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robington

Tyre pressure monitoring system

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A warning came up today telling me the front and rear right hand tyres were around half the pressure they should be.  I checked the pressures and they are fine. Strange that it faulted 2 tyres at the same time.  Is there anything I can look at or try, to see what's going on ?

Thanks in advance 

Robin 

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Upgrade today to remove Google ads and support TLF.

If the sensors are of equal age, then it's reasonable to assume that the batteries are equally discharged which could be the issue?

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I washed my car this week and then next day one of the tyres was showing under pressure ? I pumped it up and although it’s showing the same as the corresponding tyre the warning light and still flashes ?

its happen before to front pair and after putting a little air the warning light corrected itself ! 

Not sure if washing the car has been the trigger but it seemly it’s looks like the case? Don’t know if the batteries have ever been changed ?

the Evora going for it’s MOT on Monday so hopefully this element won’t fail it’s MOT ? 

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Related to this, does anyone know what batteries the TPMS modules take?

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They are sealed units. Once the battery is dead, the entire unit has to be replaced. 

It is an old GM/SAAB part, which can still be sourced from the USA. 

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Oh really! That's a bugger. About to fit my aftermarket wheels and transfer them over. Was going to refresh the batteries beforehand. Oh well. I'll transfer them over and see how long they last (already 8 years old).

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They won’t last for long. I think that 8 years is already beyond their design life.

You’ll be better off buying a fresh, new set. If you run a search on here, you should be able to find the old GM/SAAB part number. They are much cheaper than the Lotus part number (surprise, surprise). 

Edited to add: I’m pretty sure that these are them: https://www.ebay.com/itm/Set-Of-4-NEW-OEM-13348393-Tire-Pressure-Sensor-For-GM-Opel-VAUXHALL-Saab-Lotus/192099086543

However, it would be worth double checking the part numbers via Googoo etc. 

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Thanks heaps for that mate. Appreciate that. That price is actually not much more than the service kit I was going to order from the US, so def worthwhile. 

 

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Well my car is 9 years old so that would tie in with the battery life expectancy then. Is fitting a potential diy job or would have to be done by a tyre fitter or something?

Thanks for all the help. Still finding  out about the car, but really enjoying it. More questions to come😊

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I found it easier to find new sensors by doing a search for Schrader sensor part# 20159. 

From the Schrader Tire Pressure Monitoring Systems Sensor and Service Pack Application:

 

 

 

 

sensor.JPG

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43 minutes ago, robington said:

Is fitting a potential diy job or would have to be done by a tyre fitter or something?

The tyre has to come off (or, at least, the ‘bead broken’) to fit the sensor. So, unless you happen to have a tyre fitting machine at home, (;)) it’s a job for the pros. 

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I had the same thing myself but it turned out that the valve needed a little tightening.

Once I did this, the warning light went off after I drove it for a few miles. 

It may be worthwhile trying this before you buy new sensors?

Edited by Jovver
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8 hours ago, 2011 Chrome Orange said:

I found it easier to find new sensors by doing a search for Schrader sensor part# 20159. 

From the Schrader Tire Pressure Monitoring Systems Sensor and Service Pack Application:

 

 

 

 

sensor.JPG

Thanks mate. Seems to be $480 by searching this part Number. The link above is $49. Might be the difference between genuine and knock off. Assuming the knock off ones still work, I guess it's worth a shot going with the cheaper option.

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39 minutes ago, Scotsdave said:

These don't work I've tried them. 

Thanks for that. 

 

Is there a way of testing these off the car. ie. without pressure being seen by them?

 

 

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Thanks for that David. About to pull the pin, so saved me the unnecessary purchase! Guess the other cheaper ones above are likely in the same boat then. Don't really want to spend $500+ on the genuine ones right now (given wheel / tyre purchase), so I'll just replace them as they fail in the coming months / years. 

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15 minutes ago, Bruss said:

Is there a way of testing these off the car. ie. without pressure being seen by them?

Don't they need to be 'woken up' before they start transmitting? I assume this is the reason there's no pressures on display for the first 30 seconds or so after setting off. Would make testing tricky. 

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Yes, thanks mate. Very kind of you. I'll likely do this in the near future. Unfortunately don't think I'd have time to post to you and post back (Australia) before the wheel fitment, so I'll likely get th TPMS sorted down the track a little. 

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@DBG Sorry I saw your location after I posted 😂 never mind!

@Bruss Let me dig out the machine tonight and get back to you as its sitting in my garage somewhere. 

Edited by Scotsdave

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Just for info, relating to Clive's post near the top of this thread the TPMS warning lamp is an MOT fail for cars first used after Jan 1st 2012. The below is from the government website. From that, I  assume pre 2012 cars will be exempt from that part of the test - that's the way I read it.

Tyre pressure monitoring system (TPMS)

The inspection of the tyre pressure monitoring system (TPMS) is for M1 vehicles first used on or after 1 January 2012. 

The TPMS warning lamp (see diagram 3) can operate in many ways depending on the vehicle type. You must only reject vehicles if it's clear that the lamp indicates a system malfunction and not simply indicating that one or more of the tyre pressures is low.

Diagram 3. Example of a TPMS warning lamp

Diagram 3. Example of a TPMS warning lamp

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I took my car to Central lotus today for its MOT and it passed no advisories /issues ! Thank goodness !

however the tyre pressure warning light is still on the pressure still flashing despite saying identical to corresponding tyre ? 

Central lotus cleared the code but their computer said a different tyre ? 

Anyway I will just leave for for a few more journeys and miles then see if the light disappears like last few times ????

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