Car Key Battery Replacement in Leicester — Try the Battery First. Then Call Us.
A fob that needs pressing twice, only works up close, or puts "key battery low" on the dash usually just needs a new coin cell — a two-minute job you can do at home, and we'll tell you so. If a fresh battery doesn't bring it back, the fob itself is the problem, and that is where we come in: repaired, replaced and programmed at your vehicle. Call 0333 772 1846 with your make, model and year and we'll tell you honestly which it is.
Accredited & trusted across the East Midlands
Most fob faults start with a flat battery. Here's how to tell.
The signs are familiar: you have to press the button two or three times, the car only unlocks when you are stood next to it, a keyless car stops noticing the key in your pocket, or the dashboard shows a “key battery low” message. In all of those cases the first thing to try is a new battery. Most fobs take a common coin cell — a CR2032 or CR2025 on many cars, a CR2450 or CR1620 on others — and the old cell or the handbook tells you which. Prise the case open at the notch with a plastic tool, note which way up the old cell sits, fit the new one and click it shut. Keyless cars will usually still start with a flat key battery by holding the fob against the start button or the spot marked in the handbook, so you are not stranded while you buy a cell.
A battery change on its own is rarely worth a call-out, so we will say so on the phone. When a fresh battery does not fix it, the fault is in the fob: worn buttons, a cracked circuit board, water inside the case, or a key that has lost its synchronisation with the car. That is where a mobile auto locksmith earns the call. Keyworx repairs fobs where that is sensible, replaces and programmes them where it is not, and does it at your vehicle in Leicester, Cambridgeshire and across the East Midlands.
Honest advice first
If it sounds like a battery, we tell you to try one before anyone sets off. No call-out fee for good advice.
Fob repair where it makes sense
Worn buttons, cracked shells and battery contacts can often be sorted without a new fob. We say which on the call.
Replacement fobs programmed on-site
When the electronics are gone we supply the right fob and code it to your car where it is parked.
Ownership checked first
V5C, photo ID or proof of purchase before we programme anything to your vehicle.
When a new battery isn't the fix
Four fob faults that look like a flat battery but aren't. Tell us which is yours.
01 · No response
New battery, still nothing
Check the cell is the right type and the right way up first. If it is, the contacts or the circuit board are usually at fault. We test the fob at the vehicle and tell you whether repair or replacement is the sensible route.
02 · Range
Only works up close
A weak cell is the usual cause, but a tired board or a damaged aerial track does the same. If a fresh battery makes no difference, the fob needs looking at.
03 · Buttons
Buttons worn or the case cracked
A new shell or button pad saves the fob and its programming. Where the board is damaged we replace the fob and programme it. See key fob replacement.
04 · Lost sync
Stopped working after the battery change
A few models drop their pairing when the cell is out for too long. Some re-sync with a sequence in the handbook; others need programming at the vehicle, which we do on the spot. See car key programming.
Not sure if it's the battery? Call 0333 772 1846 and describe what the fob is doing. We'll tell you straight whether to buy a cell or book us.
0333 772 1846How it works when the fob is the problem
Try the battery, then tell us what happened
Make, model, year and what the fob does with a fresh cell in it. That usually tells us whether it is a repair or a replacement.
We confirm a price and an ETA
Before anyone sets off. The cost depends on the fob type and whether programming is needed, so we make it clear up front.
Quick ownership check on arrival
Photo ID and proof you're the keeper or authorised — V5C, photo ID or proof of purchase. The step a serious, accredited locksmith never skips.
Repaired or replaced, programmed and tested
The fob is fixed or a new one coded to the car, then lock, unlock and start are checked before we leave.
Car key battery questions
Battery or fob?
Call with the make, model and year and what the fob is doing. We'll tell you honestly whether it's a cell from the shop or a job for us — no obligation.
0333 772 1846Related key services
New Battery, Still No Luck?
Call 0333 772 1846 with your make, model and year. We'll tell you whether it's the fob, confirm a price and a time, and repair or replace it where your car is parked.