GA4’s cruellest property is that it produces confident-looking numbers whether or not it is configured correctly. Broken measurement does not look broken; it looks like dashboards. These are the five failures I find most often in audits, each fixable in an afternoon, each expensive for as long as it stands.
1. Page views promoted to conversions
The classic: someone marks a page view or a scroll as a conversion event, and suddenly the business “converts” at fifteen percent. Every downstream decision, bidding, budgeting, judging campaigns, inherits the inflation. Conversions should be things the business would celebrate: a form submitted, a call clicked, a purchase completed. Nothing else.
2. Internal traffic counted as customers
Your team visits your site more than any customer does. Unfiltered, they inflate engagement, pollute conversion paths and make weak pages look loved. Define internal IPs, filter them, and watch several “insights” evaporate.
3. Consent Mode missing or half-installed
UK and EU visitors who decline cookies vanish entirely from an unconfigured setup, sometimes a third of your traffic, silently. Consent Mode v2, installed properly, lets Google model that gap instead of ignoring it, and keeps your ad platforms compliant at the same time.
4. Ads and Search Console never linked
Unlinked accounts mean Google Ads optimises against its own attribution while GA4 tells a different story, and organic query data never reaches your reports at all. The links take minutes and end a permanent source of arguments about whose number is right.
5. Calls and WhatsApp not counted at all
For service businesses, calls and WhatsApp messages are often the majority of real leads, and the default setup counts none of them. Click-to-call and WhatsApp click events belong in every service business’s conversion set, or your best-performing pages will keep looking like your worst.
The uncomfortable part: GA4 only processes forward. Every week these stand is a week of baseline you never get back, which is the whole argument for a proper setup and audit now rather than after the next campaign.