johnlwatts

How many turns to remove it. I’m having the same problem. I can get the lid past the click then it gets very tight.

I tried Cataclean but it did not help I ended up having a new catalytic convertor at about 50,000 miles. As part of the process I moved away from servicing at my main dealer as they tried to scam me by reporting two non existent problems for attention. The dealership is now closed. I am now with a trusted local garage where I have received first class service. Whilst changing the Cat my new garage found some strange error codes/settings which they dealt with via specialist support. The car now runs like a dream.

Thanks for the info. That's very useful to understand the configuration. The reason for me asking is that I have just had the Catalytic Convertor changed as it was faulty. The cars performance is now much better. Two days on from leaving the garage the dreaded P0240 code (Catalyst System Efficiency below threshold (bank 1)) reappeared. Both the oxygen sensors have been replaced in the past year also. The car is going back into the garage next week for further investigation. To help me get to the bottom of this do you have any suggestions as to what to look at next.

Does the Octavia MkIII 1.8TSI petrol have an EGR valve. If so where is it located on the engine?

I have a 2016 Octavia MkIII 1.8T petrol car. I am getting repeated P0420 Catalyst System, Bank 1, Efficiency below threshold and 14916 rough Idle fault codes. The fault seems to occur when the lifting the foot off the throttle when going downhill at 30-40 mph. (engine overrun). Its hard to be precise as I can't drive and watch the engine management light at the same time. I reset the fault codes using Carista and log the details. Both oxygen sensors have been replaced recently after the garage has had two attempts at diagnosis. The performance and economy of the vehicle does not seem to be affected. Is it worth trying Cataclean? Can anyone offer any advice please. Thanks John Watts