There Are Two Google Ads Accounts Tracking This Site, and One Isn't Yours

You take over an account, read the tag manager container, and find two Google Ads conversion IDs firing on the same pages. One of them is the account you were given access to. Nobody can tell you what the other one is. It is still collecting conversions, every day, and somebody can see them.

This is one of the more common findings on an inherited site and one of the more awkward, because it is a technical problem with a commercial conversation attached to it. The fix takes ten minutes. Working out whether you are allowed to make it can take a fortnight.

How to recognise it

Google Ads conversion IDs take the form AW- followed by nine to eleven digits. Every account has one, and every conversion action in that account sits beneath it with its own conversion label.

Two distinct AW- IDs on one site means two separate Google Ads accounts are being told about conversions on that site. This is not the same as two conversion actions, which is normal and expected: one account can perfectly well track purchases, leads and phone calls as three separate actions, all under the same AW- ID.

You can check this without logging into anything, because the IDs appear in the published tag manager container and in the page source. Our free tracking scan reads both and reports a finding when it sees more than one, listing the IDs so you can compare them against the account you have access to.

Whose is it, usually

1. A previous agency.The overwhelmingly common answer. The relationship ended, access was revoked, and nobody removed the tracking from the site, because removal was not in anybody's offboarding checklist.
2. A second internal account. Larger clients sometimes have a brand team and a performance team running separate accounts, occasionally without either knowing about the other.
3. A manager account mix-up. The client was moved between MCCs at some point and tracking was reinstalled rather than migrated.
4. A reseller or franchise arrangement. Common in automotive, home services and multi-location retail, where a national account and a local one both advertise for the same site. This one is often legitimate and deliberate.

What it actually breaks

Two accounts tracking the same site is not automatically a disaster. What it breaks depends on whether both accounts are also spending.

If the other account is dormant

The practical harm is mostly disclosure. The conversion tag fires, the other account records a conversion, and whoever still has access to that account can see your client's conversion volume and value day by day. If that is a competitor agency, they have a live feed of how the account is performing under your management.

If the other account is also spending

Now it matters a great deal. Both accounts can legitimately claim the same conversion, because Google attributes within an account, not across accounts. A user who clicks an ad from account A and converts will be credited in account A. If they also saw an ad from account B within the attribution window, account B may credit it too.

• Neither account's reported conversion total matches the business, and the two cannot simply be added together without double counting.
• Both accounts are bidding on partial information, so both are optimising toward an incomplete picture of what works.
• The two accounts may be bidding against each other in the same auction, which raises the price the client pays for their own traffic.
• Reporting to the client becomes genuinely hard to do honestly, which is its own problem. We wrote about that conversation in how to explain tracking issues to clients.

Working out whose it is

You cannot look up the owner of a conversion ID. There is no public registry, and Google will not tell you. What you can do is narrow it down.

1. Check the container version history. GTM records who published each version and when. The email address on the version that introduced the tag is usually the answer, and it often still has access.
2. Ask the client who ran ads before you. Obvious, and frequently skipped. Most clients can name the previous agency even if they cannot find the contract.
3. Check for linked accounts. In Google Ads, under account access and security, look at who currently has access to the account you do control. Old agencies sometimes appear there too.
4. Look at the tag name and its neighbours. Tags are usually added in batches. If the mystery conversion tag sits next to a Floodlight tag and a LinkedIn tag added the same day, that tells you something about the agency that installed it.

How to remove it without causing an incident

The technical step is deleting a tag. The risk is entirely in deleting the wrong one, or deleting one that somebody is relying on and has not told you about.

1. Confirm which ID is yours. Open your Google Ads account, find the conversion action, and read the tag setup instructions. The AW- ID shown there is the one to keep. Do not do this from memory.
2. Get written confirmation from the client. A one line email saying they no longer work with the other party and want the tracking removed. This protects you if the franchise case turns out to apply.
3. Pause rather than delete, and wait. Pause the tag, publish, and give it a week. If the arrangement was legitimate, somebody will notice and get in touch, and a pause is one click to reverse.
4. Check for a hardcoded copy. Removing the container tag does nothing if the same snippet is also in the theme. Search the page source for the ID after you publish.
5. Verify your own conversions still fire. Complete a real conversion and confirm it appears in your account. Shared triggers are the usual way a cleanup breaks the thing it was meant to protect.

When the second account is supposed to be there

Sometimes the answer is that both accounts belong, and removing one would break a commercial arrangement you were not told about. This is normal in a few specific industries and worth recognising before you start deleting.

• Franchise and dealer networks. A national account runs brand campaigns, local franchisees run their own. Both legitimately want to measure conversions on the shared site.
• Co-op and manufacturer funding.Where a manufacturer subsidises a retailer's advertising, the funding is usually conditional on the manufacturer being able to see the results.
• Agency transitions in progress. During a handover both agencies may be running in parallel deliberately, for a period, so performance can be compared.

If one of these applies, do not remove anything. Instead, make the overlap explicit and manage it. Give each account its own clearly named conversion actions so nobody confuses them. Agree in writing which account is the source of truth for reporting. And be very clear with the client that the two accounts' conversion numbers cannot be added together, because the same sale will often appear in both.

The thing you want to avoid is both accounts bidding on the same keywords for the same site, which raises the auction price the client ultimately pays. That is a conversation for the client to have with the other party, but you are usually the person who notices it first.

The same pattern, other platforms

Google Ads is where this is most consequential because of the bidding, but the shape repeats.

• Two Meta pixel IDs on one site report the same action to two datasets, inflating reported conversions and leaving both datasets disagreeing with the orders. Worth reading alongside how to tell if your Meta pixel is broken.
• Two GA4 measurement IDs split sessions across properties or count them in both, and only the property linked to Google Ads influences bidding.
• Two tag manager containers usually means two owners, neither able to see what the other fires. That is its own audit, covered in auditing a container you didn't build.

What this does to your reporting in the meantime

While the second ID is still live, be careful how you describe conversion numbers to the client, because the honest position is more complicated than either account's dashboard suggests.

Your account is not over-reporting. It is reporting the conversions it can attribute, correctly. What you cannot say is that your number represents all the conversions the site produced, or that the difference between your number and the client's order count is a tracking fault on your side. Some of that gap is simply a second account taking credit in parallel.

Say so explicitly and in writing before anybody builds a forecast on it. The version of this conversation that goes badly is the one where the discrepancy surfaces in a quarterly review and you explain the second account for the first time. The version that goes well is the one where you flagged it in week one, which is also the version that makes you look like the person who found it rather than the person it happened to.

Put it in your onboarding

The reason this is so common is that nobody checks at the point where checking is cheap. On day one of a new account you have the client's attention, permission to ask awkward questions, and no history to defend. Six months in, finding a second conversion ID means explaining why you did not find it sooner.

Add a line to your onboarding: list every tracking ID on the site, and get the client to confirm each one. It takes a few minutes with a tracking scan and it turns an awkward discovery into a routine question.

After that, the problem is keeping it true. Tags get added by people who are not you, on sites you do not control, without telling anybody. Taglert watches every connected account every thirty minutes and tells you when tracking changes, which is the only way a day one audit stays accurate in month nine.