Google Analytics 4 collects and analyses data, but implementation issues can affect its accuracy and completeness. This guide reviews common problems and troubleshooting steps.
Issue 1: No data appears in GA4
Possible causes and checks:
The tracking code (gtag) is missing or not running
Check that the tracking code is installed on every relevant page.
Use Google Tag Assistant to check whether it is active.
Permission issues
Make sure you are signed in with an account that has access to the correct property.
Internal traffic filtering
Check for filters that exclude data.
Issue 2: Fewer conversions than expected
Possible causes and checks:
Incorrect event settings
Check Admin > Events to see whether the event is received correctly.
Check the event's conversion setting under the Events > Conversions labels referenced in this guide.
Data-processing delay
Allow 24–48 hours, particularly after changing settings.
Google Tag Manager implementation issues
Use debug mode to check that the tag fires correctly.
Issue 3: High levels of internal traffic
Possible causes and checks:
Unfiltered internal traffic
Configure employee IP addresses using the Admin > Data Settings > Data Filters path described here.
Bots and spam
The original guide refers to the setting "Exclude all known bots and spiders".
Issue 4: Traffic sources are not identified correctly
Possible causes and checks:
Incorrect UTM parameters
Use a URL builder to create links with valid UTM parameters.
Unfiltered referrals
Review recognised domains in the referral settings under Admin > Data Streams, as described here.
Issue 5: An unusually high or low bounce rate
Possible causes and checks:
GA4 measures engaged sessions differently from UA
Check the engagement-time setting under Admin > Data Streams.
Event implementation issues
Check that events are sent correctly and represent real interactions.
Summary
Systematic checks help identify GA4 implementation problems. Tools such as Google Tag Assistant and debug mode can support troubleshooting.
