Kish pot “died”: how to diagnose and repair catalyst failure

If your car has a system Kia/Hyundai (often called "Kish") began to behave strangely - there was a metallic ringing under the bottom, power dropped or caught fire Check Engine with an error P0420, - most likely, the “pot” is to blame. That's what they call it in the car community catalytic converter (or its body), which fails over time. In this article, we'll look at why this happens, how to accurately diagnose the problem, and what to do next - from simple cleaning to complete replacement.

It is important to understand: the “death” of a Kish pot rarely happens suddenly. This is usually the result of years of prolonged neglect of symptoms - e.g. missed maintenance to replace the lambda probe or use of low-quality gasoline with high sulfur content. We have collected current data on models Kia Ceed, Hyundai Solaris, Kia Rio and other popular cars where this problem occurs most often.

What is a “Kish pot” and why is it “dying”

By “potty,” car owners mean metal catalyst housing, inside of which there are ceramic or metal honeycombs coated with precious metals (platinum, palladium, rhodium). Their task is to burn harmful substances in the exhaust gases (CO, CH, NOx) to harmless CO₂ and H₂O. Over time, the cells become clogged, melted or destroyed, which leads to the “death” of the device.

Main causes of failure:

• 🔥 Overheating - due to faulty spark plugs, a rich fuel mixture or ignition problems, the temperature in the catalyst exceeds 1000°C, and the honeycomb is sintered.
• 🛢️ Bad fuel - gasoline with additives or high sulfur content accelerates corrosion and clogging of honeycombs.
• 🚗 Mechanical damage — impacts with curbs or off-road driving can crack the body or dislodge internal elements.
• ⚡ Electrical problems — a faulty lambda probe (oxygen sensor) gives incorrect signals to the ECU, which leads to improper operation of the catalyst.

By car Kia/Hyundai with engines Gamma (1.4/1.6 l) and Nu (2.0 l) “pot” often fails after 150–200 thousand kilometers. But if you drive aggressively or use counterfeit parts, this can happen earlier.

Signs of “death” of a Kish pot: how to recognize the problem

The exhaust system does not break down instantly; it is usually preceded by characteristic symptoms. Here are the key signs that the catalytic converter is damaged Kia/Hyundai something is wrong:

Symptom	Probable Cause	Urgency of repair
Lights up Check Engine with an error P0420 (“low catalyst efficiency”)	The honeycombs are clogged or destroyed, the lambda probe detects deviations in the exhaust composition	⚠️ Medium (you can drive, but fuel consumption will increase)
Metallic ringing under the bottom when driving over uneven surfaces	Destruction of ceramic honeycombs, their pieces hitting the walls of the housing	❗ High (risk of complete destruction and blocking of the exhaust)
Loss of power, dullness of the engine during acceleration	A clogged catalyst creates back pressure, the engine “suffocates”	❗ High (motor overheating is possible)
Increased fuel consumption (10–15%)	The ECU compensates for the “deaf” catalyst by enriching the mixture	⚠️ Average
Sulfur or rotten egg smell from exhaust pipe	Under-combustion of sulfur compounds due to destroyed honeycombs	⚠️ Average (harmful to health)

If you notice at least 2-3 symptoms from the table, it’s time to make a diagnosis. On Kia Ceed and Hyundai i30 with a mileage of 180 thousand km, the “death” of the pot is often disguised as problems with the fuel system, so it is important to exclude other faults.

⚠️ Attention: If a loud rattling noise is heard from under the car when starting a cold engine, this is a sure sign that the ceramics inside the catalyst have already crumbled. Further driving may result in debris entering the turbine (if equipped) or muffler.

How to check Kish catalyst: 3 working methods

Before you spend money on a replacement, make sure that the problem is in the “pot”. Here are three diagnostic methods that you can use yourself or in a service:

1. Visual inspection and tapping

Raise the car on a lift or drive it into a viewing hole. Inspect the catalyst body for:

• 🔍 Cracks or dents (a sign of mechanical damage).
• 🔥 Darkening or melting of metal (evidence of overheating).
• 🎯 Tap the body with a wooden stick - a dull sound indicates intact honeycombs, a rattling sound indicates destroyed ones.

2. Back pressure check

You will need a pressure gauge and an adapter to connect to the exhaust system (for example, instead of the first lambda probe). Normal pressure at idle speed is up to 0.3 kgf/cm². If the value is higher than 0.5 kgf/cm², the catalyst is clogged.

On Hyundai Solaris 1.6 often use a simplified method: unscrew the first oxygen sensor and start the engine. If the speed levels out and the power returns, the problem is a clogged catalyst.

3. Diagnostics with a scanner (ELM327 or professional)

Connect the scanner to the connector OBD-II and check:

• 📊 Lambda probe readings (before and after the catalyst). If the signals are almost identical, the cells are not working.
• 🚨 Presence of errors P0420, P0430 (low efficiency), P0130–P0167 (problems with oxygen sensors).

Disconnect the negative battery terminal for 10 minutes (error reset)

Check the integrity of the lambda probe wiring

Make sure there are no other engine faults (such as misfires)

Use fuel no lower than AI-95 for the test -->

If all three methods indicate a problem, it's time to think about repairs. By car Kia Sportage 3rd generation (2010–2016) there is often a problem with melting of honeycombs due to faulty nozzles - this requires an integrated approach.

What to do if the Kish pot “died”: repair options

Depending on the condition of the catalyst and your budget, there are several ways to solve the problem. Let's look at them from cheapest to most expensive, with the pros and cons of each.

1. Cleaning the catalyst (if the honeycomb is not destroyed)

Suitable only for clogged but intact honeycombs. Use special liquids (for example, Liqui Moly Katalysator-Reiniger) or an ultrasonic bath. Process:

1. Remove the catalyst from the car.
2. Soak in the solution for 10–12 hours.
3. Rinse with water under pressure (no more than 3 atm, so as not to damage the honeycombs).
4. Dry and install back.

Efficiency: up to 30–40% restoration of patency. On Kia Rio For the 3rd generation, this method helps for 10–15 thousand kilometers.

2. Installing a flame arrester instead of a catalyst

A radical but popular method is to cut out the catalyst and weld it in its place flame arrester (resonator with perforated pipe). Pros:

• ✅ Cheaper than replacement (from 3-5 thousand rubles for work + part).
• ✅ Exhaust passability improves, power increases slightly.
• ✅ Does not require reflashing the ECU (if you choose the right flame arrester).

Cons:

• ❌ The environmental class of the car is decreasing (problems with passing maintenance).
• ❌ An error may appear P0420, if you do not disable the second lambda probe programmatically.
• ❌ Exhaust noise increases.

What happens if you just knock out the catalyst?

If you remove the honeycomb from the housing without installing a flame arrester, the exhaust gases will flow unhindered, but:

1. A strong roar will appear (like a racing car).

2. The risk of the resonator or muffler melting due to high temperature will increase.

3. The ECU may go into emergency mode due to errors in the lambda probes.

This option is only suitable for a temporary solution (for example, until replacement).

3. Replacement with original catalyst

The most correct, but expensive way. The original "pot" for Hyundai Creta 1.6 will cost 30–50 thousand rubles, for Kia Sorento 2.4 - up to 80 thousand rubles. Benefits:

• ✅ Complete restoration of environmental friendliness and power.
• ✅ No problems with passing MOT.
• ✅ Manufacturer's warranty (usually 1-2 years).

Disadvantages:

• ❌ High cost (especially for diesel models).
• ❌ Risk of running into a fake (check for holograms and certificates).

4. Installation of a universal catalyst

A compromise option is to purchase a non-original catalyst from trusted brands (Bosal, Walker, Magnetti Marelli). Cost: 10–25 thousand rubles. It is important to choose a model with the same honeycomb volume and fit for your car.

How to extend the life of a Kish catalyst: prevention

Even if your “pot” is still alive, you should take care of its longevity in advance. Here are the key preventive measures:

• ⛽ Refuel at trusted gas stations - use fuel not lower than AI-95 (for turbocharged engines - AI-98). Avoid "noname" networks.
• 🔧 Monitor the ignition system - faulty spark plugs or coils lead to under-burning of fuel and overheating of the catalyst.
• 🚘 Avoid short trips — when driving on a cold engine (especially in winter), condensation accumulates in the catalyst, which corrodes the honeycombs.
• 🛑 Don't ignore mistakes Check Engine — even if the car drives normally, a problem with the lambda probe or injectors can kill the catalyst within 1–2 thousand km.
• 🔥 Don't overload the engine — prolonged driving at high speeds (for example, uphill) increases the temperature in the exhaust system.

By car Kia Optima with engine 2.4 GDI The catalyst often fails due to oil getting into the combustion chamber (problems with valve stem seals). Regularly checking the oil level and the condition of the turbine (if any) will help avoid costly repairs.

⚠️ Attention: If you are using gas equipment (GBO), the catalyst will last 1.5–2 times less due to the higher combustion temperature of propane-butane. In this case, it is recommended to check the condition of the exhaust system more often (every 30 thousand km).

How much does a repair cost: prices and where to do it?

The cost of work greatly depends on the car model, region and the chosen repair method. Below are approximate prices for popular models Kia/Hyundai (for 2026):

Car model	Cleaning the catalyst	Installing a flame arrester	Replacement with original	Replacement with station wagon
Kia Rio 1.4 (2015–2020)	1 500–2 500 ₽	3 000–5 000 ₽	25 000–35 000 ₽	8 000–12 000 ₽
Hyundai Solaris 1.6 (2017–2023)	2 000–3 000 ₽	4 000–6 000 ₽	30 000–40 000 ₽	10 000–15 000 ₽
Kia Sportage 2.0 (2010–2016)	2 500–3 500 ₽	5 000–8 000 ₽	40 000–55 000 ₽	15 000–20 000 ₽
Hyundai Tucson 1.6 T-GDI (2016–2022)	3 000–4 000 ₽	6 000–10 000 ₽	50 000–70 000 ₽	20 000–25 000 ₽

Prices include work, but do not include the cost of additional parts (gaskets, bolts, lambda probes). In Moscow services, prices are 15–20% higher than in the regions. There is no need to skimp on work - poor-quality welding or incorrect installation of the flame arrester can lead to exhaust gases leaking into the cabin.

Where is the best place to repair:

• 🔧 Official dealer - warranty, but high price (recommended for new cars under warranty).
• 🔧 Specialized service for exhaust systems — the best option in terms of price/quality ratio.
• 🔧 Garage craftsmen - cheaper, but there is a risk of running into poor-quality work (check reviews).

Legal nuances: is it possible to drive without a catalyst?

From a legal perspective, removing or replacing a catalytic converter with a flame retardant is a gray area. Here's what Russian legislation says in 2026:

• 📜 Technical regulations of the Customs Union (TR TS 018/2011) requires that the car meets the environmental class specified in the PTS. For most Kia/Hyundai after 2010 it is Euro 4 or Euro 5.
• 🚔 Passing a technical inspection — without a catalyst or with a flame arrester, it is more difficult to pass maintenance, but it is possible. Some stations close their eyes if there is no visual damage (for example, on Hyundai Accent until 2010).
• 💰 Fines — there is no direct punishment for the lack of a catalyst, but the inspector may fine for malfunction in which operation is prohibited (Article 12.5 of the Administrative Code, fine 500 ₽).

In practice:

• Cars older than 10 years (for example, Kia Spectra 2008) often undergo maintenance even with the catalyst removed.
• For new cars (after 2016) it is better to set universal catalyst with a certificate to avoid problems.
• In some regions (Moscow, St. Petersburg) control is stricter - they can check the exhaust with a gas analyzer.

If you are planning to sell your car, a missing catalytic converter could be a problem - many buyers check this with a diagnostic scanner.

FAQ: Frequently asked questions about the “death” of the Kish pot

Is it possible to drive with a damaged catalytic converter?

Technically yes, but it is fraught:

• Risk of ceramic fragments getting into the cylinders (if the catalyst is in front of the turbine).
• Increased fuel consumption by 10–20%.
• Increased wear of the muffler due to high exhaust temperatures.

On Kia Soul 1.6 owners drive without a catalyst for years, but this reduces engine life.

How to fool the lambda probe after removing the catalyst?

There are three ways:

1. Mechanical snag — a mini-catalyst or ceramic insert is welded in front of the second sensor (cost 1,500–3,000 rubles).
2. Electronic snag — a signal emulator that “tells” the ECU that the catalyst is working (price 2,000–5,000 rubles).
3. Flashing the ECU — disabling control of the second lambda probe (from RUB 3,000, but there is a risk of firmware failure).

On Hyundai Elantra 1.6 engines often use mechanical decoys - they are more reliable and do not affect the operation of the engine.

How long does a catalyst last on a Kia/Hyundai?

The lifespan depends on the operating conditions:

• City driving (frequent short trips) — 100–150 thousand km.
• Route (long trips) — 180–250 thousand km.
• Gas equipment (GBO) — 80–120 thousand km.

On Kia Cerato 2013–2018 catalysts often “die” by 160 thousand km due to problems with the injection system.

Is it possible to restore a melted catalyst?

No. If the honeycombs are sintered or destroyed, they cannot be restored. The only option is to replace it with a new one or install a flame arrester. Attempts to “weld” the case or clean the melted honeycomb will lead to even greater problems.

Which flame arrester is better to install on Hyundai Solaris?

For Solaris 1.4/1.6 fit:

• MG-Race - a budget option (from 2,500 ₽), but may require modifications to the landing.
• Fox — optimal price/quality ratio (4,000–5,000 rubles).
• Sprint — premium segment (from 7,000 ₽), with a 2-year guarantee.

Important: choose a model with internal perforationto reduce noise.