Wi-Fi on the MacBook Air M2 has a tool built in that most owners do not know: hold the Option key, click the Wi-Fi icon in the menu bar and choose Open Wireless Diagnostics, which Apple's page describes for a Mac that connects to the router but struggles to load pages, send email or stream. It analyses the connection, reports the signal and the noise, and can record a log for support. Option-clicking the menu icon also shows the network's channel, signal strength and PHY mode. Apple's Wi-Fi page gives the basic order: make sure Wi-Fi is on, restart the router, restart the Mac, and join the network again.
If the Mac connects but pages do not load, the DNS may be at fault, so open System Settings, Network, Wi-Fi, Details, DNS and add a public server.
The checks in more detail
Remove the network and rejoin with the password, check for a VPN, and create a new Network Location for a clean set of settings. The M2 Air supports 2.4 and 5 GHz Wi-Fi 6, so a router that lists a Wi-Fi 4 mode only may be slow. The M2 Air's Wi-Fi is Wi-Fi 6, and it sits in the hinge area, so a laptop with a thick case or on a metal stand can lose signal; use it on a desk.
Wireless Diagnostics' Monitor mode, also under the Window menu, records signal over time and shows drops, which helps when problems are intermittent. A Mac that has been up for weeks can also hold stale network state, and a restart refreshes the Wi-Fi and DNS caches; many owners see Wi-Fi problems clear after a restart before any setting changes. Keep the router's firmware current too, since old firmware has bugs with newer clients.
Differential
Likely causes of “Apple MacBook Air will not connect to Wi-Fi or keeps disconnecting”, and how to tell them apart
- 1
A weak signal or noise
What separates it The Option-click shows poor signal or high noise
How to confirm Move closer or change the router's channel
- 2
DNS trouble
What separates it Connected but pages will not load
How to confirm Add a public DNS in the Wi-Fi details
- 3
A stale network entry
What separates it The Mac keeps failing to join
How to confirm Forget the network and join again
- 4
A VPN or filter
What separates it Pages fail only when the VPN is on
How to confirm Turn it off to test
- 5
A router that needs a restart
What separates it Several devices struggle
How to confirm Restart the router
Before you touch a setting
Record this first — changing settings destroys the evidence
- The signal, noise and channel from the Option-click menu
- Whether other devices work
- Whether a VPN is on
- The router model and band
Try in this order
0 of 8 completedOption-click the Wi-Fi icon
ReversibleRead the channel, signal and noise values.
Run Wireless Diagnostics
ReversibleChoose Open Wireless Diagnostics and follow the prompts.
Restart the router and the Mac
ReversibleUnplug the router for thirty seconds.
Forget the network and rejoin
ReversibleSystem Settings, Wi-Fi, Details, Forget This Network.
Change the DNS
ReversibleNetwork, Wi-Fi, Details, DNS: add a public server.
Create a new Network Location
ReversibleTo test with clean settings.
Run the Monitor tool
ReversibleIn Wireless Diagnostics, Window, Performance, to see signal over time.
Test on a desk away from metal
ReversibleMove the Mac off a metal stand.
Model-specific
What is true of this model and not of its siblings
- A built-in tool
- Wireless Diagnostics saves a log you can send to support.
- Signal and noise
- Their gap decides the quality.
- Performance graph
- It shows when the signal dips.
- Metal stands
- They shield the antenna.
Stop boundary
When this stops being a self-service repair
- !If Wireless Diagnostics reports a fault on several networks, contact Apple Support
- !If only your router fails, ask its maker
- !Save the diagnostics log for support
Evidence ledger
Sources behind this answer
Exact questions
Common questions
How do I run Wireless Diagnostics?+
Hold Option and click the Wi-Fi icon.
Why is my Mac slow on Wi-Fi?+
Signal, noise or DNS.
Does the M2 Air support 5 GHz?+
Yes, 2.4 and 5 GHz.
Should I change the DNS?+
If pages fail but the link is fine.
How do I see Wi-Fi drops over time?+
Use Wireless Diagnostics' Performance window.
Does a metal stand matter?+
It can.