It's been nightmare..once in every week i was getting loss of pressure in rear-right tyre. I took the car to the tyre shop and they submerged the tyre in the water but couldn't find any leak..i reset everything (corrected pressure and reset from infoteinment) and again i got this warning pops up. but guess what i have already swapped the tyre with front right and the warning is coming from rear right again..so its false warning .Can anybody help me to fix this issue please 

Possibly a sticking rear caliper is the route I would be going down. 

Faulty abs sensor (or associated bits). Doubt a sticky caliper would do it unless it's sticking to the point of actually slowing the wheel rotation which is unlikely. Have a quick check of disc temperature (by feel) next time you stop. 

TPMS analyses the pattern from each WSSS not just the speed, so something on the rear hub is causing an irregularity in the WSS signal - like stickig caliper, failing wheel bearing, etc.

 

You say you swapped the tyre, I'm assuming wheel and tyre not just tyre?

Sorry, it will be Wheels not Tyre Swapping. What is sticking calliper? What should i look for? Does anybody have any picture for me to understand better. Thanks once again 

It can say 'Loss of pressure'  meaning the tyre circumference is less from the TPMS being set even when the Circumference is greater because a bearing is going or the brakes sticking and the wheel is heating up and the air in the tyre is hotter.

That is indicated by checking the centre of the wheel / hub is not hot.  Do not touch, just feel for warmth near.

 

As to the rest of the stuff, then plenty on here can help.

 

Has the Taxi been getting its brakes serviced annually or more often, brake fluid changed anytime? 

1 hour ago, toot said:

It can say 'Loss of pressure'  meaning the tyre circumference is less from the TPMS being set even when the Circumference is greater because a bearing is going or the brakes sticking and the wheel is heating up and the air in the tyre is hotter.

That is indicated by checking the centre of the wheel / hub is not hot.  Do not touch, just feel for warmth near.

 

As to the rest of the stuff, then plenty on here can help.

 

Has the Taxi been getting its brakes serviced annually or more often, brake fluid changed anytime? 

 

Wheel has been swapped with front right as i mentioned my post. So, there shouldn't be any wrong with tyre. it could be something else. last brake fluid was changed couple of years ago (8/3/21) though Kwik Fit said it was not necessary, but i had it changed . so it is not that old and i have brake disk and pad checked up during MOTs and every now and then. I am not aware of brakes service annually. I consider replacing any parts as and when needed to keep the car in optimal condition. Last time i had been to the garage Probably two months ago for replacing Coil springs and front shocks, they said Brake Pads and disks are perfectly fine and they have 50% life left. Rear Brake Pads were changed 9/8/21 and mileage was 51,500 miles and now car mileage is 96,500miles.

Edited 17 May, 20233 yr by automass

@automass

Quite a high annual mileage, so servicing and maintenance and inspections / checks are rather important. 

Best have someone cast an eye over the car again.

 

The point about the bearing or caliper and the hub heating the wheel so affecting the tyres pressure / circumference is that it does not matter if you changed the wheels / tyre for one without an issue. That one will also get hot.

'Just pointing out that loss of pressure shown can also be an increase of pressure.  When you get a warning you go feel if the wheel is hot, or check the pressure when you get the warning. 

 

PS

Kwikfit made me laugh. But i am sure they did check the Brake Fluid for H20 content. Not!

 

As to brake service annually, well annual is all many people do get services or inspections, but then they are not running cars as a business with fare paying customers.

Edited 17 May, 20233 yr by toot

41 minutes ago, toot said:

hub heating the wheel so affecting the tyres pressure

If the hub is heating the tyre, then the pressure would increase rather than reduce.  

@Gammyleg I thought i twice said that in different posts..

& the TPMS still flags as a tyre pressure loss because of the dimension / circumference / diameter when the TPMS was set.

 

Not a loss, a gain.  The system only came about as a warning for 'Run Flat tyres' blowing out.  It is not that 'simply clever'. 

Yesterday I took the wheels off for better look and seriously i couldn't find any fault/damage or whatsoever.  Pad has still 35% life left and disk is still in good shape and has good life in it. Well, last night as i was driving, my rear left  went over a mini pothole and instantly lose of pressure- rear right sign popped up. I stopped the car and inspected the tyres, but nothing unusual.  Anyway,i have decided to replace the rear brake disks and pads and front pads only. I want to summaize my post and needs one last favour from you guys please.

Current mileage 96,459miles

Rear Brake Pads replaced = 9/8/21 mileage: 51,500 miles (bought disks as well from autodoc but it was wrong measurement), garage guy said my disk was perfectly normal so not to worry. I am attaching the pictures for you guys to recommend the right size. 

Front Brake Disk and Pads replaced: 4/3/21, mileage: 41,580. still have 30% life left but decided to replace the brake pads only disk is perfect as of now.

 

Edited 20 May, 20233 yr by automass

3 hours ago, automass said:

Yesterday I took the wheels off for better look and seriously i couldn't find any fault/damage or whatsoever.  Pad has still 35% life left and disk is still in good shape and has good life in it. Well, last night as i was driving, my rear left  went over a mini pothole and instantly lose of pressure- rear right sign popped up. I stopped the car and inspected the tyres, but nothing unusual.  

 

Not convinced it would be any fault of the brakes themselves. And the fault on impact strengthens my theory of a loose connection. 

Check the abs sensors and cabling while swapping out the parts.

Hi Guys,

Still I am getting random false TPMS Warning.

I had my front brakes pads changed and rear Brake Pads and Disk both changed a month ago. The other night I got the warning for the front Left and last night i got the rear left tpms warning. I have my digital tyre inflator in my car all the time and i check the pressure of my tyres and balance them up every now and then and whenver i do it i set it through the infoteinment system as well. 

I never had of this kind weird false TPMS warning with my other two Octavias..

Does any one know how to recaliber or reset TMPS? something somewhere could be wrong.

Edited 27 June, 20232 yr by automass

12 minutes ago, automass said:

Hi Guys,

Still I am getting random false TPMS Warning.

I had my front brakes pads changed and rear Brake Pads and Disk both changed a month ago. The other night I got the warning for the front Left and last night i got the rear left tpms warning. I have my digital tyre inflator in my car all the time and i check the pressure of my tyres and balance them up every now and then and whenver i do it i set it through the infoteinment system as well. 

I never had of this kind weird false TPMS warning with my other two Octavias..

Does any one know how to recaliber or reset TMPS? something somewhere could be wrong.

Did you get the abs sensors and wiring checked as suggested by MarkyG82?

You reset it after having ensured the pressures are correct by pressing and holding the TPMS button while driving in a straight line, it should give a confirmation "bong" and the light go out if accepted.

 

Given your having driven over a pothole I'm fairly convinced you will have cracked the magnet in the NSR ABS sensor, I have just replaced mine after having put up with the exact same symptoms for several months eventually losing all ABS, ASR, TPMS and whatever else functions, dashboard lit up like a christmas tree, I had clipped a kerb with the exact same wheel as you which takes some doing given as we drive on the other side of the road here!

 

Sensor replaced and everything back to normality, they are dirt cheap, about €2.50 from Ali-Express, €10 from Ebay or add several zeros from Skoda!

 

Very very easy to replace, you dont even need to jack up the car but it will make life easier if you do and remove the wheel.

You set it after setting your pressures and while stationary. Not while driving.

Then once driving the system sets it,s self. 

 

*If the Owners manual you read tells you to do it some other way then do as it says.*

 

 

 

 

 

Edited 27 June, 20232 yr by toot

50 minutes ago, ords said:

Did you get the abs sensors and wiring checked as suggested by MarkyG82?

 

I didn't do it myself. but I asked the garage guy to check while he was doing the job (changing brake disks and pads). He said all was good.

6 minutes ago, toot said:

You set it after setting your pressures and while stationary. Not while driving.

Then once driving the system sets it,s self. 

 

I set the tpms while car was stationary..never did it while the car was running.

Good.

But @J.R.post to do it while driving and you 'liked' that.

18 minutes ago, J.R. said:

You reset it after having ensured the pressures are correct by pressing and holding the TPMS button while driving in a straight line, it should give a confirmation "bong" and the light go out if accepted.

 

Given your having driven over a pothole I'm fairly convinced you will have cracked the magnet in the NSR ABS sensor, I have just replaced mine after having put up with the exact same symptoms for several months eventually losing all ABS, ASR, TPMS and whatever else functions, dashboard lit up like a christmas tree, I had clipped a kerb with the exact same wheel as you which takes some doing given as we drive on the other side of the road here!

 

Sensor replaced and everything back to normality, they are dirt cheap, about €2.50 from Ali-Express, €10 from Ebay or add several zeros from Skoda!

 

Very very easy to replace, you dont even need to jack up the car but it will make life easier if you do and remove the wheel.

 

Nice to know that they are cheap aftermarket product and easy to replace. But which sensor I need to look for and where are they located?

 

@automassYour car does not have Valve Sensors on the wheels if your car is standard.

So cheap after market TPMS parts are not relevant to you.

 

The wheel sensor discussed before is part of the cars ABS system. 

Get them local, at a Motor Factor or get the mechanic to if needed and pay the going price local so that if the part is duff you get a refund. IMO.

 

*A TAXI is a business, maybe use a good mechanic and parts for you and others safety.* 

 

.............

Just to show what you do not have already or want to buy.

Edited 27 June, 20232 yr by toot

2 hours ago, toot said:

You set it after setting your pressures and while stationary. Not while driving.

Then once driving the system sets it,s self. 

 

*If the Owners manual you read tells you to do it some other way then do as it says.*

 

Yeah, like I am ever going to do that! 🤣

 

It  does work if you reset it on the move, the first time the light came on genuinely before the fault I stopped & checked the pressures, the front left indicated on the maxidot was indeed 3 or 4 psi down which impressed me. Not low enough for me to empty the load to find the footpump but I wanted a warning if it went down further so I just messed around with the button until it reset.

 

I was doing it loads while driving when the LHR ABS sensor was playing up, more convenient and safer to do it straight away while driving to get back the AS and other systems that it disabled.

Guys, so what is the summary. What action should I take to stop this false warning.

Why do you keep calling it a false warning?

 

It should be very clear to you from the patient contributions what the problem is and what you need to do to resolve it, you should not need to ask for a summary.

 

Replace the faulty ABS sensor on the LHR wheel.

 

 

42 minutes ago, J.R. said:

Why do you keep calling it a false warning?

 

It should be very clear to you from the patient contributions what the problem is and what you need to do to resolve it, you should not need to ask for a summary.

 

Replace the faulty ABS sensor on the LHR wheel.

 

 

 

it is false warning..because the tyre is not lossing in pressure that TPMS suggesting. I mentioned earlier that I have digital inflator and i am always careful with the pressure of my tyres. So, definitely it is false warning and it gives me in random tyres...month ago it was rear right, then front left, rear left and then front left..so all tyres got the warning.

Edited 29 June, 20232 yr by automass