Well you should look for any leaks intake or exhaust. If the fault is permanent you might want to check wires before changing o2 sensor.

Finale

Many thanks for the comments I received, it gave me some food for thought.

Took car back to Honda, the code was reset so check engine light was cleared. It was inferred the CATCLEAN may have not helped the situation even though I told them it had been added after the previous visit to Honda when the check engine light re-appeared,.hoping it would do the trick.

Further investigation they discovered the engine was mis-firing due to badly worn spark plugs and this may have been the cause of the problem. My only gripe with Honda, because I only had a basic service package, unknowingly until I took it to a Honda garage for its first service,I bought the car second hand, I am not sure how I was suppose to know they needed changing after 75000 miles, without at least being advised........ Perhaps I am wrong, but I feel they should have been checked after so many miles even if they weren't included in the basic package Once upon a time with my other cars spark plugs were checked at every service.

At least for the moment the car is running really well.........................................until the next time ......

Edited by tig1 on 20/07/2019 at 22:51

Service book states 75000 miles, a lot of mileage eh, and obviously they were not checked then. Very remiss. OK so I wasn't aware, but I hand my car over to Honda at some expense for them to service and care with their expert technicians. I know better now.

Long Life Plugs are are around £30 EACH - so obviously not in a basic service package