Hi I'm new to forum so apologies if I have this in wrong section.

My car for past 6weeks has been constantly having the engine mgmt light coming on

1st time it came up it stored quite a few faults, 420,430 and ones relating to mis fires on cylinder 1,4,5,7

The garage took it for a run and said it seemed to be performing ok with no misfires. I should ad that at this point it had only be driven a few times over past 3 months ie up to 1st time EML appeared.

They erased codes and said see how it goes.

Over the following 5 weeks the EML came on 5 times and only codes were 420 and 430 ie catalytic covertors below min threshold. No misfires although when idle car might go up and down revs slightly.

I took it to official LR dealership on Thursday and they said both cats need replaced, only 78000 miles on this.

I'd really rather not spend £1500 getting these fitted so I was thinking of following

A) getting aftermarket ones from USA and fitting them?

B) cutting them out, removing the cat,, welding "shell" back on and using spacers in o2 & lambda sensors stopping EMl coming back on.

Any one had this issues before and would A or B work

Thanks

A) The Cat's purchased from America "may" not be the same spec as yours. Different countries all have different emissions laws, and the ones you purchase may not "clean" the emissions enough to pass a UK MOT

B) Nice idea in theory, but without the Cat internals, it will never pass a UK MOT

Interesting the company I was at yesterday said to me that any of the ones they have had do this have passed, they did also say that for 2-3 weeks prior to test running car on BP Ultimate would also help.

Does anyone know any companies in uk that do aftermarket cats for supercharged RR that are cheaper than OEM LR ones?

Thanks

Try Dan at Duckworths he is one of our sponsors, also Yeovil Land Rover (Nick AKA The Large One) on the Disco forum
http://www.disco3.co.uk/forum/sponsors.php In Spain - 2018 F Pace - Frightened away from the Sports due to crank failures
Gone - A couple of RRS, A couple of Disco's. However thinking of another Sport.

I had custom cats made while having a new exhaust made in ss. Whole system £800 fitted with life time cover. mot passable.

Who did that for u?

had cats taken out and lambda spacers put on, so far so good no EML

Also the difference in performance with cats out is phenomal

Will keep youse updated

Sorry for the late reply. Mij exhausts

Tigerdon wrote:

had cats taken out and lambda spacers put on, so far so good no EML

Also the difference in performance with cats out is phenomal

Will keep youse updated

Just wait until your car needs an MOT

Well the guy that did it has done several, none RR I must admit but M3 RS4 Audi and to date not 1 fail.

So I suppose next May we will see

Keep us updated

I would be very keen to hear your results. I have a similar problem but have been a little reticent to ask about CAT removal on here as it seems to be quite a controversial topic.

In my case most of the reasons against CAT removal are not valid. I live in West Africa where there are no emissions regulations and the fuel is probably the worst quality in the world. I am pretty sure that if I simply replace my cats then I will need to do this every few months (=expensive). I've already replaced EGR valves, cleaned MAF and MAP sensors, replace oil, oil filter and fuel filter every month.

If you are successful fitting after-market cats that might be more forgiving to dirtier fuel or can advise on the procedure to remove cats and the best dodge so that fuel consumption does not go through the roof then I - for one - would be very grateful to hear the results.

On a TDV6, decat it regardless

Even our MOTs over here dont require a cat on a diesel engined car. But petrol cars do

So @disco_mikey you are definitely one of the leaders on How-to (I successfully followed your EGR replacement instructions with no issues - spot on)... So could you give a bit of guidance on what we might do to get rid of the cat and if possible avoid any eml / fuel consumption issues.

Btw - if I bought a Hawkeye or similar and reset the eml how long would it stay off with no cat? Would it come back on each time I run the car?

I have had a decat pipe on mine for 4000 miles now, with no issues

2 options to decat it, either buy a replacement pipe, there is currently a group buy running on the D3 forum. Or, cut the cat open, smash out the internals, and weld it back together. A bit brutal, and not as smooth flowing as a replacement pipe, but net result is the same

http://www.disco3.co.uk/forum/topic95339.html?highlight=decat