My left ear AirPods won’t get recognised by the phone. Even at full charge. It works for a day or so in between and then the same happens for 2 months.

Hi Codecode,

welcome to the Apple (user-to-user) Community.

Re: "My left ear AirPods won’t get recognised by the phone".

The "Related article" above your question has all the tips.

Eg: Sometimes a speck of dirt or wax can block an airPod.

You can try resetting the AirPods to see if that helps:

 How to reset your AirPods and AirPods Pro - Apple Support

Your iPhone may need updating to the latest compatible iOS version.

Eg: About iOS 16 Updates - Apple Support (says iOS 16.5 is the latest)

(The firmware on the AirPods can then be updated automatically when paired).

or

Sometimes restarting the iPhone restores order, if the AirPods have been pairing ok before. (How to: Restart your iPhone)

Try turning bluetooth off and back on.

Trouble-shooting tips: 

        What to do: If your AirPods won't connect - Apple Support

or

What to do: If you can't connect a Bluetooth accessory to your iPhone, iPad, or iPod touch - Apple Support

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Maybe there's wireless interference from the left side when in your usual position:

Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support

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More support . info. if needed:

AirPods Support Website:

Find all the topics, resources, and contact options you need for your AirPods....

AirPods Support - Official Apple Support

All the best :-)