Restricted Performance and Check Engine
Veteran Member
Joined: Jun 2009
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From: Home
Hard for us to say as the diesel was not sold in the US. Have you posted to the UK Jaguar forums?
They have pages and pages of problems with the diesel.
Jaguar XF / XFR (X250) 2007 – 2015
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They have pages and pages of problems with the diesel.
Jaguar XF / XFR (X250) 2007 – 2015
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Veteran Member
Joined: May 2013
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From: London, UK
Ouch, sorry to hear it - well, based on what the ELM told you, the garage's diagnosis seems to match. A cracked intercooler is going to mess with airflow in a big way. I don't know what's involved in replacing the boost valve & intercooler, but I imagine it's not a 5-minute job, so the labour costs don't look excessive.
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Joined: May 2009
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From: Yorkshire, England
Hi-tech diesel cars just can have lots of expensive faults as they get older. As Which? and others say, you need to do high miles to consider having a diesel. Even then it's a matter of luck how much fails & when.
If you don't trust the diagnosis, take it elsewhere.
If you don't trust the diagnosis, take it elsewhere.
Thread Starter
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Junior Member
Joined: Sep 2015
Posts: 25
Likes: 9
From: London
There is some UK member as well 
.
It's my first Jag and first repair. So I'm not too sure what to expect and what are the prices.
Only one good side that the warranty is covering ~£1000, so for me it's only ~£400 to pay.
Yes, agree JagV8. I'm starting to think of getting petrol car. Only one down side to get good economy and performance its need to be turbocharged...
.It's my first Jag and first repair. So I'm not too sure what to expect and what are the prices.
Only one good side that the warranty is covering ~£1000, so for me it's only ~£400 to pay.
Yes, agree JagV8. I'm starting to think of getting petrol car. Only one down side to get good economy and performance its need to be turbocharged...
Veteran Member
Joined: May 2013
Posts: 3,425
Likes: 1,136
From: London, UK
Yeah, we may be outnumbered, but we're here...
Or, in Jag's case, supercharged.
Yeeeeah...
Only one down side to get good economy and performance its need to be turbocharged...
Yeeeeah...
Joined: Oct 2009
Posts: 11,057
Likes: 2,271
From: Perth Ontario Canada
The point was that the OP has a turbo diesel, not sold in North America where most members on this site reside. The UK forum is worthwhile consulting for diesel issues.
Me restricted performance light is on full time now on my 2010 XFR. It first came on last week but quickly went away. Seems it's here to stay right now so I'll take it to the dealer in a couple weeks and let you know what I learn.
When I called them yesterday they predicted it would go off with 20 minutes of driving; which of course it did not.
When I called them yesterday they predicted it would go off with 20 minutes of driving; which of course it did not.
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Joined: Aug 2013
Posts: 1,640
Likes: 427
From: DFW, Texas
Me restricted performance light is on full time now on my 2010 XFR. It first came on last week but quickly went away. Seems it's here to stay right now so I'll take it to the dealer in a couple weeks and let you know what I learn.
When I called them yesterday they predicted it would go off with 20 minutes of driving; which of course it did not.
When I called them yesterday they predicted it would go off with 20 minutes of driving; which of course it did not.
We're you doing anything at the time to make the engine hot ie aggressive driving? And I'm assuming that even on cold starts it is doing it now, but wanted to rule out the supercharger coolant pump issue I had.
It actually went off after being on for 2 days. I am NOT a DIY guy, so my local Jaguar dealer will diagnose and repair. I'll report back.
CONFESSION: I put a full tank of regular gas in before this most recent episode and RARELY do this. I blew through the tank in 1 day and wonder if that's what caused it??? I use regular gas maybe once every few months if I am at a station and the price difference is huge and I am on the highway and know I'll go right through it.
CONFESSION: I put a full tank of regular gas in before this most recent episode and RARELY do this. I blew through the tank in 1 day and wonder if that's what caused it??? I use regular gas maybe once every few months if I am at a station and the price difference is huge and I am on the highway and know I'll go right through it.
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Joined: Apr 2013
Posts: 3,115
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From: OKC, OK
It actually went off after being on for 2 days. I am NOT a DIY guy, so my local Jaguar dealer will diagnose and repair. I'll report back.
CONFESSION: I put a full tank of regular gas in before this most recent episode and RARELY do this. I blew through the tank in 1 day and wonder if that's what caused it??? I use regular gas maybe once every few months if I am at a station and the price difference is huge and I am on the highway and know I'll go right through it.
CONFESSION: I put a full tank of regular gas in before this most recent episode and RARELY do this. I blew through the tank in 1 day and wonder if that's what caused it??? I use regular gas maybe once every few months if I am at a station and the price difference is huge and I am on the highway and know I'll go right through it.
Last edited by DPK; Feb 26, 2016 at 09:08 AM.
I don't know enough about what "Restricted Performance" is and what it actually means..But at face value, it seems that what I surmise, is that the ECM calibrates itself for the recommended Octane of 91 or better for "optimum performance"...but with 87 octane it has to dwell back too much and may fall outside the performance realm of the octane map it runs off of...Shocks the monkey....
Peter Gabriel - Shock The Monkey - YouTube
Peter Gabriel - Shock The Monkey - YouTube
Junior Member
Joined: May 2018
Posts: 1
Likes: 1
From: Dorset, UK
Jaguar XF 3.0D Lux S Restricted Performance
Hi Everyone,
My Jag has done 102K miles and the Resticted Performance indication displayed as I accelerated vigorously. This allowed me to carry on but lost top end on flooring it. After reaching my destination I turned off my ignition left it a few minutes then restarted the car. No Warning!
After pulling away it happened again and again a few days later when overtaking vehicles.
I have a rally driver and specialist vehicle engineer in our family so I took it to him. After explaining the issue to him he straight away stated that he suspected an electrical problem not mechanical one as the car was performing well. He connected his magic cable free diagnostic box to my car to check the fault codes etc. Straight away he was surprised to see that the fault history of the car was full of all sorts of misc defect reports. Pages of them! He pointed out that during maintenance and fault clearances these should have bee reset by the garage but they had not done this. He deleted the fault history of the car as it was full.
He suggested that if restricted performance indication happens again there would only be the code causing the problem.
Hey! It hasn't happened again. Deleting the fault history of the vehicle appears to have cured the problem.
To all you Jaguar 3.0D XF diesel owners - don't spend lots of your cash by taking taking it to garages and main agents ; do this task first, delete the fault history stored on the car's computer (only record the latest codes in case its not the cure).
I'm not saying this is a cure but it has worked for me. Baz
My Jag has done 102K miles and the Resticted Performance indication displayed as I accelerated vigorously. This allowed me to carry on but lost top end on flooring it. After reaching my destination I turned off my ignition left it a few minutes then restarted the car. No Warning!
After pulling away it happened again and again a few days later when overtaking vehicles.
I have a rally driver and specialist vehicle engineer in our family so I took it to him. After explaining the issue to him he straight away stated that he suspected an electrical problem not mechanical one as the car was performing well. He connected his magic cable free diagnostic box to my car to check the fault codes etc. Straight away he was surprised to see that the fault history of the car was full of all sorts of misc defect reports. Pages of them! He pointed out that during maintenance and fault clearances these should have bee reset by the garage but they had not done this. He deleted the fault history of the car as it was full.
He suggested that if restricted performance indication happens again there would only be the code causing the problem.
Hey! It hasn't happened again. Deleting the fault history of the vehicle appears to have cured the problem.
To all you Jaguar 3.0D XF diesel owners - don't spend lots of your cash by taking taking it to garages and main agents ; do this task first, delete the fault history stored on the car's computer (only record the latest codes in case its not the cure).
I'm not saying this is a cure but it has worked for me. Baz
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From: Yorkshire, England
Junior Member
Joined: Oct 2018
Posts: 1
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From: Albuquerque New Mexico
Restricted Performance + Symptoms
Hello everyone! I’m new to posting on the forum but have been very grateful for all of the things I’ve learned from it so far. I bought a 2000 XJ8 a few months ago and have been doing lots of work on it myself.
Currently, I have the orange Restricted Performance message + the check engine light. They came on about a month into me having the car.
The codes: P0171 & P0174
No other codes currently but I will update as I have them checked. (Currently waiting on a viecar code reader from amazon).
The symptoms + inspections:
- sluggish performance when RP message is on
- additionally, the first time i start the car in the mornings, it takes a long time to catch even if I cycle the engine on and off of accessory mode a couple times to prime the fuel pump. (I recognize this may be a fuel system problem, but I’m not sure. My intuition tells me that it is likely some kind of pressure keeper valve that is faulty because it starts fine the rest of the day, but over night it acts up, so maybe a slow leak).
- note that I tried spraying a flammable cleaner to identfy a vacuum leak and nothing was apparent to me (engine revs did not change audibly)
- I cannot hear any kind of whining either. In fact, aside from some minor clicking sound, the engine is relatively smooth
- at idle, the engine has very subtle tremors as if the something is trying to adjust the air fuel mixture rather sporadically.
- I did inspect the air intake boot/duct/body part right after the MAFS but I didn’t see any cracking.
Possible solution:
my friend, who has mechanic experience, has advised me strongly to change the upstream O2 sensors because he had the exact same thing happen to him on his car. He said even though the computer is not reading something wrong with the sensors, they may be causing the adjustment of the fuel mixture to be too lean. (My question with this is that: wouldn’t my ECU try to compensate by over pumping fuel, leading to worse fuel economy and smoke/Dark exhaust vapors?
Completed repairs:
I have done the following repairs myself and feel confident that I did everything right: please feel free to let me know about rookie mistakes I might have made during these jobs, though as I have never really worked on a Jag before.
- replaced valve cover gaskets (oil was leaking)
- replaced spark plugs
- new oil and filter
- new air filter
- New MAFS
- new air intake manifold gaskets
- cleaned fuel injectors lightly with spray cleaner
But the codes are still there.
I don’t have a lot of money to throw at parts so I wanted to check with the forum first. If I were to move forward myself, I would change the O2 sensors upstream, and if that didn’t get rid of the codes, i would try to create something of do a smoke test to see if a vacuum leak slipped past me. But I really want to hear what you guys think.
Sorry for the long post but more info is better on nuanced diagnostics. Thank you for your help in advance.
Currently, I have the orange Restricted Performance message + the check engine light. They came on about a month into me having the car.
The codes: P0171 & P0174
No other codes currently but I will update as I have them checked. (Currently waiting on a viecar code reader from amazon).
The symptoms + inspections:
- sluggish performance when RP message is on
- additionally, the first time i start the car in the mornings, it takes a long time to catch even if I cycle the engine on and off of accessory mode a couple times to prime the fuel pump. (I recognize this may be a fuel system problem, but I’m not sure. My intuition tells me that it is likely some kind of pressure keeper valve that is faulty because it starts fine the rest of the day, but over night it acts up, so maybe a slow leak).
- note that I tried spraying a flammable cleaner to identfy a vacuum leak and nothing was apparent to me (engine revs did not change audibly)
- I cannot hear any kind of whining either. In fact, aside from some minor clicking sound, the engine is relatively smooth
- at idle, the engine has very subtle tremors as if the something is trying to adjust the air fuel mixture rather sporadically.
- I did inspect the air intake boot/duct/body part right after the MAFS but I didn’t see any cracking.
Possible solution:
my friend, who has mechanic experience, has advised me strongly to change the upstream O2 sensors because he had the exact same thing happen to him on his car. He said even though the computer is not reading something wrong with the sensors, they may be causing the adjustment of the fuel mixture to be too lean. (My question with this is that: wouldn’t my ECU try to compensate by over pumping fuel, leading to worse fuel economy and smoke/Dark exhaust vapors?
Completed repairs:
I have done the following repairs myself and feel confident that I did everything right: please feel free to let me know about rookie mistakes I might have made during these jobs, though as I have never really worked on a Jag before.
- replaced valve cover gaskets (oil was leaking)
- replaced spark plugs
- new oil and filter
- new air filter
- New MAFS
- new air intake manifold gaskets
- cleaned fuel injectors lightly with spray cleaner
But the codes are still there.
I don’t have a lot of money to throw at parts so I wanted to check with the forum first. If I were to move forward myself, I would change the O2 sensors upstream, and if that didn’t get rid of the codes, i would try to create something of do a smoke test to see if a vacuum leak slipped past me. But I really want to hear what you guys think.
Sorry for the long post but more info is better on nuanced diagnostics. Thank you for your help in advance.
Senior Member
Joined: Jan 2012
Posts: 838
Likes: 690
From: UK
Getting back on track with this thread, I thought that I would let everyone know that we now have new stock of my revised design of bracket for3.6L engines built after number 108834 up to 4.0L and 3.2L A6 engines built before engine number 161586. We also have plenty of stock of brackets for later AJ6 and all AJ16 engines
