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So, the story so far...
I have not that long bought an XF 3.0 diesel 2013.
I got it professionally remapped which took the BHP from 240 to 290.
The next morning it showed a fault - Restricted Performance. I plugged in my OBD gadget and it showed Fault Code P2031, Exhaust Gas Temperature Sensor, Circuit Bank 1 Sensor 2.
I bought a temperature sensor from British parts.co.uk. It has just been fitted, N/S post cat.
All seemed fine when fitted, no faults showing.
The next day, started the car and the same fault code is showing and restricted performance.
what I have discovered is that once the car is warm, I can turn off the engine, turn it back on and there is no fault.
The other thing is it is not showing in logged faults but in pending faults on my OBD app.
I can also clear the fault when the engine is still cold and it is fine.
So it only shows on first start up from cold.
Another thing I discovered was that there were 2 turbos, I thought the 240bhp was a single turbo.
Also it has only one cat, the passenger side one. I took some pictures. The tuning guy was surprised but said it didn't look like anyone has played with it.
Any ideas?????
Last edited by GGG; Sep 21, 2021 at 02:37 AM.
Reason: Remove duplicated text
Geographical questions (e.g. meetings, recommended specialists) in the REGION forum; technical questions in the MODEL forum. I'll move the thread to X250 forum once you've seen this reply.
The exhaust on the 3.0 diesel does only have one Cat:
The Jaguar decode for P2031 indicates it is a COLD START check fail hence why it does NOT APPEAR with a warm start.
I would expect a professional tuner would be aware of this.
Did you talk to the professional remapper? What's his take? Does the issue go away when you revert to the original tune?
Your original tune is on the safe side and has adapted to certain issues over time (i.e. small intake leak, engine wear), but the remap is expecting everything to be perfect and pushes to the limit of each variable. That's how you get the extra power.
But especially on older engines things might have been out of certain limits for a long time, perfectly fine for the original tune, but not good enough for the remap.
I'm no expert on Diesel, but P2031 is usually particle filter related. It may worth to drive the car for a longer stretch at highway speeds to clean the filter. Maybe that takles the issue already.
Did you talk to the professional remapper? What's his take? Does the issue go away when you revert to the original tune?
Your original tune is on the safe side and has adapted to certain issues over time (i.e. small intake leak, engine wear), but the remap is expecting everything to be perfect and pushes to the limit of each variable. That's how you get the extra power.
But especially on older engines things might have been out of certain limits for a long time, perfectly fine for the original tune, but not good enough for the remap.
I'm no expert on Diesel, but P2031 is usually particle filter related. It may worth to drive the car for a longer stretch at highway speeds to clean the filter. Maybe that takles the issue already.
Chris
It has been on a couple of long motorway runs, 1.5 hours and pushing speed for long stretches.
I am talking to the remap guy and he is waiting on feedback from the company that supply him with the software.
when looking at the image it looks like you worked on the cat, not on the particle filter. Which sensor did you replace?
Chris
As I said in the description, the post cat temperature sensor got replaced and from what I have been told so far, it should have been the dpf temperature sensor.
As I said in the description, the post cat temperature sensor got replaced and from what I have been told so far, it should have been the dpf temperature sensor.
Right, I overlooked that.
I guess you are getting a dpf temp sensor now?
Chris
Looks like there's a fluid leak from the transmission pan seal too (or is that from the rear crank seal and just collecting at the lip of the pan?), just FYI.
Looks like there's a fluid leak from the transmission pan seal too (or is that from the rear crank seal and just collecting at the lip of the pan?), just FYI.
I did have a bit of an oil leak from the sump bolt which was not tightened properly from the last service. It was only hand tight which was a bit worrying...
Geographical questions (e.g. meetings, recommended specialists) in the REGION forum; technical questions in the MODEL forum. I'll move the thread to X250 forum once you've seen this reply.
The exhaust on the 3.0 diesel does only have one Cat:
The Jaguar decode for P2031 indicates it is a COLD START check fail hence why it does NOT APPEAR with a warm start.
I would expect a professional tuner would be aware of this.
Graham
Graham, looking at the exhaust diagram above, I cannot work out which number is the particulate filter inlet exhaust gas temperature sensor.
Is there a part number for this for me to search for a new one?
Google searches seem to bring up different temperature sensors and when going on specific web sites, they are not specific about where their particular sensor goes.
Maybe it is a main dealer part only...
So, as of today, 23rd November, I have replaced the post cat temperature sensor and the dpf temperature sensor.
When I replaced the dpf temperature sensor, the next morning it was fine but the morning after that it reverted back to the same fault as the start of this thread.
I had my 2014 3.0S remapped last week, and immediately having exactly the same issues with the restricted performance and the P2031 code. The company came straight back to check the map and suggested I take the car for a lon run to regenerate the dpf etc. Absolutely no difference. Every cold start brings the same fault/code.
I Just want to get the map removed and get back to standard ASAP. Expensive lessons learned!
I had my 2014 3.0S remapped last week, and immediately having exactly the same issues with the restricted performance and the P2031 code. The company came straight back to check the map and suggested I take the car for a lon run to regenerate the dpf etc. Absolutely no difference. Every cold start brings the same fault/code.
I Just want to get the map removed and get back to standard ASAP. Expensive lessons learned!
There still must be a reason and cure without removing the remap...
I have an OBD gadget plugged into the car so on a cold start I can just use the phone to clear the fault codes but obviously this isn't a long term solution.
Fault code help needed
