TPM Exipry date

[Soltan]

I have the Tyre Pressure Monitors on my car and I've been told by the dealer that they expire ( I do currently have a TPM fault on the car but I've had it a while and never bothered getting it seen). He showed me the date printed on it but since that appeared to be a manufacture date I was a bit sceptical.

However a little digging on this site seems to suggest he was correct.

So what is the lifespan of these units (I have a 2003 E320 CDI Estate)?

Should they (or the valves) be replaced as part of a normal service or when the tyres are changed?

If one seems to have failed should all be changed at the same time to avoid sequential failure?

Any idea how much these things cost and if they can be bought cheaply from an Indi?

 

[whitenemesis]

I believe they last about 5yrs, it's the none replaceable battery that kills them. Once one has gone it's a fair bet the rest will go quite quickly.

They don't need to be replaced at each tyre change but quite often the units are damaged during the removal/fitting of the tyre.

I think they are approx £60 - £80 each.

 

[Soltan]

I believe they last about 5yrs, it's the none replaceable battery that kills them. Once one has gone it's a fair bet the rest will go quite quickly.

They don't need to be replaced at each tyre change but quite often the units are damaged during the removal/fitting of the tyre.

I think they are approx £60 - £80 each.

OUCH!

I need to boost my bank balance and income considerably if I intend to keep this car I think.

 

[whitenemesis]

Many drivers allow the sensors to die and then ignore them. You might be able to have the cluster alert disabled by the dealer