EZ PASS Emissions Treatment catalytic converter & O2 sensor cleaner — 16 fl oz concentrate, smog test prep

EZ PASS™ Emissions Treatment is a one-step gasoline additive designed to help clean the catalytic converter, oxygen sensors, combustion chamber, and fuel injectors when added to a full tank and driven at highway speed.

This concentrated 16 fl. oz. bottle is formulated to circulate through the fuel and exhaust systems during normal driving, helping to address carbon buildup and deposits that can affect emissions readings and engine smoothness. It’s intended as a preparatory step before state smog inspections or as routine maintenance to support long-term emissions system efficiency; results depend on vehicle condition and it won’t repair physically damaged parts.

How does EZ PASS™ work to help before a smog or emissions test?

The formula disperses with the gasoline and travels through the combustion process, where detergents and solvents work to loosen and remove carbon and fouling on injectors, valves, and sensor surfaces. As deposits are reduced, oxygen sensor feedback and catalytic converter flow can improve, which may lower certain emissions readings. Consistent use can help maintain cleaner system operation between service intervals.

• Pour one 16 fl. oz. bottle into a full tank (treats up to 16 gallons).
• Drive 10–15 minutes at highway speed with the engine fully warmed to allow circulation.
• Use every 2,000 miles for routine maintenance to help sustain effects.

Will this restore a failing catalytic converter or a bad O2 sensor?

The additive is designed to reduce carbon and varnish buildup that can impair sensor readings and catalyst efficiency, but it cannot mechanically repair or replace damaged components. If the catalytic converter has physical failure, melting, or irreparable clogging, professional diagnostics and replacement may be necessary. Use this product as a preventive or preparatory treatment rather than a guaranteed repair.

• Helps with buildup-related performance problems, not physical damage.
• May assist in clearing deposits that trigger some OBD emissions codes.
• If problems persist, consult a technician for inspection or replacement.

How do I use EZ PASS™ and how often should I treat my vehicle?

Emptying the bottle into a full tank maximizes dilution and distribution; then drive at highway speeds for at least 10–15 minutes once the engine is at operating temperature so the product can move through the exhaust and catalyst. For maintenance, add the treatment every 2,000 miles to help keep injectors and sensors cleaner over time. Avoid using the bottle in diesel engines—this product is formulated for gasoline-powered vehicles only.

• Pour into a full gasoline tank (treats up to 16 gallons).
• Drive 10–15 minutes at highway speed with warm engine for best circulation.
• Repeat every 2,000 miles for ongoing maintenance.

What improvements can I reasonably expect after using this product?

Improvements depend on vehicle age, prior maintenance, and the severity of deposits. Typical outcomes include cleaner injector spray patterns, reduced carbon accumulation in combustion areas, and more stable oxygen sensor signals, which can lead to smoother idle and steadier running under load. Because every vehicle is different, measurable emissions reductions or cleared fault codes are possible but not guaranteed.

• Cleaner fuel injectors and combustion chambers for better combustion.
• Potential reduction in carbon-related exhaust restrictions.
• Support for oxygen sensor and catalyst function when deposits are the issue.

Who is this for: EZ PASS™ Emissions Treatment is aimed at drivers who want an easy, preventative step to help their gasoline vehicle’s emissions system perform better—especially before smog checks—or motorists seeking routine maintenance between shop services. It’s suited to vehicles showing mild deposit-related running issues or owners wanting to support long-term fuel system cleanliness; it is not a substitute for mechanical repair of damaged catalytic converters or sensors.