Most Common Google Ads Mistakes | Audit Notes
This list is not theoretical: these are the mistakes I meet repeatedly in accounts I take over. The order is not random — it starts with what loses the most money.
1. Measurement broke silently
The most common and most expensive mistake. Conversion tracking stopped working after a theme or plugin update and nobody noticed. Campaigns run, no warning appears, only the conversion count is low.
That drop is usually mistaken for a performance problem and budget gets cut. In reality the ads work and the measurement does not. I start every audit with this check.
2. The same conversion counted twice
The second most common measurement error. A conversion imported from GA4 and Google Ads’ own tag are both set as primary; one sale appears as two.
The result is a picture better than reality. Cost per conversion looks low so budget is raised while real performance stands still. The fix is one source per conversion — detail on the GA4 link page.
3. Page views counted as conversions
No real conversion was defined, so page views or time on site were marked as conversions instead.
This makes smart bidding hunt the wrong person: it drifts toward people who browse easily and never buy. The algorithm delivers exactly what you asked for.
4. The location setting left on default
Google’s default location option shows ads to people interested in your area as well as those in it. For local service businesses that is direct waste.
Because the option sits in a submenu, most accounts never change it. Detail on the geographic targeting page.
5. No negative keyword list
The search terms report was never reviewed and the negative list is empty. With broad match in use, a meaningful share of budget goes to irrelevant searches.
This is the fastest mistake to fix with the quickest visible effect. I cover the method on the negative keyword management page.
6. Everything in one campaign
Different services, regions and intents all stuffed into a single campaign. Budget drifts to the most-clicked but least-converting side and nobody notices.
7. Brand and non-brand not separated
Because brand searches are cheap and convert well, they make the account look better than it is. Without the split, the fact that real growth has stalled goes unseen.
8. Limited ads overlooked
A disapproved ad is obvious, but ads in “limited” status appear to be running. Part of your reach stays quietly switched off. Detail on the policy violation page.
Want me to look at your account? I check this list against your account one by one and send the findings in writing. You can reach me from the contact page.
Frequently Asked Questions
Can I check these myself?
Most of them, yes. Testing measurement, reading the search terms report and checking the location setting need no technical knowledge. Enabling Quality Score columns is a few clicks.
Which fix produces the fastest result?
Negative keyword cleanup; the effect usually shows within a few weeks. Fixing measurement is more fundamental, but its effect appears as decisions change.
My account has most of these. Should I rebuild from scratch?
Usually not. Rebuilding loses historical data and learning; fixing the mistakes in order gives better results in most cases.