So you are saying its actually 12/11/06, which is also very interesting because the car was registered in September 06.

But thanks for that, its still at the garage with instructions from me to do a smoke test, if there is a leak I will sort it at no matter where it is, except Injectors and inlet manifold. But if no leak is found than prove the fault to the warranty company.

I should know more tomorrow. Range Rover 4.2 Supercharged 2006
Ford Focus EcoBoost 1.5 2017
MG TF 2003

Previous Cars of note
Land Rover Discovery 2
Jaguar Mk2 3.8 - Company car
MG Midget 1974 - Concours

Last edited by bigbo on 9th Jan 2021 1:15am. Edited 1 time in total

Smoke test showed big leak on brake vacuum hose where it meets the manifold, So I'll get a visual on that in the next few days (its supposed to be warming up a little) and get one ordered.
Looking in the manual its a complicated bit of pipework, which sounds expensive. Does anyone know if it breaks down to multiple parts?

According to the garage its so bad the smoke machine couldn't get to full pressure, and yet my brakes work perfectly.

Edit - Looking at the manual in a bit more detail there are 2 check valves which look like the electric pump would provide a vacuum if the feed from the manifold fails. So definitely need to get a look. Range Rover 4.2 Supercharged 2006
Ford Focus EcoBoost 1.5 2017
MG TF 2003

Previous Cars of note
Land Rover Discovery 2
Jaguar Mk2 3.8 - Company car
MG Midget 1974 - Concours

Yes I know its been a while, but lockdown has meant very low mileage......

The P0171 code has come back as I expected, done lots of checks since last time, it is now joined by a P0420 fault "catalyst system efficiency below threshold"
I've done some research and I find two schools of thought

1. The cat is becoming blocked/failing causing back pressure therefore causing the P0171 error on that bank. This can be ignored until such time that it fails an emissions test and replacement of the cat is required.

2. It is caused by one of the O2 sensors failing. The pre cat sensor has been replaced with an original part, so maybe the post cat sensor has failed. I think I understand that the pre cat sensor should have a varying signal and the post cat should have a steady signal and if that's not correct the P0420 error is thrown.

Using my iCarsoft i930 I can see that the LTFT static measurement is 12%, live is showing 5 to 20% on bank 1 but bank 2 is near to 1%
As far as I can tell I have no vacuum leak.

So I would like to test the O2 sensors on bank 1, has anybody done this? How do I break into the circuit to connect my Oscilloscope?
Or can I see this data on my iidTool?

I am very nearly convinced that this is a bank 1 issue and therefore not caused by an issue with the shared intake system, but am willing to believe anything with these cars!



Any comments please?

Thanks
David Range Rover 4.2 Supercharged 2006
Ford Focus EcoBoost 1.5 2017
MG TF 2003

Previous Cars of note
Land Rover Discovery 2
Jaguar Mk2 3.8 - Company car
MG Midget 1974 - Concours

1) do you have lpg?
2) put the height up on the car and then hit the cat lightly with a rubber mallet on the offending side or hard with the base of your fist if it rattles it’s new cat time.

If you shop about you may get good money for scrap - they pay £600 for a good one and that would take the pain off of buying a new one Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Thanks for responding

No no LPG, when I bought the the car I planned to convert it but after more research and reading on this forum have decided to stick with petrol.

I will get underneath as soon as the weather is fit. I hadn't thought of the second hand value of an old cat, but if they weren't worth anything then why are they stolen so often! So thanks for that, £600 would go a long way towards replacement.

In the meantime I will continue to drive it and do some more research...... Range Rover 4.2 Supercharged 2006
Ford Focus EcoBoost 1.5 2017
MG TF 2003

Previous Cars of note
Land Rover Discovery 2
Jaguar Mk2 3.8 - Company car
MG Midget 1974 - Concours

Don't think it's worth messing about trying to read what the lambdas are reading, cheap enough to just change both...

In the real world fuel trims should be under 10%...

Lots of alternatives to original cats that are much cheaper, Google "custom stainless steel exhaust" there should be some close to you...

 Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Agreed however the cheaper cars I have had on the past have been ok up until say 4000rpm where the mot tester is going up to but can’t cope above so start to stink.

I have one brand new sensor for sale £50 proper denso one if interested - you could use one and swap it or just buy another Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Always used Magnaflow, never had any problems..  Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I'm have the same issue and did you end finding the issue?

P0171 is my code, im running out of budget and dmv granted me my last moving permit
Help

Hello,
I'm having the same issue with my 06 sc and did you end up finding the issue?

P0171 is my code, im running out of budget and dmv granted me my last moving permit
Help

Smoke test it you either have an air leak or most likely a sensors malfunction in the maf or o2 sensors Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Ok ill get it smoke test, I called the dealership to get it diagnosed it they said they're aren't able to do it because of the year and they aren't able to fix it also crazy right the dealership too.
Anyways what was your p0171 end up being the issue on your car? Cause I replaced all o2 up and down both sides and catalytic converter too,maf all oem parts still the p0171, what was your issue during the time?

Ty

I changed all of that - and there’s a breather I think a circular bit of plastic which was leaking - also and I bet yours has done this - there’s a little pipe that goes between the s/c output plate to the fuel pressure sensor - the pip goes floppy and blows off - another air leak. Also the concertinas between the air coolers and charger plate - both leaking too. Changed all this then it ran rich… then I changed the coils and plugs now it’s all good. Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

I think that I have fixed the P0171 error by resetting the engine adaptations,
see My Range Rover post here https://www.fullfatrr.com/forum/post598337.html#598337 Range Rover 4.2 Supercharged 2006
Ford Focus EcoBoost 1.5 2017
MG TF 2003

Previous Cars of note
Land Rover Discovery 2
Jaguar Mk2 3.8 - Company car
MG Midget 1974 - Concours

@bigbo What is engine adaptations? Where is that located?
Ty for the reply
@Danwilderspin I'm actually new and the parts you've replace I've never heard of picture maybe that would help me? I've replace pcv too