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Understand what this lesson solves

Basic full lesson

Diagnose a Google Ads performance drop by reconciling tracking, orders, search terms, change history, and Merchant Center before changing bids.

Diagnose the layer holding performance back, then improve search terms, bidding, budgets, landing pages, PMax, feeds, and value signals without giving up profit control.

Lesson outline

1Write the break window
2Open Google Ads Change history
3Reconcile GA4 / Shopify order evidence
4Check Search terms and source mix
5Check Feed, page, and profit counter-evidence
6Choose one primary problem layer
7Choose one single-variable action and review window
8Copy the diagnostic notes and schedule review

Public core framework

Record date, campaign, device, market, query or SKU, and the CPA, ROAS, CVR, conversion value, or checkout-to-purchase change. Do not write only “performance got worse.”
Record same-week budget, target CPA / target ROAS, bid strategy, keyword, negative, conversion action, bulk edit, and auto-applied recommendation changes. Put change date, changed by, and campaign into the diagnostic sheet.

Sources and review

Last checked: 2026-10-05

support.google.comhttps://support.google.com/google-ads/answer/10279006?hl=en
support.google.comhttps://support.google.com/google-ads/answer/19888?hl=en
support.google.comhttps://support.google.com/google-ads/answer/9061546?hl=en
support.google.comhttps://support.google.com/google-ads/answer/9061547?hl=en
support.google.comhttps://support.google.com/google-ads/answer/2472708?hl=en
support.google.comhttps://support.google.com/google-ads/answer/7478529?hl=en
support.google.comhttps://support.google.com/google-ads/answer/2453972?hl=en
support.google.comhttps://support.google.com/google-ads/answer/15726455?hl=en
support.google.comhttps://support.google.com/google-ads/answer/16669487?hl=en
support.google.comhttps://support.google.com/google-ads/answer/16672776?hl=en
support.google.comhttps://support.google.com/google-ads/answer/6268632?hl=en
support.google.comhttps://support.google.com/google-ads/answer/6268637?hl=en
support.google.comhttps://support.google.com/google-ads/answer/7074566?hl=en
support.google.comhttps://support.google.com/google-ads/answer/10683687?hl=en
support.google.comhttps://support.google.com/merchants/answer/12488713?hl=en
support.google.comhttps://support.google.com/google-ads/answer/13455130?hl=en

Applies to: This preview is for the lesson's public problem, structure, and operating boundary. Verify current platform, account, and business facts separately.

Limitations: The preview is a bounded summary and excludes member text, personalized interaction data, and full case derivations; recheck source pages before acting.

Reviewed by: Ranfeng Wei · Next review: 2027-01-03

Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source
Public facts and operating boundaries in this preview→source

Google Ads Diagnostics: Find the Problem Layer First

Understand what this lesson solves

Lesson outline

Public core framework

Sources and review

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