Wasted ad spend on Google Ads rarely comes from bad targeting settings. It usually comes from the absence of negative keywords, letting your ads show for searches that were never going to convert. This is a practical starting list for dealerships, along with how to keep building on it.
Categories of searches that waste dealership ad spend
A few recurring categories account for most of the wasted spend we see in dealership accounts:
- Spare parts and accessories searches, when your ads are promoting vehicle sales, not parts
- Job and career searches, since 'dealership' and brand names appear frequently in job-search queries
- Repair and service searches, if your campaign is specifically for sales rather than your service department
- Comparison and review research from people clearly in early research rather than ready to enquire, like 'is [model] reliable' or 'problems with [model]'
- Rental and used-for-hire searches, which share vocabulary with sales searches but represent entirely different intent
Building your negative keyword list from actual search terms
The starting categories above are a baseline, not a complete list. The real work is reviewing your account's Search Terms report regularly and adding negative keywords based on what's actually triggering your ads, since every dealership's wasted spend pattern looks slightly different depending on model names and local search behavior.
Negative keywords at the right level
Apply broad negatives, like job-search or repair-search terms, at the account or campaign level so they protect every campaign at once. Apply narrower negatives, specific to one model's confusing search overlap, at the ad group level so they don't accidentally block a different campaign where that term is actually relevant.
A recurring review habit beats a one-time list
New irrelevant search terms appear over time as language and search behavior shift. A monthly review of the Search Terms report, adding new negatives as patterns emerge, keeps wasted spend from creeping back in rather than treating negative keywords as a one-time setup task.
Don't over-negate and cut off real buyers
It's possible to be too aggressive with negative keywords and accidentally block genuine buyer searches, especially broad match negatives added without checking their full impact. Review the estimated reach impact before adding a broad negative, and periodically audit whether a negative keyword might be excluding legitimate enquiries.