TPMS sensors
Joined: May 2010
Posts: 74
Likes: 4
From: Holland, Ohio, USA
Re: TPMS sensors
Hi Dennis @DTMenace -
Just curious: what are the manufactured on dates for the 20028 sensors you are offering?
As others have noted, Schraeder has replaced the 20028 with a later version. As others have also noted, later TPMS sensors stopped using a magnet to trigger a signal, instead use a seemingly pretty universal LF (Low Frequency) radio signal from a TPMS tool to get a reading.
Each sensor has a small circle with numbers and an arrow molded into the plastic. I saw sets offered as "New" on eBay from a seller in China which had date codes before 2010. Very likely those would work - for a while. But not as long as some with fresh batteries.
Just curious: what are the manufactured on dates for the 20028 sensors you are offering?
As others have noted, Schraeder has replaced the 20028 with a later version. As others have also noted, later TPMS sensors stopped using a magnet to trigger a signal, instead use a seemingly pretty universal LF (Low Frequency) radio signal from a TPMS tool to get a reading.
Each sensor has a small circle with numbers and an arrow molded into the plastic. I saw sets offered as "New" on eBay from a seller in China which had date codes before 2010. Very likely those would work - for a while. But not as long as some with fresh batteries.
Senior Member
Joined: Apr 2006
Posts: 2,509
Likes: 206
From: West Chester, PA.
Re: TPMS sensors
Hi Dennis @DTMenace -
Just curious: what are the manufactured on dates for the 20028 sensors you are offering?
As others have noted, Schraeder has replaced the 20028 with a later version. As others have also noted, later TPMS sensors stopped using a magnet to trigger a signal, instead use a seemingly pretty universal LF (Low Frequency) radio signal from a TPMS tool to get a reading.
Each sensor has a small circle with numbers and an arrow molded into the plastic. I saw sets offered as "New" on eBay from a seller in China which had date codes before 2010. Very likely those would work - for a while. But not as long as some with fresh batteries.
Just curious: what are the manufactured on dates for the 20028 sensors you are offering?
As others have noted, Schraeder has replaced the 20028 with a later version. As others have also noted, later TPMS sensors stopped using a magnet to trigger a signal, instead use a seemingly pretty universal LF (Low Frequency) radio signal from a TPMS tool to get a reading.
Each sensor has a small circle with numbers and an arrow molded into the plastic. I saw sets offered as "New" on eBay from a seller in China which had date codes before 2010. Very likely those would work - for a while. But not as long as some with fresh batteries.
The Schrader 20028's were purchased from Rock Auto in 2019, when one of my sensors died. In the meantime, I decided to disable my TPMS system on my SRT6 since I check the air pressure at least once a week. I had the sensors checked by my MB shop and they are fully functional.
Regards,
Dennis
DTMenace
Joined: May 2010
Posts: 74
Likes: 4
From: Holland, Ohio, USA
Re: TPMS sensors
Thanks @DTMenace - Still interesting to know how old those TPMS sensors might be. Since they are outside the tire, could you look for the little circle date code on them?
The check your MB techs could do on the sensors is the same as my little TPMS tool can do, that is trigger them with the LF signal and see if they respond. Or maybe the sensors you have are a new enough vintage that they also report a "battery strength percentage" - which is pretty questionable, for any battery. My experience has been that TPMS sensors which have lost enough battery power that their signal will not reach to the Crossfire TPMS module by the mirror will still make a fine reply to a TPMS tool a few inches from them.
When were your 20028 sensors made?
The check your MB techs could do on the sensors is the same as my little TPMS tool can do, that is trigger them with the LF signal and see if they respond. Or maybe the sensors you have are a new enough vintage that they also report a "battery strength percentage" - which is pretty questionable, for any battery. My experience has been that TPMS sensors which have lost enough battery power that their signal will not reach to the Crossfire TPMS module by the mirror will still make a fine reply to a TPMS tool a few inches from them.
When were your 20028 sensors made?
Senior Member
Joined: Apr 2006
Posts: 2,509
Likes: 206
From: West Chester, PA.
Re: TPMS sensors
Thanks @DTMenace - Still interesting to know how old those TPMS sensors might be. Since they are outside the tire, could you look for the little circle date code on them?
The check your MB techs could do on the sensors is the same as my little TPMS tool can do, that is trigger them with the LF signal and see if they respond. Or maybe the sensors you have are a new enough vintage that they also report a "battery strength percentage" - which is pretty questionable, for any battery. My experience has been that TPMS sensors which have lost enough battery power that their signal will not reach to the Crossfire TPMS module by the mirror will still make a fine reply to a TPMS tool a few inches from them.
When were your 20028 sensors made?
The check your MB techs could do on the sensors is the same as my little TPMS tool can do, that is trigger them with the LF signal and see if they respond. Or maybe the sensors you have are a new enough vintage that they also report a "battery strength percentage" - which is pretty questionable, for any battery. My experience has been that TPMS sensors which have lost enough battery power that their signal will not reach to the Crossfire TPMS module by the mirror will still make a fine reply to a TPMS tool a few inches from them.
When were your 20028 sensors made?
There is NO circled date on these monitors. You have many questions relative to the age of the ones I'm offering for sale, that I can't answer you or guarantee "fresh" monitors to you at this time, since I bought them in 2019. My suggestion for you is to buy "fresh parts" from a supplier to calm your fears of NOS parts, such as NEEDSWINGS.
Regards,
Dennis
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