Hi all, a second problem with my just-purchased 2008 XF SV8, the tyre pressure warning system keeps bringing up the warning screen. I have checked (and adjusted ) the pressures to the recommended 36psi for the 255/35 and 285/30 tyres. The warning that comes up scrolls around the four corners repeatedly. I had four new tyres fitted as part of the purchase agreement, wondering if there is some procedure that needs to be followed to re-set the system after new tyres are installed? Owners handbook suggests RF interference as a possible cause- can't see how I can escape RFI in this age. Does anyone have any solutions for this annoying problem?

 

I had a similar problem recently. My TPMS sensors were quite new, so I knew they were OK.
It turned out to be the Control Module under the front right seat. Since fitting a new one it's been fine. £100 UK from the Bay.
A point worth noting is that the faulty module didn't trigger any fault codes on either my SDD nor my Autel MOT Pro.
It is a known problem for the module to fail.

 

Also another thing to check, really bizarre. someone on the forums here told a story of there Toyoata I think truck with TPMS problems caused by an accessory plugged into the cigar lighter.

I had an issue with my XF and I pulled out the usb charger I was using and aha, fixed it all!!

Who knew, might as well see if that might be an issue if you have one installed...

 

i have a ford explorer - same issue - same simple solution - just unplugged the cell phone charger and tpms faults went away

 

I'm currently having the exact issue. Every week or so, after about 30 minutes of driving, I get a tpms fault sign, then the driver side rear would be highlighted in red and say that it cannot read the tpms. It didn't matter whether it was my stock wheels or aftermarket wheels. Took it to the dealer, and of course the problem can't be replicated, and absolutely no codes showed up so they didn't do anything. 3 days later it pops up again but went away after 15 minutes.

Next time it happens I'm going to drive straight to the dealer and ask them about the control module being faulty. I'll also try unplugging the car phone charger to see if that's the cause.

 

I don't have a phone charger in the car, in fact no other electronics in the car except the phone itself. The big 'check tyre pressure' warning comes on repeatedly during a short drive. It seems to correct itself on a longer drive- say after about 30 minutes of driving- but starts all over again the next time the car is driven. The warning cycles around all four wheels. I read a post about people having to replace the module under the seat- any idea how much a new module is worth?

Just another thought that occurs to me- I wonder if it could be RF interference from other vehicles that is causing it? I'll have to keep an eye on whether it happens when I'm not near other traffic.

 

I found a brand new module on eBay UK for £100.
There are 2 different frequencies, the UK/Europe type are 433mhz and I think the USA are 315mhz. Make sure you get the correct one for Oz.
You have to unbolt the front right seat and tilt it back to remove the air ducting underneath, the module is under that held with 2 nuts. It's quite an easy fix.
I've had no trouble whatsoever since I changed mine. Remember, mine didn't flag any fault codes, I changed it on the advice from the UK Jag forums.
Good luck.

 

Well the fault still occurs when there are no other vehicles around, so that rules out interference from other people's stuff. Went for a drive yesterday and the tyre pressure warning came up before I was even out of the driveway, we are in a rural location with no-one nearby so it is all me. Again, after 20 minutes or so the annoying problem goes away but it is back again the next time the car is driven. I guess I'm in the market for a module.
I'm wondering if I should replace the transmitters in the wheels while I'm at it- are they at the valve stem, or do I need to get inside the tyres?

 

It is necessary to remove the tyres in order to fit new sensors.

 

buy jaguar/siemens/VDO oem sensors - you can get full set on ebay for about $135 if i recall correctly. i had a set of aftermarket in the proper frequency and it would intermittently state system fault. I've never had an issue since replacing with OEM. Yes, need to access inside of wheel to change.

 

The tyre pressure warning continues to be a nuisance. I expect I'll be replacing the module; is there a way to determine what frequency the system will be, here in Australia? is the frequency identified on the outside of the module itself?

 

? Did I miss something? Your car is 10 years old and I do not see that the sensors have been replaced. This is being discussed in the x150 forum too.

cheers

 

Thanks for that Guy. I just read through the thread on the X150 forum. It seems that the wheel sensors should be replaced, which makes sense in a battery-operated unit that is 12 years old. I still need to find out what frequency they operate on here in Australia so I can look for either 'continental' spec or 'US' spec units. I'd prefer to keep the system active rather than get rid of it, but the false alarms on every drive are getting to be a pain.

 

Try putting 36.5 or 37.0 psi in the tires and see what takes place. Your saying that after 30min of driving the pressure warning is not that often.

Gus
JagRepair.com - Jaguar Repair Information Resource

 

I think it just depends what error comes up. If it's telling you check pressure randomly in all 4 tyres then most likely it's the module. If if says fault (which means it's not communicating with the tpms sensor in the wheel) then it could be battery
The whole module is about the cost of one OEM sensor (plus install). So I would prob try the module first.

Also possible that non oem sensors were used (which can cause intermittent issues) but again it's the fault error not a check pressure warning

 

Don’t buy the cheap knock offs!
Im certain the frequency is listed in your workshop manual... I was under the impression the frequency was global... need to check that.

 

I had a similar problem with mine for a few months and tried virtually every option discussed on all of the threads that I could find.

Turns out to be the tyre inflater at my local service station was out of calibration. Bought an accurate hand held pressure guage and it measured 3 PSI lower than the automatic inflator. Set the inflator to 39 PSI, no more problems since. I keep a close eye on the pressures in my tyres but it's been a thing of the past now for two years.

 

Well that is an interesting thought, especially when combined with the observation above that the warning is not coming up once the tyres are warm. Starting with the simplest thing makes sense; I'll put a few more PSI all around. I have checked them with a hand-held pressure gauge but to be honest I don't have much confidence in the one I have, it's over 10 years old and has been dropped once or twice.

 

I use a digital pressure gauge.

Gus
JagRepair.com - Jaguar Repair Information Resource

 

+1
That's what I have.
It's display is also backlit for night use. Analogue guages don't have that feature.