My left AirPod is silent but the right one works. Should I re-pair?

Only as a diagnostic, not as a fix. Open Settings → Bluetooth and tap the ⓘ next to your AirPods: you should see a separate battery figure for the left earbud, the right earbud and the case. If the silent earbud still reports its own battery, the AirPods are talking to the phone and the pairing is fine — the problem is physical, usually earwax packed over the speaker mesh, or a bad contact in the case. If the silent earbud shows no battery figure at all, it is not being detected, which points at the earbud or the case rather than at Bluetooth. Re-pairing tells you which of those two you have; it does not repair either one.

Does resetting AirPods delete anything?

It removes the shared pairing key from the earbuds and the case, so every device that knew them has to pair again — including the iPhone, the iPad, the Mac and the Apple TV. Nothing else is lost: your custom name and settings live on the phone and come back when you pair again. What you do lose is time, because it is the heaviest step in the list: it is worth doing only after you have checked the battery readout, the case and the fit, since it is not a fix for a blocked speaker or a battery that will not charge.

Why do my AirPods disconnect when I put the phone in my pocket?

Your body is mostly water, and water absorbs 2.4GHz radio energy very well. A phone in a front trouser pocket on the opposite side of your body from the earbuds has a much worse path than the same phone held in your hand, and the link drops. It is also why one side can go before the other: whichever earbud is nearer your body has the weaker path. Test it by holding the phone on the same side as the earbud that drops — if the problem moves or disappears, it was never the AirPods.

AirPods Only One Side Working or Keeps Disconnecting? What to Check First

Short answer: a silent earbud and a dropping connection are different faults, and re-pairing only treats one of them. Before you reset anything, work out which earbud is failing and whether it is being detected at all — that single question splits the problem in two, and it takes about thirty seconds.

The thirty-second split: is it detected, or is it silent?

Open Settings → Bluetooth, tap the ⓘ next to your AirPods, and look for the battery figures. You should see three numbers: the left earbud, the right earbud, and the case.

What you see	What it means	Where to look next
The silent earbud still reports its own battery	The earbud is detected, charged and connected — the pairing is healthy	Physical: blocked speaker mesh, a bad contact in the case, or a poor seal
The silent earbud shows no battery figure at all	It is not being detected, so nothing about it is connected	The earbud itself, or the case not charging it
The earbud's battery figure does not move across a day of use	It is not charging when it sits in the case	The case contacts, or debris in the earbud's stem
Both earbuds connect, but audio is only in one	Detection and charging are fine; the audio path is the problem	Earwax over the mesh, the fit, or the app playing the sound

That table is the whole point of this article. The overwhelming majority of "my left AirPod stopped working" cases sit in the first row: the earbud is detected, reports a healthy battery, and is genuinely connected — the sound just is not reaching your ear, because earwax has packed over the speaker mesh. Apple's own cleaning guidance for AirPods is a soft, dry brush plus a dry cotton swab, and it exists because this is the most common failure by a wide margin. No reset, no re-pair and no service visit fixes a blocked mesh.

If the phone shows a clean set of three battery figures, stop reading the Bluetooth troubleshooting and go clean the earbud.

Why earwax, and why only one side

It is not bad luck. Two structural reasons make one side fail first:

The earbuds point inward. The speaker mesh faces down the ear canal, which is exactly where wax accumulates. A few months of use is enough to glaze it over, and the glaze is invisible from the outside — the mesh looks fine until you hold it under a light and compare it with the other one.
Humans are asymmetric. Ear canal size and shape differ left to right, so the two earbuds sit differently. One side gets a tighter seal, which means more wax transfer and sometimes a poorer acoustic seal.

That second point is testable, and it is the single most useful test for the AirPods Pro: Settings → Bluetooth → ⓘ → Ear Tip Fit Test. It plays a short tone and tells you, per earbud, whether the seal is good. If it passes on the right and fails on the left, you have a fit problem, not a connection problem — try the next silicone tip size on that side only. Mixed sizes are completely normal and Apple designs for it.

Then there is the cleanest test of all: swap the earbuds. Put the left earbud in the right ear and the right earbud in the left ear. If the silence stays with the earbud, the fault is in the hardware. If the silence moves with your ear, the fault is in your ear — wax or a blocked canal — and no amount of resetting will help.

Four things that are not the problem

These get blamed constantly, and ruling them out early stops you from taking the AirPods apart in the wrong order.

Mono Audio. This setting sums both channels into both earbuds; it cannot silence one. What *can* silence one is the balance slider at Settings → Accessibility → Audio & Visual → Balance. It sits at centre by default, and it is easy to nudge while a phone is in a pocket. If the slider is off-centre, you will "lose" whichever earbud it was pushed away from.
Automatic Ear Detection. This pauses playback when you take an earbud out. With it off, the music keeps playing when you remove one earbud — which reads as "one side is dead" when you are actually holding the other earbud in your hand. Check Settings → Bluetooth → ⓘ → Automatic Ear Detection.
One earbud in use while the other charges. AirPods work perfectly as a single earbud. If you routinely use one at a time, the two earbuds drift apart in charge — and a pair where one side sits at 15% and the other at 90% is not broken, it is just unbalanced.
The other device holding the link. AirPods connect to one device at a time, and an iPad or Mac that grabbed them last will keep them. The link follows the *most recent* device, not the one you are holding. If your iPhone shows them as connected but you hear nothing, check the other device first.

What re-pairing actually fixes, and what it cannot

Pairing is a shared key stored on both sides — on the iPhone, and on the AirPods themselves. Re-pairing rebuilds that key. Nothing else.

That distinction draws a hard line:

Re-pairing fixes: "AirPods Not Your AirPods", a device that will not appear in the list, a connection that fails in the same place every single time, and the matching problem after a restore from backup or an iCloud sign-in on a new phone.
Re-pairing cannot fix: a blocked speaker mesh, a battery that never charges in the case, a microphone that fails on one side, and a link that drops mid-song and comes back on its own.

If the problem is in the second list, deleting the device and pairing again produces a satisfying success chime and leaves the fault exactly where it was. That is the test: if a clean re-pair is followed by a genuinely stable connection, the key was the problem. If the drop returns within the hour, the key was never the problem and you should stop touching it — the general two-fault split is covered in Bluetooth keeps disconnecting, which is worth reading once you have confirmed the AirPods themselves are fine.

One Apple-specific detail: delete the pairing on both ends. Forgetting the AirPods on the iPhone leaves the earbuds and the case still holding a key that no longer matches. With most headphones you clear the other end by long-pressing a button; with AirPods the equivalent action is the reset below.

The AirPods reset, and what the light is telling you

The AirPods reset is more thorough than a re-pair, and it is the only step that touches both earbuds and the case at once — which matters, because a stale key can live in the case rather than in the earbuds.

The sequence, with the light doing the talking:

Put both earbuds in the case and close the lid.
Wait about 30 seconds.
Open the lid and leave the earbuds in the case.
Hold the setup button on the back of the case for about 15 seconds.
Watch the status light: it starts white, then flashes amber a few times, then flashes white again. The reset has happened at the amber flash — the second white is the case already waiting to pair.

Some details that trip people up:

The earbuds must be in the case, lid open, for the button hold to do anything. Holding the button with the earbuds in your ears does nothing at all.
The amber flash is the signal, not an error. If you let go at the first white flash, you have not reset anything — you have just re-entered pairing mode. This is the single most common reason a "reset" appears to do nothing.
The reset clears the key for every device you own, not just the iPhone. Your iPad, Mac, Apple Watch and Apple TV all lose the pairing and will each need to pair again. That is why it is the last step and not the first.
Firmware is not affected, and a reset is not a firmware update. Check the version at Settings → Bluetooth → ⓘ → Version. Mismatched or outdated firmware is a real cause of one-sided behaviour, and it updates only while the AirPods are charging in the case, connected and near the phone — so a pair that is never left charging with the phone nearby can sit on old firmware for months.
AirPods 4 has no physical button on the back of the case. It uses the touch area on the front instead: double-tap it to trigger the reset. The light sequence is identical. The USB-C cases of recent models also play a chime, so you can listen for it rather than watching the light.

The order that wastes the least time

Do these in order, and stop as soon as the problem is gone. The order is deliberately earbud-first, because everything in the first two steps is cheap and reversible, while the last step costs you every pairing you own.

Regenerate the battery readout. Open the case next to the phone and read the three battery figures. No figure = not detected. A figure that never changes = not charging.
Clean both earbuds properly and compare the two meshes side by side under a light. Then try the Ear Tip Fit Test, and try swapping the earbuds between ears.
Check the balance slider and Automatic Ear Detection, and check which device currently holds the link.
Forget the device and re-pair — Settings → Bluetooth → ⓘ → Forget This Device. If the link is stable afterwards, you are done.
Reset the AirPods with the amber-then-white light sequence above, then pair again.
If a clean reset and re-pair still gives you a drop, and a second pair of headphones behaves normally on the same phone, the phone's radio is the remaining suspect. If instead one earbud stays silent while both report full battery, that earbud is the suspect. Either way this is now a hardware question, not a settings one.