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Key Fob Relay Auto Theft Lawyer in Los Angeles
By William Kroger / Last Updated July 16, 2026
Auto Theft By Remote Control
A key fob relay theft arrest often starts with an electronic device police believe could unlock, start, or access a vehicle. That may include a signal extender, a key programmer, a key-duplicating device, or a similar tool. But the case should not stop at what the device can do. Prosecutors still have to prove why the person had it.
These cases often involve assumptions about unfamiliar technology. A device may have a lawful use, may not work, may not belong to the accused person, or may have no connection to any attempted vehicle break-in. The defense should examine the device, the search, the surrounding facts, and whether the prosecution can prove criminal intent.
William S. Kroger, Attorney at Law, defends people accused of auto theft, burglary, and vehicle-related crimes in Los Angeles. If you were arrested for possession of burglary tools, key fob relay theft, or signal extender allegations, speak with an attorney before answering police questions.
How California Law Views Signal Extenders and Key Programming Devices
California’s burglary tools law already covered many traditional tools, including picklocks, crowbars, screwdrivers, slim jims, bump keys, and lock pick guns. The law has now been updated for newer vehicle-theft allegations involving electronic devices.
Assembly Bill 486 added key programming devices, key duplicating devices, and signal extenders to California’s burglary tools law. A signal extender includes a device that extends the range of a keyless car fob signal, allowing the vehicle to receive commands to lock, unlock, open, start, or connect with the vehicle’s onboard computer. A key programming or duplicating device may include equipment that can access a vehicle’s onboard computer, add or delete keys, remotely start a vehicle, or capture a key code or signal.
This update gives prosecutors another way to file charges tied to modern vehicle theft allegations. But the law still requires proof of intent. A person is not guilty just because police found a device that looks suspicious or could be misused.
A person may have automotive electronic equipment for lawful reasons, including locksmith work, vehicle repair, dealership work, repossession-related work, security testing, or programming a vehicle they own. The defense should examine why the person had the device, whether it worked, whether it was connected to a specific vehicle, and whether police assumed criminal intent without enough proof.
What Is a Signal Extender?
A signal extender is a device that extends the range of a keyless entry car fob signal. Under California Penal Code § 466, the term includes a key fob amplifier or another device that extends the signal range of a keyless entry car fob to send a coded signal to a vehicle’s receiver. That signal may be used to lock, unlock, access the vehicle, start the engine, or interact with other remote commands tied to the vehicle’s onboard computer.
In plain English, police may describe this as a key fob relay device. These cases are different from carjacking allegations, which involve taking a vehicle from another person through force or fear. A signal extender case usually focuses on possession, vehicle access, and whether prosecutors can prove intent to break into or steal a vehicle. Prosecutors may argue that the setup allowed someone to unlock or start a car without having the physical key.
An electronic car theft device can be misidentified and not be connected to a car break-in. It may have been possessed for lawful work. It may have no connection to the vehicle named in the police report. Law enforcement must still connect the accused person, the device, the alleged intent, and the vehicle involved.
What Are Key Programming and Key Duplicating Devices?
California defines a key programming device or key duplicating device as a device capable of accessing a vehicle’s onboard computer to make additional keys, delete keys, or remotely start the vehicle without using any key. A key duplicating device also includes a component that can capture a key code or signal for remote access to a vehicle.
These definitions are broad. They may cover devices used by locksmiths, mechanics, dealership workers, automotive technicians, tow operators, security workers, or people who purchased programming equipment for lawful purposes. That breadth is exactly why intent is so important in a motor vehicle theft charge.
A device that can be misused is not automatically a burglary tool in every person’s hands. A screwdriver can be a repair tool or a burglary tool depending on the facts. The same concept applies here. Prosecutors must prove the device was possessed with the required criminal intent.
A key fob relay theft attorney may review receipts, work history, licenses, customer records, vehicle ownership records, repair orders, device logs, account history, and any other facts demonstrating lawful possession or lack of intent.
What Prosecutors Must Prove Under Penal Code Section 466
A possession-of-burglary-tools charge is not based on possession alone. Prosecutors must prove that the accused person possessed a listed tool or covered device and had the intent to feloniously break or enter into a building, vehicle, trailer coach, railroad car, aircraft, vessel, or other listed place.
For a signal extender or key programming case, prosecutors may rely on the device itself, the location of the arrest, nearby vehicles, time of day, statements, messages, surveillance footage, clothing, gloves, tools, or alleged flight from police. The defense should examine whether those facts actually prove intent or whether police are filling gaps with assumptions.
The prosecution may have problems if the device was found during a broad search, if several people had access to the same vehicle or bag, if police cannot prove who owned or controlled the device, or if the device was not connected to a specific attempted break-in.
Intent is often the center of the case. A person may possess automotive electronic equipment without planning to steal a car or break into a building. The defense should focus on what the evidence proves, not what the police suspected.
Is Possession of a Signal Extender a Misdemeanor or a Felony?
Possession of burglary tools under Penal Code § 466 is a misdemeanor. A standard California misdemeanor can carry up to six months in county jail, a fine of up to $1,000, or both.
That does not mean every key fob relay theft case is limited to Penal Code § 466. Prosecutors may add other charges if they claim someone entered a locked vehicle, took a vehicle, stole property, damaged property, possessed stolen property, or participated in an organized theft plan.
Related charges may include burglary, grand theft auto, unlawful taking or driving of a vehicle, receiving stolen property, vandalism, conspiracy, or attempted theft. The charge depends on what prosecutors claim happened, not just what device police found.
This distinction matters for case evaluation. A misdemeanor burglary tools charge is different from a vehicle theft case, a felony burglary case, or a multi-count complaint tied to several vehicles. The complaint, police report, search details, and evidence should be reviewed before anyone assumes the level of exposure.
When Police Find a Vehicle Theft Device During a Search
Many signal extender or key programming cases begin with a search. Police may search a vehicle, backpack, hotel room, phone, or storage area after a traffic stop, detention, arrest, probation search, warrant, or claimed consent.
The search itself may become a major issue. If police had no lawful basis to stop the person, extend the detention, search the car, open a bag, inspect electronics, or seize the device, the defense may challenge the evidence. A device that appears suspicious after the search may still be excluded if police violated the person’s rights in obtaining it.
An attorney should examine what the police knew before the search. Did they see the device in plain view? Did they have consent? Was there a warrant? Was the person on searchable probation or parole? Did police claim probable cause based on nearby vehicle burglaries? Did the officer extend a traffic stop to investigate unrelated suspicions?
Phone and account searches require separate attention. Police may try to use messages, photos, browser history, app data, or location records to prove intent. The defense should review whether the police had the authority to search that digital evidence and whether the data actually supports the prosecution’s timeline.
Evidence in Key Fob Relay and Car Theft Programming Device Cases
Theft crime cases often depend on technical evidence. The prosecution may claim a device could unlock or start a vehicle, capture a signal, communicate with a vehicle’s onboard computer, or create another key. That claim should be tested.
A burglary tool defense lawyer may review the device's make and model, whether it worked, whether it was powered on, whether it was connected to a target vehicle, whether it contained saved data, whether any vehicle access logs exist, and whether the prosecution can show actual use.
The vehicle evidence may also need to be reviewed. A police report may claim a car was targeted because it was nearby or because someone reported suspicious activity, which could influence the defense strategies. But the state may still need evidence tying the accused person to that vehicle. Surveillance video, owner statements, alarm records, vehicle access logs, fingerprints, DNA, property recovery, and body camera footage may all affect the case.
There may also be innocent explanations that defense attorneys can present to avoid a criminal charge. A person may own a vehicle and possess a programming device for maintenance. A locksmith or mechanic may have equipment for work.
A person may have purchased a device online without knowing how it was regulated. Another person may have placed the device in a shared vehicle, bag, or room. The defense should separate what the device can theoretically do from what prosecutors can prove the accused person actually intended to do in relation to auto theft.
How Intent May Be Misread in Lawful Possession of Locksmith Tools
Police may treat modern automotive technology as proof of criminal purpose because the device is unfamiliar or associated with car theft. That assumption can lead to weak cases.
Intent cannot be proven by suspicion alone. The prosecution may point to the time, location, nearby cars, clothing, tools, messages, or prior accusations. The defense may respond with lawful use, lack of connection to any vehicle, shared possession, device malfunction, incomplete investigation, or the absence of an attempted entry to counter the criminal charge.
A person’s silence should not be treated as proof of guilt. A person’s refusal to explain an electronic key-making device at the scene should not replace the prosecution’s burden of proof. Many people make things worse by trying to explain technical equipment during a police stop. A short statement meant to help may later be used out of context.
If police accuse you of possessing a signal extender, key programmer, or key duplicating device for vehicle theft, do not try to explain the technology without legal advice. The words used at the scene may be misinterpreted in the police report, the decision to file a criminal case, and the prosecutor’s theory.
Speak With a Los Angeles Key Fob Relay Car Theft Attorney
California’s updated burglary tools law gives prosecutors a newer way to charge cases involving key fob relay theft, signal extenders, key programming devices, and key duplicating equipment. But the law still requires proof of a criminal act.
If you are accused of possessing an unlawful signal extender, key programmer, key duplicating device, or other burglary tool, speak with a Los Angeles criminal defense attorney before talking to investigators or answering questions related to your case.
Contact the law office of William S. Kroger for a free, no-obligation consultation. Call 323-655-5700 or fill out our online contact form today.
Attorney William Kroger is a respected author, expert, and influencer, frequently sought by news organizations for his insights, expert analysis, and commentary on legal issues. He has been interviewed by national media outlets such as CNN, CNBC, Fox News, The Los Angeles Times, and The Orange County Register, as well as other national and local newspapers. His commentary spans topics from airport crimes, drug trafficking, and money laundering to white-collar crimes and complex criminal defense cases. Additionally, Attorney William Kroger has received the 10 Best Attorneys Award from the American Institute of Criminal Law Attorneys.
