You cant install any extra lamp or illuminating device on or in your car(neon, strobes, LED's, those led windshield spray nozzels. You can change the bulbs in any factory installed light(doors, map lights ect.) other than that having colored lighting will get you a V.C. 24003 violation & if you get lippy with the cop he can get you on a V.C. 24012, The headlamps and every light source in any headlamp unit shall be located at a height of not more than 54 inches nor less than 22 inches. You cant install HID lights to your car unless it was a "factory option" It is illegal in CA, this is also under the 24003 V.C. apparently...
Driving with just your parking lights on EVEN in the daytime will get you one from V.C. 24800
Any flashing light anywhere on your car will get you V.C. 25250, this one is one you cant fight, Even your alarm light flashing while you are diving the car will get you pulled over.
Got Bass? well if it can be heard from 50 feet away it will cost you 106.00 and get you V.C.27007
V.C. 27151, Loud exhaust? over 95 db
Got a indash dvd screen? No video screen forward of the rear of the drivers seat will have anything playing ot it while the car in operation(this does not apply to onscreen NAV) V.C.27602 AND the shop that installed the video screen that does not use the E-brake wire can be held liable for that and if a accident occures the shop may be to blame as well.
If you install driving lights on the front of you car it must be more than 16" from the ground, heres more BULLSH*T you cant drive with them on unless your high beams are on. Driving with your lows on and your driving lights on will get you another Violation of V.C. 24002.
You Cant lower your car/alter suspension(bags) other than factory options. V.C. 24008 Now this states nothing can hang below the bottom of your rim. There is also a head light minimum and maximum measurments that will also get you this ticket. I have had both too high and to low.
Aftermarket bumpers will get you a violation of V.C. 24011.3 as most of them dont have the required Title 49 of the Code of Federal Regulations of a 2.5 mile impact rating.
For those of us that relocate your rear plate, make sure you got a light on it and its bright enough to see your plate from 50 feet, Were ever it is installed, AND it must be connected to the switch that turns your headlights on and off. V.C. 24601
Side markers, This was interesting. You can have side markers on your fenders with a white or amber light BUT the light assembly must be recessed into the fender as not to be seen from the front or the rear. I think it states that it can only have 2 canel power as well. But again if it is not inset in to your fender you will get V.C. 25102