Emissions System Cleaner
Representative Photo, actual item may vary
Representative Photo, actual item may vary
Every combustion cycle leaves something behind. Carbon, soot, varnish and fuel by-products gradually collect along the intake, exhaust gas recirculation (EGR) passages, oxygen sensors and catalytic converter. An emissions system cleaner is a chemical treatment designed to dissolve those deposits so the engine and its pollution-control hardware can work as intended, often without taking anything apart.
Why Emissions System Cleaners Matter
Modern vehicles depend on a tightly coordinated set of components to keep exhaust output low. The EGR valve routes a portion of exhaust back into the intake to lower combustion temperatures. Oxygen sensors report exhaust composition to the engine computer. The catalytic converter then converts harmful gases into less harmful ones. When any of these parts become coated with deposits, symptoms can include rough idle, hesitation, reduced fuel economy, stored trouble codes and a failed emissions inspection.
Cleaning is a sensible first step in many of these cases, particularly when the problem stems from buildup rather than a failed part. It can also serve as routine preventive maintenance, especially on high-mileage engines, vehicles that mostly see short trips, and diesels that spend a lot of time at low load.
Types of Emissions Cleaners
- EGR circuit cleaners: Target carbon and soot in EGR valves, passages and intakes, and are typically aimed at diesel engines where EGR deposits are a common concern.
- Fuel, exhaust and catalyst cleaners: Poured into the fuel tank, these treat the fuel system and exhaust path together, aiming to reduce catalyst contamination and clean oxygen sensor tips.
- Diesel-specific emissions cleaners: Formulated for particulate filter, DEF and SCR-related components found on newer diesels.
What to Consider When Shopping
- Engine type: Confirm whether the formula is intended for gasoline, diesel or both. Some products are built specifically for diesel EGR systems, while others work with gasoline, ethanol blends and hybrids.
- Application method: Some cleaners are added to the fuel tank, while others are designed for use with a dedicated cleaning tool or service equipment.
- Symptom match: Choose a cleaner aimed at your issue, whether that is EGR buildup, a sluggish catalytic converter or general exhaust system upkeep.
- Realistic expectations: Cleaners dissolve deposits, but they cannot repair a physically failed sensor, a damaged converter or a mechanical fault.
Brands to Know
UView is the brand behind the MotorVac line of professional service chemicals. Its DieselTune EGR System Cleaner is built to clean the EGR circuit and remove stubborn carbon deposits, and it is intended to work with the brand's EGR cleaning tool as an alternative to tearing down the system.
Bar's Products is a family-owned Michigan manufacturer founded in 1947, best known for Bar's Leaks stop-leak products and the Rislone line of engine and fuel treatments. Its Rislone Cat Complete Fuel, Exhaust and Emissions System Cleaner is formulated to clean the fuel and exhaust system, help restore catalytic converter function and clean oxygen sensor tips, and it works with gasoline, ethanol and hybrid vehicles.
Using Cleaners as Part of a Maintenance Plan
Emissions cleaners work best alongside good maintenance habits: quality fuel, on-time oil changes, fresh air filters and prompt attention to check engine lights. Always follow the label directions for dosage and application, and pair chemical cleaning with proper diagnosis so you treat the actual cause of the problem.