container audit

GTM-MRV29VWM

51 tags, 6 custom scripts, 1 third-party host — an ordinary container, near the middle of what we measure (median: 39 tags, 4 custom scripts).

6 custom HTML tags carrying 6 KB of JavaScript. This runs on every page the container loads on.
1 third-party host reachable from its tags.

Tags51

Custom scripts6

Third parties1

Delivered437 KB

Versions26

What we observed

A real browser loaded peugeot.fr a month ago and recorded every request it made. This is what happened, as distinct from what the container is configured to do. It is one page load — anything that fires only deeper in the site did not fire here.

Container loaded from googletagmanager.com — Google

Measurement sent to peugeot-g10-server-side-tagging-prod-406671236336.europe-west9.run.app — not Google

Measurement is first-party; the container still loads from Google. These are separate decisions, and this is the more common of the two.

Forwarded to GA4 ×8 — read from the measurement id, not the hostname

Consent a consent banner was present and we accepted it. Measurement fired beforehand but carried no identifier — analytics_storage was denied, which is Consent Mode working as designed rather than a gap. 2 hosts appeared only after consent was granted. Google recorded gcs=G100 (all denied).

Third parties contacted 25 hosts — rum.hlx.page, schema.milestoneinternet.com, ressource.gdpr-banner.awsmpsa.com, cdn-eu.dynamicyield.com, st-eu.dynamicyield.com, api.gdpr-banner.awsmpsa.com, europe-west1-cookiebannergdpr.cloudfunctions.net, api2.gdpr-banner.awsmpsa.com, and 17 more

dataLayer events seen gdprconsent, gtm.js, gtm.dom, gtm.load, gtm.click, gdprclosepopin, gtm.linkClick, gtm.timer

Where the data goes

Confirmed — a browser watched this site send measurement data to peugeot-g10-server-side-tagging-prod-406671236336.europe-west9.run.app, not to Google. observed on peugeot.fr More info »

Findings

Ordered by consequence. review has a concrete cost when it bites; info is real but depends on your setup. Seen is how common it is across the containers we have measured — reported separately on purpose, because common and harmless are different claims.

reviewWrites cookies directly (1)

1 piece of custom code set cookies in code.

WhyCookies set this way bypass GTM's consent settings, because the consent checks live in the tag templates rather than in raw JavaScript.

CheckIf any of these cookies are used for analytics or advertising, confirm they are still gated on a consent decision.

Seenseen in 21.2% of 46,522 containers measured

infoUses browser storage (4)

4 pieces of custom code read or write localStorage or sessionStorage.

WhyBrowser storage persists across visits and is not covered by cookie consent tooling, so it is easy to overlook when auditing what you keep on a visitor's device.

CheckConfirm nothing personal is being kept there, and that it is covered by your privacy notice.

Seenseen in 23.3% of 46,522 containers measured

infoConsent configuration detected (2)

The container declares one or more consent signals.

WhyConsent handling is present in the container. This describes what the artifact declares; what actually happened on the page is measured separately, above.

CheckConfirm these settings match the consent policy you intend to enforce, and compare them with the before-and-after observation.

Seenseen in 44.6% of 46,522 containers measured

Third parties it can reach

Each host is a party that can execute code or receive data in a visitor's browser. Follow one to see who else loads it. More info »

www.google-analytics.com ×45

Detected on

Sites observed loading this container. A container used across many hosts is a shared template; one on a single host is a bespoke build. Follow a site to see every container it loads.

peugeot.com.br stellantisandyou.com vauxhall.co.uk opel.de opel.com.tr opel.com citroen.com.tr peugeot.fr citroen.com peugeot.com

What this audit describes

Containers change. These findings describe one specific artifact, and you can re-fetch it to check this reading.

Container	`GTM-MRV29VWM`
Published version	`26` — the identity of this configuration. It changes only when someone publishes.
Read at	2026-08-22 10:07:01 UTC (a month ago)
Source	`https://www.googletagmanager.com/gtm.js?id=GTM-MRV29VWM`
Body checksum	`6dde115b3d8fffe287b8e01b2f30d77e749a58ccf5dd17d028329f9c6cbb6fad` Evidence of the exact bytes we read, not an identity: Google varies the response per request, so re-fetching an unchanged container yields a different checksum. Compare the published version instead.

Re-audit

This reading is from a month ago. A container can be republished at any time, and nothing here updates on its own — a fresh read is the only way to know whether it still says this. Running it again replaces this page in place, so the link keeps working.

Re-audit GTM-MRV29VWM

Check another container

Put this container under version control. Tagora exports it to a repository you own, so every change arrives as a pull request. How it works »