A catalytic converter is an exhaust conveying system that converts toxic gas coming from an internal combustion engine into a less harmful pollutant through a process called “redox reaction.”
It is usually used with internal combustion engines which use petrol or diesel as fuel and are often constructed to last a lifetime on the vehicle.
However, it could break down as a result of wear and tear, especially when there are cases of unattended repairs in other parts of the vehicle.
To avoid needless conditions and keep your car in perfect condition, knowing how to clean a catalytic converter is a skill you have to acquire. Discover steps on how to clean a catalytic converter, following various methods and materials to use.
To begin with, you can get the Catalytic converter in good condition by manually dismantling the converter from beneath the vehicle and washing it, i.e., after you must have deduced the sources of the converter’s fault, whether from it being clogged.
Meanwhile, if it is to clean the converter without any course to its removal, you can equally get this done.
When you start noticing a reduction in the release of black smoke from the exhaust system and quicker acceleration, then you have yourself a successfully clean operation, leaving your converter in good condition again.
What is a Catalytic Converter and Why does it Clogs?
A catalytic converter is an essential part of a car’s exhaust system. Its main job is to reduce harmful emissions by converting toxic gases from the engine into less harmful substances before they are released into the air.
This happens through two chemical processes: oxidation and reduction. Oxidation adds oxygen to harmful gases like carbon monoxide, turning it into carbon dioxide.
Reduction, on the other hand, removes oxygen from nitrogen oxides, breaking them down into harmless nitrogen and oxygen.
These processes take place inside the converter, which contains a honeycomb structure coated with metals like platinum, palladium, or rhodium that act as catalysts to speed up the reactions.
Over time, a catalytic converter can become clogged. This usually happens when unburned particles, such as oil or fuel, build up inside it.
Common causes include using contaminated fuel, engine oil leaks, or worn-out spark plugs that don’t burn fuel completely.
Excessive engine wear can also send more harmful particles into the exhaust, creating blockages. Additionally, short trips or frequent stop-and-go driving can prevent the converter from reaching the high temperatures needed to burn off contaminants.
Once clogged, the converter can restrict exhaust flow, leading to reduced engine performance.
What is a Catalytic Converter Cleaner?
Catalytic converters typically last about 100,000 miles before they may require replacement, but many can last longer. Unfortunately, these instruments can get clogged, and as a result, they might need to either be cleaned or replaced.
A catalytic converter or fuel system cleaner is typically a formula you can put into your fuel chamber that clears out carbon deposits in your catalytic converter and likely the rest of your fueling system — including fuel injectors.
The signs that it may be time to clean or replace your catalytic converter include heightened fuel consumption, dark exhaust smoke, and the smell of sulfur from your exhaust pipe.
Depending on how severe the clog or damage to your catalytic converter is, a fuel system or catalytic converter cleaner can help you improve this component’s function. There are a variety of options out there, and here are some picks that we recommend.
How To Clean A Catalytic Converter?
The catalytic converter is undeniably an essential part of a vehicle. It affects the performance of your vehicle and reduces tailpipe emissions.
Without an effective converter, your vehicle may start to suffer from slower acceleration, poor fuel efficiency, lack of power, and unpleasant odors. That is why it is important to clean your catalytic converter if it is underperforming due to an internal obstruction.
Because a catalytic converter is in charge of removing exhaust fumes, clogs may emerge over time. In addition to your vehicle exhibiting lackluster performance, your check engine light might turn on after the catalytic converter’s sensors register the issue.
We suggest you clean your catalytic converter as soon as you’re certain that’s the problem to avoid serious damage that may require a costly replacement.
One way to clean your clogged or dirty catalytic converter is through additives or cleaners. This method is perhaps the easiest because it doesn’t require much skill to complete. You will not need to remove anything but the gas cap on your filler neck.
You add the converter cleaner to your gas tank, and it then mixes with your fuel — there must be some fuel remaining, and the amount may differ depending on the cleaner of choice, so read and follow the instructions for the product you purchased.
Essentially, these cleaners contain detergents and solvents that remove contaminants and break down the buildup produced by the combustion process.
Which converter cleaner to use can depend on your specific engine, but there are various universal cleaners that work perfectly well with any gasoline engine, and some that are even OK to use on diesel engines.
We recommend you do some research to verify which converter cleaner is the right one for your vehicle.
Another way to clean your catalytic converter requires the removal of the part. This option obviously entails more time and mechanical expertise. You also run the risk of damaging the converter in the removal and reassembly process.
There are three options to try, though none is guaranteed to work:
#1. Soaking.
One method to try is submerging and soaking the catalytic converter in a soapy water solution. A dedicated oil or degreaser product will probably work best, though you might also try dish soap.
Add your cleaner to a sufficiently large bucket of water where the converter can fit. Submerge the converter into the bucket and let it sit overnight.
The next day, pull out the converter and ensure that the converter is free from any debris before letting it dry completely.
#2. Chemical cleaning.
For this method, try spraying a chemical cleaner (such as a carburetor cleaner) through the interior of the catalytic converter to remove the clogging deposits.
#3. Pressure washing.
You can also try using a pressure washer to spray water through the inside of the cat to remove stubborn deposits, but make sure that the pressure washer’s setting is at its lowest to avoid damage to the catalytic converter’s internal structure.
Remember that cleansing your catalytic converter might not be the answer to the problem. If the catalytic converter gods are not on your side, you might still end up needing a replacement.
How To Clean Catalytic Converter Best Method?
Method 1: Italian Tune-Up.
An Italian tune-up is the simplest and cheapest way to clean a catalytic converter because it costs nothing. The concept is straightforward: drive at high RPM on the highway to get the exhaust system hot enough to burn off light carbon or soot deposits.
Take your vehicle on a highway and accelerate hard, keeping the RPMs high (around 3,000-4,000 RPM) for about 15-20 minutes.
The sustained high temperature (often reaching over 1,100°F) helps burn away buildup inside the converter. This works best for light deposits caused by short trips or extended idling.
Make sure the engine is already at operating temperature before you start, and only do this if the vehicle is running reasonably well. Don’t attempt this method if the engine is misfiring, burning oil, or running rich, since that can overheat and damage the converter.
This method is hit or miss. If the clog is minor, you might notice improved performance and the check engine light may turn off after a few drive cycles.
If nothing changes after trying this a couple times, you’ll need to move on to other methods.
Cost: Free
Method 2: Catalytic Converter Cleaner Additive.
Fuel additives are designed to help clean the catalytic converter from the inside as you drive. Products like Cataclean, OxiCat, and Liqui Moly Catalytic System Cleaner are poured directly into your fuel tank and work their way through the fuel and exhaust systems.
The cleaner mixes with your fuel, passes through the combustion process, and reaches the catalytic converter as part of the exhaust flow.
The chemicals help reduce carbon and soot buildup and can improve exhaust flow if the clog is minor. For best results, add the cleaner when your tank is nearly empty, fill up with fresh fuel, and drive normally.
Most products recommend driving 50-150 miles to allow the cleaner to work through the system.
Highway driving helps because higher exhaust temperatures make the cleaning process more effective. You may need to repeat the treatment if the first bottle doesn’t fully resolve the issue.
This method works well for moderate carbon buildup but won’t fix physical damage or severe clogs. If you don’t see improvement after a couple treatments, cleaning probably won’t solve your problem and the catalytic converter will need to be replaced.
Cost: $15-$30 per bottle
Method 3: Removing and Soaking the Catalytic Converter.
This method requires more work but gives you the best chance of cleaning a moderately clogged converter. You’ll need to remove the converter from the exhaust system, soak it in a cleaning solution, and reinstall it once it’s completely dry.
- Let the exhaust system cool completely (it can stay hot for hours after driving). Raise the vehicle on jack stands.
- Spray penetrating oil on the bolts or clamps holding the catalytic converter. Exhaust hardware often rusts solid and needs time to loosen.
- Remove any oxygen sensors using an oxygen sensor socket. Then unbolt the converter from the exhaust pipes.
- Plug one end of the converter and fill it with degreaser or catalytic converter cleaning solution. A mix of hot water and dish detergent can also work for light buildup. Let it soak for several hours or overnight.
- Rinse thoroughly with a garden hose from both ends to flush out loosened debris. Avoid using a pressure washer unless it’s on a very low setting, as too much pressure can damage the converter’s ceramic honeycomb.
- Let the converter dry completely before reinstalling. Any water left inside will turn to steam and could crack the internal structure.
- Reinstall with new gaskets and tighten everything to proper torque specifications.
This method takes several hours and only makes sense if you’re comfortable working under a vehicle. On some cars, the converter is easy to access; on others, you may need to remove heat shields or additional exhaust components first.
Cost: $50-$100 (cleaning supplies, gaskets, possibly new hardware)
Method 4: Professional Cleaning.
Some shops offer professional catalytic converter cleaning services using ultrasonic cleaning equipment.
These methods use high-frequency sound waves in a cleaning solution to remove carbon and soot buildup from the honeycomb structure without disassembling or damaging it.
The shop will remove your catalytic converter and place it in an ultrasonic cleaning tank. The process usually takes a few hours, and the converter is reinstalled the same day.
This method is more thorough than anything you can do at home but still won’t fix physical damage to the internal structure.
Professional cleaning makes sense if you’ve tried additives or an Italian tune-up without success but don’t want to invest in a full replacement yet. It’s also a good option if you’re not comfortable removing the converter yourself.
Not all shops offer this service, so you may need to call around. Some exhaust shops and muffler specialists have the equipment, while others will need to send the converter out to a specialty cleaning facility.
Cost: $150-$400 depending on the shop and your location
Things to consider before starting
There are some things that you have to consider before trying to clean your catalytic converter. In a lot of cases, the parts inside the catalytic converter will become loose. If this is the case, you can’t repair your catalytic converter without removing and replacing it.
#1. Too clogged.
If your catalytic converter is so clogged that the engine will not run, you have to remove the catalytic converter and either use special tools or replace the whole catalytic converter.
#2. Check/listen for loose parts.
You can take a rubber hammer and hit your catalytic converter carefully and listen to ascertain if there seem to be any loose parts inside it.
If you can hear loose parts, I recommend removing and inspecting the catalytic converter because the loose parts could come even looser and completely clog your exhaust pipe, which may cause your vehicle to stop while driving.
#3. Purified catalyst.
Remember that your catalytic converter may have been cleaned inside, and the parts inside it may have blown out from the exhaust pipe.
This can be tough to see without removing it. If you suspect this is the case, you should remove the catalytic converter and check it.
#4. Oil consumption.
Your catalytic converter may have gotten clogged due to excessive internal oil consumption, caused by oil entering the cylinders and getting combusted and burned inside the hot catalytic converter.
If this is the case, you should always repair the internal oil leak before proceeding, as it may only work for a short time until the catalytic converter is clogged again.
Common symptoms of an internal oil leak are clogged crankcase ventilation, broken valve seals, or piston rings. Always check the crankcase ventilation first.
How To Clean Catalytic Converter?
#1. Without Removing it.
Step 1: Buy Oxicat Catalytic Converter Cleaner.
The easiest way to clean and rejuvenate a catalytic converter without taking it out is to use a catalytic converter cleaner product. We recommend OXICAT – Oxygen Sensor & Catalytic Converter Cleaner.
You can read more of these products in our article: Best Catalytic Converter Cleaners. You simply pour the product into your fuel tank, whether you drive gasoline, diesel or hybrid.
This will help clean the catalytic converter, and it will also clean your O2 sensors and the entire exhaust system, too.
Keep in mind, however, that the OXICAT Cleaner is not going to fix any mechanical problems with the catalytic converter if it is cracked, broken, or too clogged. Think of it as a cleaner for a slightly clogged catalytic converter that has lost its effectiveness due to aging.
Needless to say, you can use other brands of catalytic cleaner, but this has proven to be the most effective cleaner we have used.
Step 2: Pour the Catalytic converter cleaner into the fuel tank.
Check the manual for the cleaner and pour the correct amount of the cleaner into the fuel as directed by the manual.
Make sure you have the right amount for your car and engine so you are not adding too much of the product, as sometimes that can harm your catalytic converter even more.
Step 3: Take your car for a drive.
Allow your car to run a couple of miles after driving it, to see if it will run better than before. You can try driving the car at high RPM’s (over 3000 RPM’s) for a long distance to get the catalytic converter hot to burn out the clog inside it.
Just keep an eye on the coolant temperature so you do not over heat the car.
#2. After Removing It.
For more severe clogs, manual cleaning may be required. This method is more labor-intensive and often involves removing the catalytic converter from the vehicle. Here’s how to do it:
Step 1: Locate the Catalytic Converter.
The catalytic converter is part of your car’s exhaust system, typically located underneath the vehicle between the engine and the muffler. Depending on your car model, it may be easier or harder to access.
Step 2: Gather the Necessary Tools.
To safely remove and clean your catalytic converter, you’ll need:
- A wrench or socket set
- Protective gloves and goggles
- Penetrating oil
- Automotive degreaser or catalytic converter cleaner
- A large bucket for soaking
- A pressure washer (optional)
Step 3: Prepare the Vehicle.
Place your car on jack stands to elevate it safely. Ensure the car is on a flat, stable surface and never work underneath a vehicle supported solely by a jack.
Step 4: Remove the Catalytic Converter.
Loosen the flange bolts and disconnect the catalytic converter from the exhaust system. You may also need to remove oxygen sensors connected to the unit.
Step 5: Inspect the Converter.
Shake the catalytic converter gently and listen for loose parts or debris inside. If you hear rattling, the internal components may be damaged, and replacement might be necessary.
Step 6: Clean the Catalytic Converter.
- Pressure Wash: Spray the inside of the catalytic converter with a pressure washer to remove loose debris. Be cautious not to damage the internal honeycomb structure.
- Soak in Cleaner: Fill a bucket with warm water and an appropriate catalytic converter cleaner. Submerge the unit and let it soak for several hours to dissolve stubborn deposits.
Step 7: Dry and Reinstall.
Use compressed air or let the catalytic converter air dry completely before reinstalling it. Reattach the unit to the exhaust system and tighten all bolts securely. Reinstall the oxygen sensors if necessary.
Types of Professional Cleaning
There are generally two key approaches mechanics might take for cleaning a catalytic converter:
- On-Car Cleaning: This method involves cleaning the catalytic converter while it’s still attached to the vehicle. Specialized tools and chemical cleaning solutions are introduced through the exhaust system, removing built-up residue without disassembling any parts. This is often a faster, less expensive option.
- Off-Car Cleaning: For deeper cleanings, the mechanic may remove the catalytic converter entirely. Once off the car, ultrasonic cleaning equipment or immersion in chemical baths can be used to thoroughly restore the converter. This method is typically more intensive and reserved for severely clogged or malfunctioning converters.
Both methods rely on professional-grade tools and techniques that are much more effective than consumer-grade solutions or DIY attempts.
Cost of Professional Cleaning
The cost of professional catalytic converter cleaning can vary based on several factors, such as your vehicle’s make and model, the severity of the buildup, and your location.
On average, you can expect to pay anywhere between $200 and $800 for a thorough cleaning.
For smaller vehicles or mild clogging, costs may be on the lower end of the range, while luxury or high-performance cars may require specialized attention, driving up the price.
Additional charges may also apply if the mechanic identifies related issues that need to be addressed, such as faulty sensors or engine inefficiencies.
FAQs.
Q: Do Catalytic Converter Cleaning Sprays Work?
To keep various components in your vehicle clean, like the oxygen sensors, catalytic converter, the vehicle’s cylinder heads, and the injector for the fuel, you can use a proper cleaning solution, and they are sure to do the job.
An example of this is the Cataclean cleaning solution/liquid. Although there are several evaluation users tendered, notwithstanding, they are not enough to point out that these sprays are intense techniques on the said deal at best and snake oil at worst.
Affirmatively, the EPA has accepted the use of Cataclean, notwithstanding the option to discover the source of the problem.
Q: Does the Use of a Catalyst Converter Cleaner Make The Converter Clean?
The specially formulated catalytic converter cleaner solution that was poured into the fuel tank and then you’re good to go looked too extreme and could be doubted, but it worked.
If you want to know more details and accounts, there are many recommendations on the net, like YouTube, for example.
The catalytic converter cleaner will enable your car to have a smooth run and easily avoid any issues with emissions.
If you have a clogged catalytic converter, specifically from carbon, then replacing the catalytic converter is the best option… However, you can have a fine operation by getting it clean with a catalytic converter cleaner.
Q: Can I Pour a Converter Cleaner While Having a Full Tank?
The catalytic converter cleaner operates with the mixture of gasoline in the fuel tank to create a combination that can be cleaned when you start your engine and have a long-distance drive till you notice the changes.
Therefore it is vital that the quantity of the cleaner solution (Cataclean) to fuel is close to the prescribed volume when cleaning starts however, don’t make the mistake of pouring the Cataclean while having a full tank of gasoline. It will not yield good results.
Q: What Happens If You Don’t Fix a Catalytic Converter?
Since a malfunctioning catalytic converter won’t be able to regulate the toxic emissions from the engine, one of the symptoms of a bad catalytic converter is the increase in harmful pollution against the environment.
Also, one effect you will most likely come across is the smell of fume gases coming out from it. In particular, the exhaust gases will emit a sulfur odor.
Q: How Long Can I Drive With A Bad Catalytic Converter?
The risk of driving a car with a Malfunctioning catalytic converter can be taken, Just make sure to join one or two parts together with the catalytic converter then driving your car can be possible. Although, there will be a retarding operation with the Catalytic converter.
But there’d be an issue for those whose vehicles have their Catalytic Converter welded fully to the vehicle.
In some cases, it may merge directly or completely over time and requires you to have it changed as soon as possible.
Q: What Does Seafoam Fix?
You must have heard about seafoam and how to clean catalytic converters with it; however, seafoam enables large and sticky residues in the converter to dissolve or break down.
They are used for various engine parts as well. Because of its ability to clean tensions from a chain, cases of crankiness of gas or diesel oil, solenoid (VVT), and clear out the oil path.
Final Words
You may be asking what the whole point of cleaning the catalytic converter is or how to clean the Catalytic converter.
When can you just replace the catalytic converter? Yes, you can replace it, but after knowing you can save cost from the catalytic converter cleaning service with a smooth-running system, then cleaning the converter is worth the shot.
Knowing several ways how to clean a catalytic converter is an added advantage because it would help you maintain your vehicle shape and prevent unwanted havoc to your catalytic converter.