TLDR Review: Cataclean Engine and Fuel System Cleaner
Verdict
Cataclean 120007 is a popular and cost-effective solution for addressing catalytic converter-related check engine lights and performance issues. It might require multiple applications for optimal results, especially in high-mileage vehicles. While it offers a handy alternative to costly repairs, its effectiveness can vary based on the severity of the catalytic converter's condition. If persistent issues persist, professional inspection or repair might be necessary. Keep an eye out for better pricing at competing retailers to ensure you're getting the best deal.
- Top pro:
- Effectively resolved a check engine light issue related to the catalytic converter.
- Top con:
- Required a second application for full effectiveness in some cases.
Pros
- •Effectively resolved a check engine light issue related to the catalytic converter.
- •Successfully cleaned a dirty catalytic converter, leading to noticeable improvement.
- •Resulted in significant savings compared to dealership repairs.
- •Clear instructions made application easy; just pour into the gas tank when nearly empty.
- •Improvement in car performance after using the product.
- •Considered a cost-effective alternative to expensive dealership repairs.
- •Helped to pass emissions test despite not fixing the underlying issue.
- •Check engine light turned off two days post-application, indicating effectiveness.
- •Noticeably improved engine performance even in high mileage vehicles.
- •Successfully resolved code P0420 for some users.
Cons
- •Required a second application for full effectiveness in some cases.
- •Some users experienced only temporary relief from the check engine light.
- •Mixed results after following usage instructions; not universally effective.
- •Did not resolve the P0420 code issue for all users.
- •Reviewer noted the product is cheaper at a competitor store.
- •Effect was minimal for NOX level reduction for some users.
- •Effectiveness may vary depending on the condition of the catalytic converter.
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How we researched this
About this review: it summarizes the professional reviews and customer ratings ShopSavvy collected for this product, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Oct 12, 2026.
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