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:

  1. 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.

  2. Permission issues

    • Make sure you are signed in with an account that has access to the correct property.

  3. Internal traffic filtering

    • Check for filters that exclude data.

Issue 2: Fewer conversions than expected

Possible causes and checks:

  1. 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.

  2. Data-processing delay

    • Allow 24–48 hours, particularly after changing settings.

  3. 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:

  1. Unfiltered internal traffic

    • Configure employee IP addresses using the Admin > Data Settings > Data Filters path described here.

  2. 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:

  1. Incorrect UTM parameters

    • Use a URL builder to create links with valid UTM parameters.

  2. 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:

  1. GA4 measures engaged sessions differently from UA

    • Check the engagement-time setting under Admin > Data Streams.

  2. 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.

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