Jump to content


P0420 Code Reading. Catalyst Efficiency.


Wrinkly
 Share

Recommended Posts

Have posted before on this subject but am now at a loss as to what to do to correct.

History of attempting to correct: Car was MOT`d April this year and had nothing needing attention and no points for attention. So, plainly must have had correct/acceptable emissions at that stage. Has done exactly 1845 miles since MOT. Car was serviced and I mean full service 1494 miles ago. 800 miles ago the Ignition Coils 6, spark plugs 6, Inlet Manifold Gaskets 6, were replaced because of a faulty Ignition Coil on Cylinder No: 3. Less than 300 miles ago Yellow Engine Management Light appeared. OBD11 code Reading P0420 Catalyst System Efficiency Below Threshold. Bank 1. (Left Bank when stood looking at engine from front of car. Correct I believe ?????). 

Upon advice the Lambda Sensor Upstream was replaced (Denso as OE.). after only 20 miles the same fault kicked in again. The Lambda Sensor Downstream (again Denso as OE) was then replaced. After18 miles today the same fault has appeared I.E P0420, as above.

1/ Would appreciate advice on what to do next to correct this fault.

2/ Has anyone any experience of using branded Catalyst Cleaners that are put in the fuel tank and run through the system. The advertising for them, as one would expect, is full of praise and "a cure all". Is it worth trying for the sake of £20. Will they cause any harm or damage. 

3/ Do you believe I am really looking at the costly action of buying replacement Catalytic Converter/s which seem to be in the region of £155.00 each.

4/ Due to travel to Cornwall in two weeks and would like to correct this before the weekend away.

5/ Will it do any damage to run the car with this fault not corrected and the Yellow Management light continuing to show.

In anticipation of receiving some advice on above questions I would thank you in advance for your time and efforts on this problem

Best Wishes and Regards, John

Link to comment
Share on other sites


23 hours ago, Wrinkly said:

Have posted before on this subject but am now at a loss as to what to do to correct.

History of attempting to correct: Car was MOT`d April this year and had nothing needing attention and no points for attention. So, plainly must have had correct/acceptable emissions at that stage. Has done exactly 1845 miles since MOT. Car was serviced and I mean full service 1494 miles ago. 800 miles ago the Ignition Coils 6, Spark Plugs 6, Inlet Manifold Gaskets 6, were replaced because of a faulty Ignition Coil on Cylinder No: 3. Less than 300 miles ago Yellow Engine Management Light appeared. OBD11 code Reading P0420 Catalyst System Efficiency Below Threshold. Bank 1. (Left Bank when stood looking at engine from front of car. Correct I believe ?????). 

Upon advice the Lambda Sensor Upstream was replaced (Denso as OE.). after only 20 miles the same fault kicked in again. The Lambda Sensor Downstream (again Denso as OE) was then replaced. After18 miles today the same fault has appeared I.E P0420, as above.

1/ Would appreciate advice on what to do next to correct this fault.

2/ Has anyone any experience of using branded Catalyst Cleaners that are put in the fuel tank and run through the system. The advertising for them, as one would expect, is full of praise and "a cure all". Is it worth trying for the sake of £20. Will they cause any harm or damage. 

3/ Do you believe I am really looking at the costly action of buying replacement Catalytic Converter/s which seem to be in the region of £155.00 each.

4/ Due to travel to Cornwall in two weeks and would like to correct this before the weekend away.

5/ Will it do any damage to run the car with this fault not corrected and the Yellow Management light continuing to show.

In anticipation of receiving some advice on above questions I would thank you in advance for your time and efforts on this problem

Best Wishes and Regards, John

Have been doing a bit of searching around the internet and have found this entry on a USA  Jaguar website, concerning P0420. It is suggesting that most of these codes P0420 generated are due to air intake via leaks, on usually plastic joints, is causing the problems. Leaks via Inlet Manifold etc, etc. and is shown on a video link in the posting.

I would really be grateful if some of the well informed members of this Forum would be kind enough to view this link and video and give me there thoughts/opinions on the suggestion of too much air being read by the Lambda Sensors. As per my post above I just do not know where to go from here now that both Lambda have been replaced.

https://www.jaguarforums.com/forum/x-type-x400-14/p0420-kept-coming-back-11218/page2/

Many thanks, Best Wishes and Regards, John.

Link to comment
Share on other sites

If you do have an air leak, which is very possibly the cause of your problem, then having a smoke test done will show where the leak is. Failing that, removing the airbox back to the throttle body and carefully checking the joints and pipes may show up a potential leak.

 

Link to comment
Share on other sites

On 9/20/2021 at 1:18 PM, Jimbov8 said:

If you do have an air leak, which is very possibly the cause of your problem, then having a smoke test done will show where the leak is. Failing that, removing the airbox back to the throttle body and carefully checking the joints and pipes may show up a potential leak.

 

Jim

Have removed airbox as your suggestion, no obvious air leaks. I am assuming it is in order to lightly hear air passing along from the air cleaner when I have my ear on the delivery tube to the throttle body.

Regards and Best Wishes , John.

Link to comment
Share on other sites


On 9/22/2021 at 11:25 AM, Wrinkly said:

Jim

Have removed airbox as your suggestion, no obvious air leaks. I am assuming it is in order to lightly hear air passing along from the air cleaner when I have my ear on the delivery tube to the throttle body.

Regards and Best Wishes , John.

Still not able to find cause of P0420 code, despite all that has been done (as per above details in this topic). 

However the car has recently had, six of each, new Ignition Coils and spark plugs (all good manufacture, E.G. Denso) and Inlet gaskets were new ones of Jaguar origin. Is it possible that during re-fitting the Inlet Manifold, that a gasket has been pinched or not positioned correctly. The car is showing no signs of what is usually considered as typical Cat Converter in effective, E.G. Smell, low mpg. smoke, power loss etc. etc. Every time the code is read and reset it appears again in 18 -20 miles of use.

 

Further advice would really be appreciated.

Regards and Best Wishes, John

Link to comment
Share on other sites


  • 1 month later...
34 minutes ago, Vladster said:

John did you ever manage to solve this problem....I'm having similar issues.

Martin

In a nut shell NO. Still working on it but I will get to the bottom of it. I shall tell the world what the problem was once I have solved the puzzle. Have just invested in a full blown Jaguar diagnostic and computer, the IDS/SDD that Jaguar agents use. Am now in the process of attempting to learn how to use it. It does not seem very easy or straight forward. However for a 71 years young non computer brained petrol head, it was never going to be easy. I now have my son in law on the trail of of exploring the route to using it correctly and he is a bit of a computer technic who usually has success with sorting any computer that I manage to almost destroy. The other problem is I am not engineering competent on todays electronic mechanics as I was brought up on, in my early years of mechanics, on a Mk 2 Jaguar with no fancy electronics.  

The most advanced I ever maintained  were my Nissan 200SX`s and my Nissan Skyline.

Good luck with P0420 and please let me know if you find a resolve before I do.

Nest Wishes and Regards, John

Link to comment
Share on other sites

  • 2 weeks later...

I have decided to "take the bull by the horns" and invest in a new Catalytic Converter. None of the other suggestions/new parts fittings have made any difference to the P0420 code.

Fingers crossed that this will cure the code from keeping reoccurring. I will update as soon as the job has been done and tested for what is usually 18 - 20 miles, after resetting the code.

Regards and Best Wishes to Everyone , John

Link to comment
Share on other sites

On 11/7/2021 at 4:52 PM, Wrinkly said:

I have decided to "take the bull by the horns" and invest in a new Catalytic Converter. None of the other suggestions/new parts fittings have made any difference to the P0420 code.

Fingers crossed that this will cure the code from keeping reoccurring. I will update as soon as the job has been done and tested for what is usually 18 - 20 miles, after resetting the code.

Regards and Best Wishes to Everyone , John

New Catalytic Converter fitted yesterday. Quite a lot of destroyed rubbish found in the old one. (Photo attached). Code reset and has so far completed sixteen miles and no yellow management light as yet. On previous times of resetting the code it has taken up to 18-20 miles to regenerate. Fingers crossed this time. The moral of this story may be, I should not have spent time and money attempting to deal with the P0420 Code by cheaper methods first. I.E. new sensors upstream and down stream, smoke testing, checking all joints etc etc. Followed lots of sound and helpful advice but eventually had to "bite the bullet" and buy the new Catalytic Converter. Not to worry, hopefully job done now.

 

IMG_20211113_090719_resized_20211113_091045039 - Copy.jpg

DSCF4400.JPG

DSCF4403.JPG

DSCF4423.JPG

Link to comment
Share on other sites

  • 6 months later...

15 hours ago, Papa Wilko said:

Did the new Cats completely cure the problem?

Andrew

The cat did eventually cure the problem. That was the last stage of many including inlet manifold removed to fit new plugs and new ignition coils and six new manifold gaskets. Also previous to the inlet off I had fitted both new Lambdas (one at a time and testing after each individual Lambda was fitted. The car had a slight misfire before my P0420 codes started. That in itself can kill the Cat, which it eventually proved had happened.

Word of advice if you decide to go a similar route: always use genuine manifold gaskets (Jaguar, in my engine there were six separate gaskets), always use Denso Lambda`s (Denso being OE equipment) and always purchase a good quality/dearer Catalytic Converter.  Cheap East Asian products do not work well on Jaguar engines.

If any other advice needed or questions to ask, please feel free to contact me.

Good Luck with sorting your problem.

Best Wishes and Regards, John

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share




  • Join The Club

    Join the Jaguar Owners Club and be part of the Community. It's FREE!

  • Topics

  • Our picks

    • Simply Jaguar show at Beaulieu - Sunday 23rd June 2024
      Jaguar Owners Club have a stand at this year's Simply Jaguar event at the National Motor Museum at Beaulieu, Hampshire on Sunday 23rd June 2024

      Tickets are available online here: https://www.beaulieu.co.uk/events/simply-jaguar/
        • Like
      • 1 reply
    • JAGUAR’S LAST PETROL SPORTS CAR: F-TYPE ZP EDITION TAKES THE CHEQUERED FLAG
      Jaguar is commemorating the end of its internal combustion sports car lineage in 2024 with an exclusive limited-edition F-TYPE inspired by two iconic 1960s racing E-types

      Just 150 examples of the F-TYPE ZP Edition will be the last internal combustion-engined sports cars designed by Jaguar. These 575PS supercharged petrol V8 F-TYPEs feature specially curated interior and exterior details by the personalisation experts at SV Bespoke.
        • Like
    • UPDATE SHOW INFORMATION !

      Please find attached your club label – please can this be distributed amongst your club members prior to the event. Please ensure that they print this label and display it in their windscreen upon entry to the event, this ensures that all members wishing to park within your club area are directed to the correct parking location by our stewards. Please do not modify or add logos to the club label.

      We do ask that all individuals have purchased their tickets on an individual basis in advance via our website, to speed up the entry process on the day. This can be done on our website here until 2pm on the day when admission closes: https://www.beaulieu.co.uk/events/simply-jaguar.

      Note that we do have two entrances available, one is exhibitors gate at the bottom of the hill as you come in to Beaulieu, with the other being the normal Simply event entrance within the attraction. Either entrance is fine to use and both are open from 9.00am, with the exhibitors entrance closing around 11am.

      Jaguar Owners Club (1).pdf
    • Simply Jaguar - Beaulieu Motor Museum - 25th June 2023
      Jaguar Owners Club have a stand at this years Simply Jaguar event at the National Motor Museum at Beaulieu, Hampshire on Sunday 26th June 2023

      Tickets are available online here: https://www.beaulieu.co.uk/events/simply-jaguar/


      TICKETS & PRICES
      Participant prices are only valid if arriving in a Jaguar and taking part in the rally. They are not valid for those arriving on foot.

      Participants can make the most of our EARLY BIRD discount by booking before 28th February 2023.

      Children under 5 require a ticket, this can be booked online free of charge.

      Participant and visitor tickets will include entrance to the rest of the Beaulieu attraction, including the National Motor Museum, Palace House, Little Beaulieu, World of Top Gear, Beaulieu Abbey and its grounds and gardens.

      The best time for viewing the Simply rally is between 10am and 2pm.

       

       


      Adult


      Child




      Participants – Early Bird*


      £14.00


      £7.50




      Participants – Standard & On The Day


      £16.00


      £8.00




      Visitors


      Normal admission applies.


      Normal admission applies







      *Early bird tickets are available until 28th February 2023

      VEHICLE ENTRY
      Entry with your Jaguar is from 9am – 2pm. Please make sure you have your ticket printed or available on your phone, ready to be scanned on arrival.

      Please do not arrive early for our Simply rallies as no facilities will be open prior to 9:30am.

      Cars cannot leave and re-enter the grounds for the Simply rallies.

      ________________________________________________________________________________________________________________

      CLUB STAND ATTENDEE LIST

      We do ask for a final update on numbers 2 weeks prior to the event following which we will send out club labels to you via email for you to then distribute out to club members. Club members then need to print and display these in their windscreen on arrival. This helps us then park you all in your club area together.

      1. Trevor (admin)
      2.  Paj
      3.  
       
      • 5 replies
    • F-TYPE marks 75 years of Jaguar sports cars and its final model year update
      The Jaguar F-TYPE is the definitive Jaguar sports car from a rich bloodline spanning 75 years and including some of the most iconic models ever built
        • Like

×
×
  • Create New...



Forums


News


Membership