does anyone know what the 433mz on the sensors means... is that the frequency that they send at...if so, then a number of different sensors will fit the .1 and the .2, i just saw a set of cayenne sensors with the same 433mz, and a couple of audi sensors...a scam on the part of beru and others to max profits?

 

Thats likely 433 MHz, which is a frequency. The carrier frequency that the transmitter uses.. and the receivers in the wheel wells are tuned to that frequency.. thats why you need to have the right transmitter modules for your car.

If you can find another part that works, use it. I'm sure part of the cost is to have the parts marked or stocked and stored with the PAG part numbers applied to them. I'm pretty sure the original manufacturer doesn't make a zillion different ones but a small set of variations that are used on almost all cars.

 

thanks minok, now does that mean that that is the freq that the sensors use to communicate with the car? there isn't some other variable in there...when i see the 433mhz on the sensor thats the important part, sorry for re-asking this, but i get conflicting reports from different places... the mechanic at my local PZ said today that there are different freqencies for the 997.1 and 997.2, just for instance, and i have a set of each in front of me that i had with me today, and he answered me like, instantly, like he really knew the subject...very convincing, and i have heard from others,and i have to say others that i can't verify as to reputably knowing what they are talking about, saying that these 2 different parts, 997.606.021.00(997.1) and 997.606.021.20(997.2) will both work in my .1 car, and come to think about it, one of these guys is one who tried/did sell me a set, the purportedly wrong set,thru ebay and i will be sending them back, and the only way to test this is to mount them in the car and go for a ride, as the car won't recognize and accept the sensors until they are rolling with the car and system for a few miles/minutes, whatever, and at probably +/- 100€, not worth it...anyway, whew...sorry for being so long winded, really would like to know which is which, thanks for listening, kk

 

The best answer to your question will come from your dealer when he matches your VIN to the correct part number.

 

and he did that, so for everyone, if you need it or care, the right part # for 997.1 is 997.606.021.00 and the new orange ones, 997.606.021.01 as well are .1 parts...997.606.021.20 is for 997.2, and that is the definitive be all, end all...and i now have those #s memorized... now, both of these parts, i have a set of each sitting on my work bench in front of me as i type, have 433 MHz printed on them as well as other audi vw sensors i have seen on ebay...what that means... i still don't know

 

What it means is that the frequency of transmission is only part of the story. It's like saying two people are talking over a copper phone line. It means communication is possible, which it would not be if one was holding a telephone and the other was holding a walkie-talkie or a banana. But that's only the beginning. It just means something can travel between the two. If one is speaking Czech and the other Mandarin, it won't be information, just noise.

I have no idea what 'protocol' the sensors use in different generations of Porsche, but I'd be very surprised if it were the same. Maybe the differences won't be as bad as Czech vs. Mandarin, but maybe Italian vs. Spanish. And simple-minded computers like these do not tolerate even the smallest difference in 'language'. You need the precise protocol or they give up.

All that has to match as well as the frequency. That's why you need a Porsche part number and either a Porsche part or someone else's part that claims compatibility with that specific part. 433 MHz really is useless without more information.

Sometimes ordering a Porsche original part is the only practical way to avoid hiring a consulting engineer.

Gary

 

thank you gary, well and simply put for one who looks at electronic stuff like it is mandarin, i send back the .20 sensors and use my originals that still have 37 months of life left...i am thinking i will have this x-51 for awhile, though one never knows, the cabs are tugging at me, maybe an x-51 cab...come to think of it, i don't remember having seen one of these, anyway, again, thanks for the clarification...go to bed...

 

Ditto to what Gary said.

The 433MHz is the carrier frequency for communication, its exactly like the radio station (98.1MHz) for FM. the sensor broadcasts on that channel, and your car can listen on that channel.

However, another important part is can the two (sensor and receiver) actually communicate? You can tune in your radio to 98.1FM but if the DJ is speaking Norwegian, you are not likely going to understand what he's saying. Similarly, the sensors and receivers have a transmission protocol they follow in how they communicate ON that 933MHz channel, and that must ALSO AGREE.

So as should be clear now, having the same carrier frequency as the car's setup is one important requirement, but not the only one. Best to rely on what the dealer finds out for YOUR car.