There’s nothing more annoying than a P0420 check engine code. There are a lot of things that can cause it, but LIQUI MOLY’s Catalytic System Care is an additive that can help prevent it from coming on.
At SEMA 2026, LIQUI MOLY brought out its Catalytic System Care, a product that is geared toward any DIY car owner. Don’t let the name fool you: Catalytic System Care doesn’t actually clean your catalytic converter. It’s a fuel system treatment that cleans your injectors. By doing this, it helps your vehicle’s oxygen sensor receive the correct data and helps ensure the air-fuel ratio information is correct.
Steffen Niemietz from LIQUI MOLY explains which vehicles benefit the most from the Catalytic System Care product:
“We really did our homework on who this product is geared towards. Older cars or high-mileage cars will typically have issues with the P0420 check engine code. Owners of these cars that do their own mechanical work can use Catalytic System Care to try and address the issue before they take the car to a shop.”
Catalytic System Care was developed by LIQUI MOLY using the newest chemical platform available. It was lab-tested to measure how well it worked during system cleanup, and according to Niemietz, it outperformed the company’s previous products.
You can learn more about LIQUI MOLY’s Catalytic System Care right here on the company’s website.
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