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Discussion Starter #1
Can anyone share instructions on how to reset a false TPMS malfunction telltale?

Pressure is perfect and the darn light won't go out. Short of putting black electric tape over the the warning light, I'm at a loss. It did happen once before couple of years back, and it was reset by the dealer.

I have 2008 Smart forTwo Passion. Thanks in advance!!!
 

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Double check that the pressures are where you want them to be, then hold the TPMS button in for 5 seconds (until warning lamp flashes) with the key on.

But ... If that procedure does not reset the warning lamp, you probably have a bad tire pressure sensor. If they are the original sensors, they have a battery in them, and that battery is probably nearing the end of its life. Only fix then is to replace the faulty sensor.
 

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Discussion Starter #3
Thanks! I believe batteries are rated to last for 10 years(?). Would the sensor have to be replaced (boy they're not cheap) or there's a way to reset it?
 

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Sadly, you need to replace one or more tpms sensors (inside the tire(s))
If one sensor goes, it doesn't matter if you have correct air pressure or not. Dash light will stay on. I have one smart that has the remedy you mentioned. Black tape over the indicator. I think new fancy shmancy setups have individual readouts for
every tire, but not the smart.
 

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Discussion Starter #5
Jakieowner, yeah, looks like it's electric tape and $2 pressure gauge is the fix I'm looking for (for now).
Thanks!
 

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Yes, smartdigger is right. My point sort of was, one goes out the light goes on. The next goes out the light goes on. It's a sort of all or nothing system
Checking your tire pressure every week or two is a low tech solution.
My other smart has all up and running. When the tpms fails (and they all do eventually) I'll probably just keep on check'in every week.
 

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Discussion Starter #8
The thing doesn't even tell the temperature. Makes sense for now just wait until the tires need to be replaced and do the everything all at once.

I like SmartDigger's idea to get them tested, but it also makes sense that even if one goes, chances are the remaining 3 are not that far behind.

Thanks everyone for the responses and crash course 101!!
 

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Discussion Starter #10
Rubyg:
I've been trying to learn more about this (thanks to all that pointed me in a right direction), and it looks like the answer is no. And honestly I'm beyond shocked for all that it takes to correct depleted $3 battery!!

It's a good thing that malfunctioning tmps won't fail you at an inspection (at least for now), but in all honesty there's gotta be a better way to deal with this problem. I'm all for doing my own maintenance spark plugs/bulbs/oils/fluids/etc, but this is not something I can pull off in my garage.

The cheapest sensor I was able to find is about $60ea
 

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Check with Tire Rack, Last set of tires I got from them, they called because of the size mismatch to verify that was what I needed and I asked about TPMS. I was told I could get them for around $30 per sensor, and they have worked great for the last 4 years now.
 

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Discussion Starter #13
And one more question in an opposite direction. Would pulling tpms fuse kill the dashboard telltale?
 

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Discussion Starter #17
I didn't have to program mine, just put them on and the system recognized them.

a piece of electrical tape (black) would cover up the light
New sensors? That's weird. They all transmit at 433mhz, so if not paired then car would be picking up signal from any nearby car with same band tpms, no?

Yeah, black electric tape is the way to go for now... used it a while back for the annoying passenger airbag light, so it's on my dashboard now too. just got back from the garage :)
 
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