Wynn's Catalytic Converter & Lambda Sensor Cleaner - Optimises Efficiency, Reduces Emissions & Restores Engine Performance - Ideal for Petrol & Hybrid Engines - 325ml

I was sceptical at first as I've used other fuel injector cleaners like Redex and Carlube before without really noticing any improvement. I recently had my car fail it's emissions test, as there was a rich fuel condition with the fuel trims which was messing with the catalyst. I used Wynns (added a more concentrated mix in the fuel tank) and within 20mins of driving I noticed an immediate difference. I checked the fuel trims and they had balanced out back to normal. Petrol economy has been brilliant since using this as the usual amount of petrol lasts almost another half a week longer. Will use this again every 3 months. Brilliant item.

All good so far

It done the job

My Citroen Cactus C4 was having the errors P0369 and P0366 on the ODB. Plus, the car was juddering and having some hesitations. What I have done. Added this product into 20l of petrol and also I have cleaned the O2 sensors with carburettor cleaner. Both sensors were fully carbonized and black. Within 3 days, car came back to Normal with no errors on the dashboard. What I have done now is ordered another one, to make sure the catalytic converter is fully clean and I will use this product every year.

Bought this again as worked well first time but engine light has come back on again, trying again as dirty cat may be more serious!

After having my engine management light come on and a visit to the garage I was informed the the o2 sensor wasn't working properly and the fitter suggested I try a cleaner, so I purchased 2 of this product and used one and on topping up the tank used the other one and the engine light has been reset and hasn't come back.

Good!

Not sure if this works or not to be honest but was worth a try, my issues was to do with a setting but it was worth a go I guess