Key Fob Not Working in West London

If your key fob is not working, we can help anywhere in West London. From unresponsive buttons to “key not detected” warnings, our mobile auto locksmiths diagnose and fix remote and smart key faults on the roadside across the W postcode area. With 10+ years’ experience, dealer-level diagnostics, and insured, DBS-checked technicians, we get you moving again quickly and safely.

When Your Key Fob Stops Working

A faulty car key fob can be frustrating, especially when you’re trying to get to work or collect the kids. Common symptoms include:

• Buttons do nothing, central locking won’t respond
• Car displays “Key Not Detected” or a red key symbol on the dash
• Intermittent operation: works only when held close to the car
• Boot release works but lock/unlock does not (or vice versa)
• Car starts only when fob is pressed against the start button
• Very short range or you must press buttons several times
• After replacing the battery, the fob still doesn’t work

These issues can be caused by a flat or wrong-type battery, worn buttons, a damaged circuit board, water ingress, desynchronisation after a low battery, transponder chip faults, antenna or receiver issues, or a problem with the vehicle’s immobiliser. Whether you drive in Hammersmith, Ealing, Chiswick, Notting Hill, Kensington, or anywhere else within the W postcodes, our mobile team will come to you.

How We Fix Key Fob Problems

We use non-destructive methods wherever possible and explain any rare exceptions before work begins. Our process is simple and transparent:

1. Initial Diagnostics

• Verify battery type/fit, measure output, and inspect the PCB and buttons
• Run OBD2 diagnostics to check immobiliser, key status, and fault codes
• Test RF signal strength and frequency, and confirm transponder communication

2. Repair Where Possible

• Replace key fob battery with the correct spec and reseal
• Micro-soldering for button pads or loose components, flip key hinge or blade repairs
• Clean and dry PCBs after water damage where salvageable
• Relearn/resynchronise the remote to the car

3. Reprogramming or Replacement

• Remote and transponder programming using dealer-level tools
• EEPROM/ECU immobiliser programming for certain models when needed
• Supply and program new remote, smart, or proximity keys if the original is beyond repair

4. Final Testing

• Confirm lock/unlock/boot functions, range performance, and starting
• Provide a brief demonstration and any usage advice (e.g., emergency start method)

If your fob cannot be saved, we can provide on-the-spot replacement and programming—often far quicker and more convenient than a main dealer. For deeper immobiliser issues, see our dedicated Car Key Programming service.

Why Choose Our West London Auto Locksmiths

• Local and Mobile Across W Postcodes
  We cover the whole of West London, including Ealing, Acton, Shepherd’s Bush, Bayswater, Maida Vale, Paddington, Kensington, Hammersmith, Chiswick, Hanwell, Brentford, and more. Efficient dispatch means help comes to you.

• 10+ Years’ Experience
  Our technicians are trained on modern immobiliser systems (2024/2025) and work daily with Ford, VW, BMW, Mercedes-Benz, Audi, Toyota, Vauxhall, and many others.

• Dealer-Level Diagnostics and Equipment
  We use advanced OBD2 tools, EEPROM programming where required, and manufacturer-level software to code remotes, transponders, and smart keys.

• Non-Destructive First Approach
  We prioritise repair and reprogramming before replacement. If any invasive work is necessary, we explain clearly and agree next steps with you.

• Insured, DBS-Checked, and Guaranteed
  We carry public liability insurance, our team is DBS-checked, and our workmanship and supplied keys are backed by warranty.

• All Key Types and Vehicles
  Remote fobs, flip keys, transponder keys, smart/proximity keys, and push-to-start systems. Cars, vans, and many commercial vehicles supported.

If your fob failure has left you locked out, our Vehicle Unlocking service can gain entry without damage in the vast majority of cases. If you’ve lost the only key, head to Lost or Stolen Car Keys for guidance on secure replacements and deactivation of old keys.

Common Causes of a Non-Working Key Fob

• Flat or incorrect battery: Some fobs require specific cell types with the right orientation and contact pressure
• Worn buttons or cracked housings: Frequent use can wear through the button membranes or flip hinges
• Water or impact damage: A drop in the sink or on the pavement can break solder joints or corrode tracks
• Desynchronisation: After a low battery or multiple presses out of range, the rolling code can go out of sync
• Transponder chip issues: Car starts are blocked if the immobiliser chip is faulty or missing, even if locking works
• Vehicle receiver/antenna faults: The car itself may have a weak receiver, aerial ring (antenna) fault, or central locking control unit issue
• Software updates or battery disconnects: Sometimes the immobiliser or BCM needs a relearn after electrical work

Whatever the cause, we’ll identify it and advise whether a repair or a replacement fob is the most cost-effective fix.

Repairs, Replacements, and Programming Options

• Key Fob Battery Replacement
  Quick, correct-spec cell replacement with a seal check. We’ll test range and function after fitting.

• Key Fob Repair

• Button membrane and micro-switch repair

• Flip key hinge and key blade replacement

• PCB cleaning and micro-solder reflow for cracked joints
  Note: Repair suitability depends on damage level and parts availability.

• Key Fob Replacement
  We supply quality aftermarket or OEM remotes and smart keys. All replacements are programmed to your vehicle and tested on-site.

• Transponder and Smart Key Programming
  Using advanced OBD2 and, when required, EEPROM/ECU immobiliser programming for complex cases.

• Spare Key Service
  Once we’ve restored functionality, we can cut and program a spare so you’re not stranded if the primary fob fails again. See Car Key Replacement.

Service Area Across West London

We’re a fully mobile auto locksmith covering the W postcode region, including neighbourhoods such as Ealing, Acton, Chiswick, Hammersmith, Shepherd’s Bush, Kensington, Notting Hill, Bayswater, Maida Vale, Marylebone, Paddington, and beyond. We also regularly attend addresses and workplaces near major routes and landmarks across West London. Wherever you are in W postcodes, we bring the workshop to your kerb.

Explore the specific locations we cover in Areas We Cover Across W Postcodes.

What To Do Right Now If Your Key Fob Isn’t Working

• Try your backup key if you have one
• Replace the fob battery with the correct type (we can advise)
• If it’s a push-to-start vehicle, hold the fob against the start button and press brake/clutch while starting—many models have an emergency start coil
• Avoid forcing the flip blade or prying the case with metal tools—this can damage the PCB
• Call us for quick diagnostics and a proper fix

If you’re stuck and need to get in immediately, use our car unlock service in West London.

Supported Makes and Models

We handle all major brands, including Ford (Focus, Fiesta, Transit), Volkswagen, Audi, BMW, Mercedes-Benz, Vauxhall, Toyota, Nissan, Kia, Hyundai, Peugeot, Renault, Skoda, Land Rover, Mini, Volvo, Honda, Mazda, and more. See all brands we cover.

Security, Insurance, and Guarantees

• Public liability insurance for your peace of mind
• DBS-checked technicians
• Warranties on keys and workmanship
• Clear explanation before any non-standard or invasive work
• Data-safe and secure processes when accessing immobiliser systems

We also offer advice on anti-theft and vehicle security upgrades if your issue stems from attempted theft or damage.

FAQs

Why is my key fob not working after a battery change?

Often the cell is the wrong type, fitted upside down, or the terminals are bent so they don’t make contact. Some cars require a quick resync after a battery swap. We’ll check the battery, contacts, and reprogram if needed.

My car says “Key Not Detected”. What does that mean?

For smart keys, the vehicle isn’t seeing the fob via the proximity antenna. Causes include a flat fob battery, faulty fob, damaged antenna ring, or immobiliser issues. We can test both the fob and the car’s receiver to pinpoint the fault.

Can you repair a water-damaged key fob?

Sometimes. If the PCB isn’t heavily corroded, we can clean and micro-solder to restore function. If the chip is damaged, a new fob with programming is the reliable fix.

Can a locksmith program a key fob without going to the dealer?

Yes. We offer dealer-level programming for most makes, including transponder and smart key systems. For complex cases we can perform EEPROM/ECU immobiliser programming. Learn more on our Car Key Programming page.

How long does it take to fix a non-working key fob?

Simple fixes (battery, resync) can be minutes. Repairs or replacements with programming typically take 30–60 minutes depending on the vehicle and system.

What if I’ve lost my only key fob?

We can create a new key, program it to your car, and securely delete the missing fob from the immobiliser. See our guidance on lost or stolen car keys.

Will you damage my car?

No—our approach is non-destructive wherever possible. If any trim removal or exceptional measures are required, we’ll explain clearly and get your approval before proceeding.

Next Steps

• Stuck right now? We can unlock your car and get you going
• Need diagnostics and repair? We come to your home, work, or roadside across West London
• Want to prevent a repeat? Ask about a spare key and protective cases

For immediate help, call us or request a fast quote. If your issue turns out to be a different fault (e.g., ignition barrel or central locking module), we’ll advise the best fix or refer you to the relevant service such as car lock and ignition issues.

Need help now? Call 020 4634 1817 or Email us.

Helpful links

• Auto locksmith services in West London
• Car key programming
• Car key replacement West London
• Contact our West London team