Google Ads Diagnosis
Users are clicking your ads and leads or sales may be happening — but conversions are missing, delayed, duplicated, underreported or attributed incorrectly. This isn't just a reporting problem: broken tracking affects bidding, budget allocation and your ability to tell whether Google Ads is actually profitable.
Short Answer
Google Ads optimises on the data you give it — broken tracking quietly corrupts bidding. The nine usual instrumentation failures are the tag itself, GTM triggers, page-load firing, GA4 import, auto-tagging, redirects, consent configuration, duplicates and the wrong primary conversion.
Conversion data influences campaign reporting, keyword decisions, budget allocation, automated bidding, Target CPA, Target ROAS, Performance Max optimisation, audience signals and customer acquisition decisions. If your conversion tracking is wrong, your optimisation decisions are wrong too — however good the campaign structure looks on the surface.
Symptoms
Likely Causes
Tag
Where to check: The tag may not be installed on the required page or event.
GTM
Where to check: The tag exists but doesn't fire under the correct conditions.
GTM
Where to check: Firing on load instead of successful completion creates duplicate or false conversions.
GA4
Where to check: The GA4 event may exist but isn't configured or imported into Google Ads correctly.
Attribution
Where to check: Missing GCLID information interferes with attribution and measurement.
Attribution
Where to check: Landing page redirects may remove advertising identifiers.
Consent
Where to check: Consent implementation can affect tag behaviour and available conversion data.
Configuration
Where to check: Multiple tags or imported events can count the same action more than once.
Configuration
Where to check: Google Ads may optimise toward low-value actions instead of meaningful outcomes.
Diagnostic Workflow
Sources, primary/secondary conversions, counting settings, attribution, conversion windows and values.
Tags, triggers, variables, data layer events, duplicate firing, preview mode behaviour.
Events, key events, Google Ads linking, imported conversions, attribution configuration.
Real user journeys — forms, calls, WhatsApp clicks, purchases, bookings, sign-ups, thank-you pages.
GCLID, GBRAID, WBRAID, UTM parameters, redirect behaviour, cross-domain tracking.
Signal: Where data is available, validate Google Ads conversions against CRM records, form submissions, calls, bookings or sales data — the objective isn't identical numbers across every platform, it's confidence that each system is configured correctly.
Measurement
Broken tracking doesn't just misreport results — Smart Bidding learns from the corrupted data, so budget allocation and bidding decisions degrade with it.
Some difference between analytics platforms is expected — they use different attribution models and reporting rules. Large, unexplained discrepancies need investigating.
This guide diagnoses tracking that's supposed to work and doesn't. If tracking was never properly implemented, that's a setup project, not a repair.
When to Escalate
Should you run Google Ads without working tracking? For most performance campaigns, no. You may keep receiving traffic and leads, but without reliable conversion measurement you can't accurately evaluate performance, automated bidding gets weaker signals, budget allocation becomes less reliable, wasted spend becomes harder to find, and scaling decisions get riskier. Tracking is core advertising infrastructure — not an optional reporting feature.
Related Guides
Tools & Next Checks
FAQ
Find out what's broken, fix the measurement infrastructure, then optimise using data you can actually trust.
