Google Analytics 4 is powerful, but it's easy to make mistakes that compromise your data quality. Here are the most common errors we see and how to fix them.
1. Not Setting Up Enhanced E-commerce
Many businesses install the basic GA4 code but miss the enhanced e-commerce events that track the full customer journey.
✓ Solution: Implement view_item, add_to_cart, begin_checkout, and purchase events.
2. Ignoring Data Retention Settings
GA4 defaults to 2 months of data retention for user-level data, which limits your ability to analyze long-term trends.
✓ Solution: Go to Admin → Data Settings → Data Retention and change to 14 months.
3. Not Using Custom Dimensions
Without custom dimensions, you're missing crucial context like customer tier, product category performance, or campaign types.
✓ Solution: Define and implement custom dimensions for your key business segments.
4. Double-Tracking Page Views
When using both GTAG and GTM, page views can fire twice, inflating your metrics.
✓ Solution: Use only one implementation method and disable automatic page views in GTM if using GTAG.
5. Missing Cross-Domain Tracking
If you use a separate checkout domain or subdomain, sessions break and attribution fails.
✓ Solution: Configure cross-domain tracking in GA4 data stream settings.
More Mistakes to Avoid
6. Not Setting Up Conversions
Events alone don't tell you what's working. You need to mark key events as conversions.
7. Ignoring Internal Traffic
Your team's activity skews data, especially for low-traffic sites.
8. Not Using Filters
Development and staging environments should be excluded from production data.
9. Forgetting Currency Settings
Revenue reports are wrong if currency isn't properly set for each transaction.
10. Not Implementing Consent Mode
For GDPR compliance, you need proper consent handling before tracking.
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