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Hi Everyone,

I've just joined the forum, I'm looking for all the help I can get and hope to be able share some knowledge/experiences which may be of use to others. I'm based in Dudley in the West Mids and work in Birmingham. I purchased my first Jag in May 2019 and it was the the stuff of dreams for about 6 months and then it turned into a nightmare...Restricted Performance with code P1248 is dogging me. The story so far in short is that one of the rocker covers had cracked which was replaced and cured the problem for about 3 months then the same thing started happening again (same code) mainly when I call for power when joining the motorway off the slip road but also randomly in any situation but less frequently whilst in dynamic mode? I've had the actuator replaced, smoke tested the boost system (no leaks), boost valve cleaned and much more but to no avail. Someone suggested to me yesterday that there is a second actuator which serves the the other turbo...is this the case and if so does anyone know where its located?
It's a 2011 XFS 3.0 tdi portfolio 275bhp

Cheers

Paul
 

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Hi Paul. Welcome to the forum.
Yes, the secondary turbo valve actuator is a common and well documented fail on the XF. It's located low down, at the front of the engine and just visible when looking down the LH (as you're looking at bit) side of the radiator/intercooler matrix.
Looks like this . . . .
182324
 

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Discussion Starter #3
Hi Everyone,

I've just joined the forum, I'm looking for all the help I can get and hope to be able share some knowledge/experiences which may be of use to others. I'm based in Dudley in the West Mids and work in Birmingham. I purchased my first Jag in May 2019 and it was the the stuff of dreams for about 6 months and then it turned into a nightmare...Restricted Performance with code P1248 is dogging me. The story so far in short is that one of the rocker covers had cracked which was replaced and cured the problem for about 3 months then the same thing started happening again (same code) mainly when I call for power when joining the motorway off the slip road but also randomly in any situation but less frequently whilst in dynamic mode? I've had the actuator replaced, smoke tested the boost system (no leaks), boost valve cleaned and much more but to no avail. Someone suggested to me yesterday that there is a second actuator which serves the the other turbo...is this the case and if so does anyone know where its located?
It's a 2011 XFS 3.0 tdi portfolio 275bhp

Cheers

Paul
Hi John,

Thanks for the response...I'm pretty sure that this hasn't been looked at yet, hopefully this is the problem as I think everything else other than a software issue has been eliminated 🤞
 

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Welcome. What's the mileage on your car, and do you take in longish journeys so the dpf can do a regen?

I've had nightmare issues with my Jag, carbon bulid up... Keeps knocking it into RP when a sensor gets blocked
 

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Discussion Starter #6
Welcome. What's the mileage on your car, and do you take in longish journeys so the dpf can do a regen?

I've had nightmare issues with my Jag, carbon bulid up... Keeps knocking it into RP when a sensor gets blocked
Thanks, It's done 100K with a good service history, I travel around 20 motorway miles per day. One of the diagnostics indicated that the DPF had attempted and failed to regen over 200 times but that's been sorted, there were boost leaks in several places which have all been sorted along with the several loose bolts around the air inlet manifold (all a result of the so called "Turbo Specialist's" handiwork). There were all manner of bad workmanship issues and each time one was identified you'd have bet money that it was the sole cause of the problem but its back in RP within a few miles. The boost system has had a thorough overhaul and the problem is still there. I still have the car at the moment but I've almost given up on it, I plan to sell it now because I have no faith in it, I've since purchased an XFR which is a total gamechanger so I'll be keeping this.
With your sensors...how often does the issue return after you sort it?
 

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Thanks, It's done 100K with a good service history, I travel around 20 motorway miles per day. One of the diagnostics indicated that the DPF had attempted and failed to regen over 200 times but that's been sorted, there were boost leaks in several places which have all been sorted along with the several loose bolts around the air inlet manifold (all a result of the so called "Turbo Specialist's" handiwork). There were all manner of bad workmanship issues and each time one was identified you'd have bet money that it was the sole cause of the problem but its back in RP within a few miles. The boost system has had a thorough overhaul and the problem is still there. I still have the car at the moment but I've almost given up on it, I plan to sell it now because I have no faith in it, I've since purchased an XFR which is a total gamechanger so I'll be keeping this.
With your sensors...how often does the issue return after you sort it?
This is something which has been going through my head. My car is running great, but the miles are going on and it's difficult to have much love for a diesel. I'm not sure how much I'll be willing to spend on her over the coming years. But a supercharged petrol is something I'm sure I'd be happy to pour the pounds into if necessary as I would see it more as an investment.
 

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This is something which has been going through my head. My car is running great, but the miles are going on and it's difficult to have much love for a diesel. I'm not sure how much I'll be willing to spend on her over the coming years. But a supercharged petrol is something I'm sure I'd be happy to pour the pounds into if necessary as I would see it more as an investment.
when RP is called DPF regeneration won’t be attempted. You have to force it via SDD.

P1248 seems to be over boost. have you checked secondary turbo shut off valve? The one that sits on the back of secondary turbo.

how about your MAP sensor?
 

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when RP is called DPF regeneration won’t be attempted. You have to force it via SDD.

P1248 seems to be over boost. have you checked secondary turbo shut off valve? The one that sits on the back of secondary turbo.

how about your MAP sensor?
Not me, my turbos are sweet at the moment. I'm going to regret saying that though.
 
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