Meta to Transition to Comscore Markets for Automotive Model Advertising

Beginning June 22, 2026, Nielsen’s Designated Market Area (DMA) will no longer be used for automotive model ads, replaced by Comscore Markets®, introduced in August 2025. Campaigns still using Nielsen’s DMA after this date will be paused and must update to Comscore Markets® to resume.

Transition Details and Timeline

• Starting March 23, 2026: Advertisers can update their vehicle offer feeds to replace the dma_codes column with Comscore Market IDs. Facebook provides a mapping table to convert existing dma_codes to Comscore Market IDs. Advertisers must validate the feed to ensure correct mapping and proper formatting (as an array of strings), then upload via Catalog Manager or Marketing API. Monitoring of vehicle offers is advised to confirm accurate regional targeting.

• April 20, 2026: A notification will appear during feed ingestion if dma_codes are still present in the vehicle offer feed for Catalog Ads.

• June 22, 2026: Nielsen’s DMAs will be fully removed from all Meta targeting and reporting tools. Campaigns using dma_codes will stop delivering and require updating to Comscore Market IDs before restarting.

Example of Feed Update

CSV Format:

vehicle_offer_id,make,model,year,offer_type,title,comscore_market_codes
offer123,Toyota,Camry,2024,lease,$299/month lease,"[\"2001\",\"2004\",\"2025\"]"

XML Format:

<listing>
  <vehicle_offer_id>offer123</vehicle_offer_id>
  <make>Toyota</make>
  <model>Camry</model>
  <year>2024</year>
  <offer_type>lease</offer_type>
  <title>$299/month lease on 2024 Toyota Camry</title>
  <comscore_market_codes>2001,2004,2025</comscore_market_codes>
</listing>

API Format:

{
  "vehicle_offer_id": "offer123",
  "make": "Foo",
  "model": "Bar",
  "year": 2024,
  "offer_type": "lease",
  "title": "$299/month lease on 2024 Foo Bar",
  "comscore_market_codes": ["2001", "2004", "2025"]
}

This change aims to provide a more sustainable and scalable solution for long-term performance and measurement in automotive advertising.