Faulty conversion tracking is the most common reason for poor Google Ads performance. When conversion data is inaccurate, Smart Bidding optimizes on wrong signals and budget is deployed inefficiently.
The Three Tracking Pillars
Google Ads Conversion Tag: Created in Google Ads, deployed via GTM. Optimal for measuring conversions from ad clicks. Recommended as primary bidding source.
GA4 Key Events: Events configured in GA4 and imported to Google Ads. Advantage: consistent data across channels. Disadvantage: GA4 data is sampled and may diverge from Google Ads data.
Enhanced Conversions: Supplements standard tracking with hashed first-party data for more accurate attribution — especially important as cookie restrictions increase.
Consent Mode V2
Mandatory in the EU since March 2024 for Google advertising products. Communicates user consent status to Google tags. Without consent, no cookies are set, but Google models conversions from anonymized signals. Ensure your CMP supports V2 and GTM tags are correctly configured.
GA4 Import Configuration
Link GA4 and Google Ads correctly. Select appropriate events as Key Events. Mind attribution settings. Regularly verify conversion alignment between platforms.
Common Mistakes
Duplicate counting (both Ads tag and GA4 import active as primary). Wrong conversion values. Consent Mode not implemented. Key Events set too liberally.
FAQ
Google Ads tag or GA4 import — which is better? For bidding: Google Ads Conversion Tag as primary. GA4 import supplementary for cross-channel analysis.
How do I verify tracking works correctly? Google Tag Assistant, GA4 DebugView, and Google Ads conversion diagnostics show errors in real time.
