Volkswagen Key Fob Battery Replacement: Which Battery It Takes (CR2032) and How to Change It
Nearly every Volkswagen key made since the mid-2000s takes a single CR2032, whether it is the familiar flip key or the keyless-start fob with the hidden emergency blade. A few keys take a thinner CR2025, so read the code on the old cell before you buy. On a flip key, fold the blade out and slide or pry the back cover off at the small slot near the pivot. On a keyless fob, press the release, pull out the emergency key and slide the back cover off. Fit the new battery the same way round, close the cover and press lock to test. No reprogramming is needed.
Volkswagen keys are among the easiest to service: one common battery, a cover that slides or pops off, and no screws. What goes wrong is small stuff: prying at the seam instead of the slot and chewing the plastic, fitting the battery upside down, or buying a CR2025 because it was in the drawer. This guide covers each style of VW key, how to start the car when the fob is dead, and what to check if a new battery does not fix it.
Which battery your Volkswagen key takes
| Key style | Typical part or FCC ID | Common on | Battery |
|---|---|---|---|
| Older flip key (rounded, 1999 to 2010) | 1J0 959 753, HLO1J0959753, NBG92596263 | Golf and Jetta Mk4 and Mk5, Passat B5.5 and B6, New Beetle, Touareg 2004 to 2010, Rabbit, GTI | CR2032 (read the code; a few differ) |
| Flip key (square-edged, 2010 to 2021) | 5K0 837 202, NBG010180T, NBG010206T, NBGFS12P01 | Jetta 2011 to 2021, Golf Mk6 and Mk7, Passat 2012 to 2022 (keyed), Tiguan 2010 to 2017, Beetle, CC, Eos, Touareg 2011 to 2017 | CR2032 |
| Keyless-start fob (no visible blade, emergency key inside) | 5G0 959 752, 3G0 959 752, NBGFS12P01, NBGFS12P02 | Golf Mk7 and Mk8 (keyless), Jetta 2019 on (keyless), Tiguan 2018 on, Atlas, Atlas Cross Sport, Arteon, Taos, ID.4, ID. Buzz, Touareg 2019 on | CR2032 |
A CR2025 looks identical to a CR2032 but is 0.7 mm thinner, and it will sit loose in a VW key designed for the CR2032. If your old cell says CR2025, buy that; if it says CR2032, do not substitute. The code on the flat + face of the old battery is the final word.
The first two digits of a coin cell code are the diameter in millimetres and the last two are the thickness in tenths of a millimetre. Our CR2032 vs CR2025 guide explains the difference, and the key fob battery size chart covers every common size.
What you need
- One new CR2032. Panasonic, Varta, Energizer, Duracell or Murata; VW dealers sell the same cells
- A small flat-blade screwdriver, a coin, or a plastic pry tool
- A clean surface with good light
Avoid rechargeable LIR2032 cells. They are the same shape but a higher voltage than the key is designed for.
Changing the battery in a Volkswagen flip key
Press the release button so the key blade swings out and locks. Hold the key with the buttons facing down.
On the 2010-and-newer square-edged key, look for a small slot on the back near the blade pivot; push a fingernail or flat tool into it and the back cover slides down and off. On the older rounded key, there is a notch on the seam at the key-ring end; put a coin or flat screwdriver in it and twist gently to pop the back half off. Stay in the slot rather than prying around the seam.
On VW keys the + side with the code normally faces up towards you once the cover is off. Take a photo before you touch it.
Lever it up at the cut-out beside it with a plastic tool or fingernail and lift it out by the edge. Keep metal tools off the circuit board.
Hold it by the edge and press it in the same way round. It should sit flat under the retaining tab without rocking.
Slide or snap the cover back on until it clicks, fold the blade in, and press lock and unlock. The LED flashes with each press when the battery is good.
The immobilizer chip that lets the car start is sealed in the key and does not use the battery. A flip key with a dead battery still turns the ignition and starts the engine; you only lose the remote buttons.
Changing the battery in a Volkswagen keyless-start fob
- Press the release button on the back and pull the emergency key blade out.
- With the blade out, put a thumb on the back cover and push it towards the end the blade came from. On some fobs you first lift the cover at the small notch the blade exposed. It slides a few millimetres and lifts off.
- Note which way the CR2032 faces, then lever it out at the cut-out beside it.
- Press in the new cell the same way round, slide the cover back until it clicks, and refit the emergency key.
CR2032 3V lithium coin battery
Nearly every Volkswagen flip key and keyless fob takes a CR2032. Buy a name brand in a small multi-pack, check the date on the pack, and keep the spares in the glove box.
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Do you need to reprogram a VW key after a battery change?
No. The pairing is stored in memory that does not need battery power, so the key works as soon as the new cell is in. If the cluster showed Key battery low or a key symbol, it clears after the next start or two. One VW habit worth knowing: if the remote does not respond after the battery was out for a long time, put the key in the ignition (or press Start with the fob held to the column) and switch on once; that re-syncs the rolling code. Programming is only needed for a key that is new to the car.
If the car still says the key is not detected
First, start the car. On a keyless-start VW, hold the fob against the steering column just below the Start button, press the brake and push Start; the car reads the chip through a backup antenna there. On older keyless Golfs and Passats with a slot on the dash, push the fob into the slot instead. The emergency key blade opens the driver’s door; on fobs with no visible keyhole, the lock cylinder is under a small cap on the handle.
Then check, in this order:
- Battery size. A CR2025 in a CR2032 holder sits loose and makes patchy contact. Compare the new code with the old one.
- Battery upside down. No LED flash at all usually means the cell is reversed.
- Flattened contact. The spring contact can be pressed down while prying. Lift it gently with a plastic tool and wipe it with a dry cotton bud. See how to clean key fob battery contacts.
- A flat new battery. Unbranded multi-pack cells and cells that have sat for years can be dead in the packet. Try one from a fresh, dated pack.
- The car’s 12 V battery. If the car was also slow to crank, the key is not the problem. See can a bad car battery cause key fob problems.
- Damage inside the key. A key that has been dropped hard, through the wash or left on a hot dash can have a cracked solder joint. A locksmith can test whether it still transmits before you pay for a new key.
The full checklist is in key fob not working after a battery replacement.
What it costs
Most VW parts counters will fit a battery while you wait for the price of the cell plus a few dollars, and some do it free during a service visit. The larger figures only apply when the key itself has to be replaced, which a battery change almost never leads to.
How long the new battery will last
A flip key only transmits when you press a button, so its CR2032 normally lasts three years or more. A keyless-start fob listens for the car and answers every time you touch a handle, so expect one to two years. Cold winters, leaving the fob within a few feet of the car overnight, and carrying it loose where items press the buttons all shorten that. See how long key fob batteries last for a sensible replacement schedule.
Safety: keep coin batteries away from children and pets
A swallowed coin cell can cause serious internal burns within hours. Keep spares and the old cell out of reach, and take old batteries to a drop-off point rather than household waste. If you think a child has swallowed a battery, go to the emergency room straight away and call the National Battery Ingestion Hotline at 1-800-498-8666, or Poison Help at 1-800-222-1222.
Frequently Asked Questions
Almost all VW flip keys and keyless-start fobs take a CR2032. A few take a CR2025, so confirm with the code printed on the old battery.
Fold the blade out, then push a fingernail or flat tool into the small slot on the back near the pivot and slide the back cover off. On older rounded keys, twist a coin in the notch at the key-ring end to pop the back half off.
No. VW keys keep their pairing without battery power. If the remote is slow to respond afterwards, switch the ignition on once with the key and it re-syncs.
Hold the fob against the steering column below the Start button, press the brake and push Start. Older keyless models have a dash slot to push the fob into. Use the emergency key blade to open the driver’s door.
Not reliably. The CR2025 is thinner, so it sits loose and gives patchy range. Use the code the key was designed for.
Check that the new cell is the right size, the right way up, and from a fresh pack, and that the contact spring was not flattened. If the fob LED flashes but the car ignores it, use the backup start and have a locksmith test the fob.