Liqui Moly 8931 Catalytic-System Cleaner
Protects the catalytic converter from clogging with soot. Cleans intake valves and the combustion chamber. Improves the combustion of the fuel. Clean engines reduce fuel consumption and therefore CO2 emissions. Prevents corrosion in the fuel system. Suitable for all gasoline engines with a catalytic converter.
Protects the catalytic converter from clogging with soot. Cleans intake valves and the combustion chamber. Improves the combustion of the fuel. Clean engines reduce fuel consumption and therefore CO2 emissions. Prevents corrosion in the fuel system. Suitable for all gasoline engines with a catalytic converter.
Protects the catalytic converter from clogging with soot. Cleans intake valves and the combustion chamber. Improves the combustion of the fuel. Clean engines reduce fuel consumption and therefore CO2 emissions. Prevents corrosion in the fuel system. Suitable for all gasoline engines with a catalytic converter.
Protects the catalytic converter from clogging with soot. Cleans intake valves and the combustion chamber. Improves the combustion of the fuel. Clean engines reduce fuel consumption and therefore CO2 emissions. Prevents corrosion in the fuel system. Suitable for all gasoline engines with a catalytic converter.
in 39 offers
The lowest price for Liqui Moly 8931 Catalytic-System Cleaner right now is $11.57 at Supermoist, compared across 7 retailers.
The all-time low was $9.54 on 16 Mar 2026 — today's price is 21% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 2 Nov 2026.
Last updated at 02/11/2026 11:21:21
Liqui Moly Catalytic System Cleaner (Spray into air intake)
Catalytic System Cleaner 300mL - LIQUI MOLY
Delivery between 4–12 Nov $7.37
LIQUI MOLY Catalytic System Cleaner 300ml 8931
Delivery $95.59
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Liqui Moly Catalytic System Cleaner 300ml
LIQUI MOLY 8931 Catalytic-System Cleaner
Delivery between 8–11 Nov $29
LIQUI MOLY 8931 Catalytic-System Cleaner
Delivery between 6–10 Nov $41
LIQUI MOLY 8931 Catalytic-System Cleaner
Free delivery between 11–13 Nov
originally posted on allegro.pl
Super
originally posted on ebay.com
This product seems to solve catalytic converters on high-mileage cars by restoring them to their full potential & factory specifications.
originally posted on ebay.com
We tried it and it didnt work check engine light is still on vehicle had to order a new converter
| Product Type | Catalytic System Cleaner |
| Engine Type | Gasoline engines |
| Compatible Fuel Type | Petrol |
| System Compatibility | Catalytic-system |
| Vehicle Type | Car |
Liqui Moly Catalytic System Cleaner (Spray into air intake)
Catalytic System Cleaner 300mL - LIQUI MOLY
Delivery between 4–12 Nov $7.37
LIQUI MOLY Catalytic System Cleaner 300ml 8931
Delivery $95.59
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Liqui Moly Catalytic System Cleaner 300ml
LIQUI MOLY 8931 Catalytic-System Cleaner
Delivery between 8–11 Nov $29
Super
This product seems to solve catalytic converters on high-mileage cars by restoring them to their full potential & factory specifications.
We tried it and it didnt work check engine light is still on vehicle had to order a new converter
Had a engine management light come on intermittently. Which Ive been told is either cat or 1 of 4 sensors. Seems ok early days fingers crossed
A good stuff for your car....clears your exhaust system
It just works. Halved the emissions.
Im very pleased with this product and noticed an engine performance increase in all 3 vehicles. I can highly recommend this product now that Ive used it.
The best product on the market
I don't usually rate additives. I had a P0420 - Catalyst System Efficiency Below Threshold (Bank 1).". When correctly sprayed in to the air intake on fast idle, this cleared up the problem after a fault reset. Previously the fault had been re-appearing within 50 miles - several hundred now and it's not come back.
good product
| Product Type | Catalytic System Cleaner |
| Engine Type | Gasoline engines |
| Compatible Fuel Type | Petrol |
| System Compatibility | Catalytic-system |
| Vehicle Type | Car |
