines "motor vehicles" broadly to include automobiles, trucks, recreation vehicles, off-road vehicles, mini-bikes, and go-carts, so it reaches backyard mechanics and hobbyists working on dirt bikes as much as anyone doing brake or exhaust work on a family car.
It was added by Ordinance 778 in 1984 as a stand-alone follow-on to the City's general noise section, § 4600, which separately bars racing a vehicle's motor, needless sudden starts or stops, and off-highway operation that disturbs a neighborhood by noise, dust, smoke, or fumes. 1 supplies the objective backstop for both: any noise exceeding 100 decibels measured 25 feet or more from its source is deemed a prima facie violation of § 4600, giving code enforcement and police a bright-line reading they can point to without proving subjective annoyance. 1, whichever is easier to establish on the facts of the complaint.
Violations & Fines
Section 4600.3 carries no penalty of its own, so a violation is prosecuted under the citywide default in § 1200(c): a misdemeanor punishable by up to a $1,000 fine, up to six months in County or City jail, or both, with each day the noisy repair work continues charged as a separate offense. Officers may also cite the underlying nuisance provisions of § 4600.
Frequently Asked Questions
Can I work on my car's exhaust or engine in my driveway in Downey?
Does Downey have a decibel number for vehicle noise complaints?
What vehicles count under Downey's engine-noise repair ban?
Sources & Official References
Other rules in Downey
California rules heatmap·Compare Downey to another location·View the California noise ordinances overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Vehicle Noise in Nearby Cities
How other cities in Los Angeles County handle vehicle noise.