Wrinkly

having given thought to the above suggestion I am probably being very stupid but what I am having a problem understanding is that after the two Lambda Sensors (up and down stream) there are to the best of my knowledge no other Sensors in the exhaust. If that be the case then how does the "Efficiency Below Threshold" get read and eventually produce a code. The sensors being brand new are plainly working so where is the possibility of too much air being calculated from? Cheers, John

Criminal

Nichole Nothing showing on submission of what I am taking to be a video. Therefore cannot see what you are attempting to show us. Rain and S Type have caused problems with missing and rough running. I believe it filters off the channel around the bonnet and washes off the bulkhead. usually onto Bank 1. Not saying it is this because cannot see the important bit you are trying to show us. Regards and Good Luck, John.

Collar

Dog

Thanks for info. Just as a matter for consideration both upstream and downstream Lambda have had new fitted. I will get my son in lae to take the car to work where they have an MOT testing station and I am sure he can get the oxygen levels checked. Regards, John

Have had many submissions in this section about my 2005 S Type 2.5 Petrol, with many suggestions and quite a few new parts fitted. BUT still get that Code P0420 "Catalyst System Efficiency Below Threshold. Bank 1. Having reviewed the situation and the actions that have been taken, I then came upon an article which may/may not be relevant and would appreciate comments and or suggestions from those who are well informed and have given advice on the matter previously. Part of my "reviewing the situation" (any of you from the era when that phrase was used in a hit song), was that the article I found this week referred to misfire can cause severe damage to the Catalytic Converter. This interests me on the basis that just prior to P0420 raising its "ugly head", I had an incident where the car went into restricted mode due to a misfire on No3 Cylinder. This is of course in Bank 1 where the P0420 code is reported. At the time all Six Plugs (Denso) were renewed along with Six Coil Packs (expensive) and all Six Inlet Manifold Gaskets (Jaguar genuine) were also replaced. The car was also fully serviced (and I mean fully, all oils, filters etc etc were replaced that was at 62000 miles approx.). The car has done about 1000 miles since then and repeatedly throws this P0420 Code. If reset it will run for about 18 - 20 miles before showing in again. What is annoying is that the car does not present any of the usual signs of Cat failure, I.E. smelly exhaust, misfire, high fuel usage (mpg), lack of power etc, etc. "It just runs as sweet as a nut", thankfully. I am of an age and being that a yellow engine warning light really "chesses me off big time", and I need to cure it. I have been reluctant to replace the Catalytic Converter on Bank 1, due to their cost if you buy recognised parts and I do not ever by cheap replacement parts, because I do not consider them cheap in the long run. However having read the recent article suggesting that a misfire will "Kill the Cat" I am beginning to think it might be the best route to go. I am therefore seeking views/opinions/thoughts either for or against taking this action of replacing the Cat. The other question is do I replace the one Cat, or do I "bite the bullet" and have both of them replaced. Many thanks for you considerations/advice/views/suggestions. Regards and Best Wishes, John

Satisfied

Crisps

Tor

Somerset

Shoemaker

Try this link: https://www.check-mot.service.gov.uk/?_ga=2.164926079.1970067029.1616952539-343505647.1611066239. Good luck and Best Wishes, Regards, John

thrashing

Square

up

Back

Dome

Auditorium

Narrator

Actor

Mick, That`s about right. Good Luck, John

Tim

Mick I tried many things, all of which did not work. This worked well and first time. Do follow the instructions to the full and be patient. I have a feeling if you start taking short cuts it is not going to work. I spent about 2.5 hours on each pair of lights and ended up with what I consider to be "looking like new" lamps. Good Luck. John

Miniscule