Need advice on tire pressure sensors - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 01-30-2008, 09:03 PM Thread Starter
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Need advice on tire pressure sensors

I am looking for my '08 S550 to arrive from the factory soon. Among others the car will have the AMG appearance pkg with 19" wheels. I intend to drive on these in the summer and purchase another set of 18" standard wheels from Ebay or some other way to use as winter wheels.

However, I am confused as to the tire pressure sensors. I understand that I can change out the sensors from the 19's to the 18's every time I change the wheels out but that this is time-consuming and labor intensive. Is this true??

Am I better off investing in another set of sensors for the second set of wheels than trying to trade them out every time?

If I don't put sensors on the second set of wheels will I get a constant warning light on the dash indicating that my tire pressure is incorrect?

What is cost of new set of sensors? Where can they be bought other than the dealer (which I assume will charge me an arm and a leg)?

Any advice on this issue would surely be appreciated.
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post #2 of 7 (permalink) Old 01-30-2008, 11:04 PM
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The tire pressure sensors are inside the wheel of course (kept in position by the valve). Moving sensors from summer tires to winter tyres and back would mean taking off the tire from both wheels at every change, this is no good idea.

You certainly should buy a second set of sensors. Note that this car would have Siemens sensors instead of Beru (it has been Siemens for a few years). You should find some price info from the W221 section.

I'm not sure about the W221 but I would assume you would get a constant (every time you start the car) malfunction indicated at the IC if you would not install sensors to the other set of tires (this happens on the W211 at least).
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post #3 of 7 (permalink) Old 01-31-2008, 08:38 AM
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The sensors on my 02 will only be recognized after they are programmed to the car with SDS. So if you had spare sensors in the other wheels you would have to reprogram each time you switched tires I think..?
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post #4 of 7 (permalink) Old 01-31-2008, 11:49 AM
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You are nuts driving your MB in winter. If you need winter tires buy a winter throw away car instead. That way it doesn't hurt as much when you play bumper cars on the ice covered winter roads.

My SLK is parked all winter. The E class only comes out on winter days when the roads are clear. Otherwise I drive a Ford Taurus as a target for others to aim for. We won't talk about the times I slide off the road all by myself.

Regards, John

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post #5 of 7 (permalink) Old 01-31-2008, 12:46 PM
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Originally Posted by JCFair View Post
You are nuts driving your MB in winter. If you need winter tires buy a winter throw away car instead. That way it doesn't hurt as much when you play bumper cars on the ice covered winter roads.

My SLK is parked all winter. The E class only comes out on winter days when the roads are clear. Otherwise I drive a Ford Taurus as a target for others to aim for. We won't talk about the times I slide off the road all by myself.

Regards, John

Safety is one important argument to drive an MB. Winter is when you may need more safety than otherwise. Of course you can pick up a different MB for winter from that for summer.

Considering new sensors, I'm not sure about the W220 but I assume also there SDS is not a must, it just makes the sensors operational immediately. If SDS is not used, it takes quite some time before the car learns which sensor is at which tyre but the car should be able to do that on its own, at least a W211 and W221.
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post #6 of 7 (permalink) Old 01-31-2008, 01:15 PM
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I have no knowledge how the OEM MB sensor works, but most of the manufacturers install warning system only, that will not display actual pressure. Is it the same on Mercedes?
I've been using PressurePro system on my vehicles for about 3 years. Intentionally for my motorhome, but with ease of changing the sensors, I am using it on my sedans as well. Can't beat checking the tire pressure at 75 mph.
PressurePro sensors are attached to tire valves and are self-programmable to the pressure it is originally attached to. Meaning when I take 20 seconds to move the senor from 80 psi motorhome to 35 psi car, I don't have to worry about doing any adjustments. The only thing to observe is position on the car, to have accurate display. Not that it is critical for warnings.
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post #7 of 7 (permalink) Old 01-31-2008, 11:19 PM
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I was not aware of this PressurePro product but from their web site I figured out they have products that also indicate the actual tyre pressure.

MB OEM TPMS always has the tyre pressures readable from the instrument cluster menu. But there is this later option, "tyre pressure warning system" that operates on ABS/ESP sensors and this one can only detect a puncture or a significant pressure difference, but no pressure readings.

MB OEM sensors even signal the tyre temperature but the IC menu does not show the reading (while an Audi with the same system does).
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