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.

Arrived as described - works well.

It done the job

This was really easy to use and did improve car performance.

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!

All good so far

Good!

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.