The $169 Lesson: When Google Ads Conversion Tracking Quietly Breaks

Last year we ran a Google Ads campaign for our own agency. Seven days, 17 clicks, S$169 spent, zero conversions recorded. The ads were fine. The landing page was fine. Real enquiries were still arriving. The tracking had silently broken, so every enquiry we paid for was invisible to Google. If your clicks look normal but conversions have flatlined, here is how it happens and how to catch it.

The week Google saw nothing

Nothing looked wrong. The ads were serving, the page loaded fast, the form worked, and leads kept reaching our inbox. But the code that tells Google "this click became an enquiry" had stopped firing after a site update. No alert, no error. We caught it in a weekly review: a week of spend, nothing recorded. Tracking does not break loudly. It goes quiet.

Why is this worse than a reporting bug?

A reporting bug understates your results. A tracking break rewires how Google spends your money. Smart Bidding, Google's automated bidding system, learns from conversions. Feed it zeros for a week and it optimises toward nothing: bids drift away from the searches and audiences that were working, and cost per lead decays while spend continues at full price. When tracking returns, the algorithm has a week of false history to unlearn.

Where does conversion tracking silently break?

Almost never inside Google Ads itself. It breaks on your website, usually right after something changed. The four patterns we now check for:

• A site rebuild drops the event fire. The new site looks identical, but the conversion snippet never made it across.
• A form handler changes. The form still submits, but the success event never triggers.
• A new landing page ships without the analytics tag. Every click sent there is invisible.
• Consent settings block the ping. A cookie-banner update stops the conversion call leaving the browser.

None of these show an error. The site works; only the measurement dies. Meta's pixel fails the same way, so if you run both platforms (see our Google Ads vs Meta Ads guide), each needs its own check.

The rule we follow now: test before every deploy

We now smoke-test the conversion path before every deploy. Submit a flagged test enquiry on the live page, watch the conversion events fire in the browser's developer tools, then delete the test lead. Two minutes, every deploy, no exceptions. A habit that cheap, preventing another S$169 week (or a S$5,000 month on a bigger account), earns its place.

Not sure where you stand? Run your account through the checklist below: eight yes-or-no questions, honest verdict.

The 10-minute check any owner can do

You do not need to read code. Ten minutes in Google Ads:

1. Chart clicks and conversions over 90 days. They should move together. Steady clicks with a flatline that starts on the date of a site change is the classic signature.
2. Compare conversions to your inbox. If WhatsApp and email brought 12 enquiries and Ads shows 2, the gap is your answer.
3. Ask whoever runs the account: "show me a conversion firing live, this week." Screen-share, submit a test, watch it register.

Hiring or auditing an agency? Our Google Ads agency hiring guide treats that third item as non-negotiable, and our look at what good SEM management looks like shows the weekly routine that catches breaks early.

Common questions about conversion tracking

Written by the Aphyx team · Published 28 August 2026 · Last updated 28 August 2026