Hi all

My L322 4.4 TDV8 randomly comes up with Restricted Performance and throws the code above: P0486. It can happen within a mile or doesn't happen for over 300 miles - any words of wisdom much appreciated as its a real nuisance and sometimes refuses to clear on my code reader meaning for very slow progress.

Would EGR cleaner help? DIY solutions needed ideally as my Indy is shut thanks to the COVID-19 outbreak.

Thanks in advance!
J

Restricted Performance is nearly always a boost leak, however that code is not one I've seen come up.

Have you searched it here?

Also what happens when you clear the code, does it get rid of the restricted too?
I would try to observe whether the code tripping and restricted events are definitely tied together.

EGR Sensor B is on the EGR unlike sensor A which is a common fault and the sensor is located on the NS exhaust manifold. ( https://www.fullfatrr.com/forum/topic50202.html )

What you can do is find the EGR and unplug it, read you error codes and replug it and repeat, trying to establish if the sensor is duff. But I remember you had issues before so it's possible your EGR is really dirty / clogged.

I personally don't recommend an EGR cleaner in the intake engine running. Any bits you may dislodge with go through your composition chamber, turbo and likey get stuck in the fine screen of your DPF.

Better, if you are up for it, to take it off and clean it with a £3 can of brake cleaner.
Clean your throttle body and your donut too while you're at it.

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Hi there,

Thanks for the reply!

I have searched it on here and there really isn't very much on it, nothing appears to be the same as what I am experiencing.

When I clear the code it gets rid of everything and the car is like normal! This can last a few days or a few hours which is odd. The codes are related though I would assume.

I did previously have EGR problems which a garage just fixed - it was throwing P040D EGR Temp sensor A circuit high. This was fixed and replaced with the code I now have. Annoyingly due to Covid 19 I cannot take it back to the garage as they are temporarily closed so attempting to diagnose myself.

I dont really want to get into taking the whole unit out of the car as worried I may cause more damage than good.

The car has no DPF anymore so I guess the EGR cleaner may do some good?

Look forward to hearing, thanks in advance.
J

They might have bodged it, especially hearing the DPF is removed.
I wouldn't have done that and, not judging, only the ECU would need some tricking / reprogramming as the whole set up (and running) of the engine relies on reading from the DPF and the EGR.

It also makes me wonder if they fixed the A sensor for your other fault, it's a pig of a job and risky (can strip thread or nut and then the whole manifold is shot) and if they are laptop junkies maybe they had a go at programming out sensor A? Possible knock on effect. Only speculating.

If you spray in foam cleaners your turbos x 2 will still ingest everything you put in and all the crud you loosen.
.
. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Well the DPF was actually removed prior to me purchasing the car - I was only aware of this when I was told the car needed the necessary programming.

Yes that could be the case, I guess we wont know until they reopen and can investigate again. I assume the two problems are linked...

Ok I wont be using that spray then!

Thanks!

Do you think it is ok to continue to drive the car despite all this?

Do you think it is ok to continue to drive the car despite all this?

I'd have a look and see if sensor B has been unplugged.
If it were me and I could clear the restricted I'd carry on.
. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Thanks for the advice - will carry on in that case!

Will sensor B be fairly straight forward to find? Im not amazing mechanically haha

Has it had an MOT since the DPF was removed ?
Automatic failure if they suspect it has been tampered with.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Its obviously been done very well - the garage didn't realise at first!

I assume its been through one or more yes

FYI I would never tamper with a car i believe they're right as they came from the factory

Is it possible that it is an import ?
A limited number were made without DPF for export and the WM shows a non DPF exhaust system.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Hmm i think it looks a little beyond me to remove that 'doughnut' manifold! Worried about making things worse than better haha

jjjjs5518,
I have same symptoms on mine, i did change sensor that triggers P0486 but the fault remains. I'd very much appreciate if you keep us informed on your progres.  2012 TDV8 Black Edition
2000 Disco. TD5
1975 series III