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i have replaced all four TPMS with aftermarket ones (ebay). the website recommended 433Mhz but the system does not recognize them. we aute and erased all error messages l but the displays keeps saying "no sensors available".
is it possible the car/system uses 315Mhz or am i doing something else wrong?
european cars 433mhz, the fact the display has an F for temp units means its likely its a 315mhz car
I coded one of mine as a duplicate of the other in error - none worked but I didn't ever get that message (none worked is a total lie -in diagnostics all 4 worked just fine with readings and recognised. but the cars brain said it can't get the position of two, so it pretended to be waiting on the info. So it just read what you see from a cold start before driving off - "readings will be displayed in a few minutes" - 4hrs on still said it - as soon as I recoded the duplicate to what it was meant to be, all four came to life exactly as it used to on the other set of wheels..)
May I ask what the model of Aurelia tool you were using ?
Mine took 10 miles of driving to show 3 wheels reading but the rear right wheel has no reading.
Thanks
You don't program these. If yours isn't reading, replace it. It's probably the batteries. You should definitely replace all 4. If one went out, the others aren't far behind. If this coincides with a tire replacement, it won't be an extra labor expense.
autel are a third party - they were one of the first to build their own better than std TPMS sensors - further dev now see's one unit that be be programmed to either 315 or 433 mhz so you just need one sensor (per wheel) and you have no issues at all...
basic manu sensors come with a fixed code for some brands that must be written back to the car's brain - but every manufacturer does it differently and mostly try to stop you - attempting to ensure its dealer equipment only that can write to the car - autel tools (of the correct type) can do either, write to the brain or easier and more suitable for people working with many brands of car - just replicate the codes the car came with - the car can remain unmolested and you get an easier life - they are about $40 each for the dual frequency sensors
but people here claim it can magically programme the car with a Merc sensor - not sure how that can work reliably - why wouldn't it just pick up another mercedes sensor in a carpark beside you and adopt that code when you start the car ?
to code the car or sensors you can get high end TPMS only tools that will do this - or buy more specialised high end diagnostic tools - but many of these only add full TMPS capability on cut down versions of their diagnostic tools - Autel for the home motorist do a USB pad to sit their sensor on for $60 - with their free software you can code the senor to whatever brand car adding the stupid manu programming - then add any code you fancy - this is a MUCH better way - as duplicate sensors in another set of wheels means for track days or running winter tyres on a different set of rims you have less stress
I have seen people here, on Ford forums and people with BMW bikes claim the vehicle can just learn new sensors - but I have in practice never witnessed anyone do this in reality and its certainly never worked on any vehicle I own
I read through this post but didn't see anything about true PSI readings. Mine (08 S550) work but can be 3-4 PSI off from a gauge reading. Of course it's a "little" hard to do a hand held gauge reading while driving down the road so there's a few minutes time difference between the gauge reading while parked and delay needed for the TPMS to "wake up" and display PSI. Out of curiosity, TPMS reading would work in other cars (Audi) while it was sitting in my garage. Why does it require Benz to be driven a few miles before displaying? Also any amount of rolling resistance will cause the air in tires to warm up raising PSI making it hard to get an equal reading between gauge and TPMS reading.
two methods to help the driver understand if the tyre pressure is dangerously incorrect
direct - aka individual TPMS bluetooth sensors in each wheel give live data to the car when operational
indirect - aka make it up from wheel circumference, guessed from ABS wheel speed sensors and much loved by VAG
in 2012 the law in europe outlawed the fake joke idea - but lobbying by the likes of liars within Audi fiddled the laws by 2016 to allow rubbish
the second point about accuracy needs to be in context - cars are driven frequently between -10C and 38C, the pressure difference in a tyre withing this temp range is way more than 4 PSI - so the sensors have temps sensing within, (that real vehicles will display to the driver as an additional safety feature) and it fakes the reading you see taking tyre temp in to consideration, to both give a more stable reading but to help you understand what matters
03-09-2023, 04:28 PM
