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I just wanted to post here, because I was worried about this issue myself and hadn't heard concrete confirmation on what worked.
I obtained the external ez-pass transponder (afaik you have to call them to get it)... I took it to the Rockville SC and had them install it inside the nosecone (I don't have a front plate mounted). I wasn't sure whether they would do it, but aside from not quite knowing what I wanted at first, they had no qualms about doing it. I was also obviously worried that it just wouldn't be in a good position for the receptors to pick up it's signal.
I don't know about the 495 fastlane receptors, but I drive on the dulles toll road every day to / from work and it registers just fine. I haven't noticed it requiring a slower speed either, I haven't been keeping exact track, but I go through around 40-50mph and it's been registering fine.
Hope this helps anyone trying to figure out what to do (at least in the DC Metro area)
I obtained the external ez-pass transponder (afaik you have to call them to get it)... I took it to the Rockville SC and had them install it inside the nosecone (I don't have a front plate mounted). I wasn't sure whether they would do it, but aside from not quite knowing what I wanted at first, they had no qualms about doing it. I was also obviously worried that it just wouldn't be in a good position for the receptors to pick up it's signal.
I don't know about the 495 fastlane receptors, but I drive on the dulles toll road every day to / from work and it registers just fine. I haven't noticed it requiring a slower speed either, I haven't been keeping exact track, but I go through around 40-50mph and it's been registering fine.
Hope this helps anyone trying to figure out what to do (at least in the DC Metro area)
Racerx22b
@unplggdd on Instagram
I have the external sunpass mounted behind the nosecone. Works everywhere so far. Even for airport parking which is gate controlled. Pull up and it registers immediately. The Palm Beach SC recommended this as the best option. I had it installed at pickup and no issues since.
An EZ pass works fine for me at the top to the right of the rear view mirror and autopilot camera box. Including the high speed ezpasses.
Oddly the DS at Tesla told me it wouldn't work in the windshield. I read this thread and saw that people had no problems with placing it in the obvious place and they were right -- Tesla was wrong. Too bad for the many people who wasted time with nosecone and license plate installs if they would have preferred interior windshield mount b/c Tesla was telling them incorrect information.
Oddly the DS at Tesla told me it wouldn't work in the windshield. I read this thread and saw that people had no problems with placing it in the obvious place and they were right -- Tesla was wrong. Too bad for the many people who wasted time with nosecone and license plate installs if they would have preferred interior windshield mount b/c Tesla was telling them incorrect information.
Danal
electricmotorglider.com
North Texas Toll Authority (NTTA) EZ-Pass works fine jamed up in the corner on the passenger side of the mirror.
Now I have my answer! Mine is a SunPass also, plus the transponder for my parking garage.
majorlance
Member
I have a license plate mounted EZ Pass (secured to the front license plate, required in Maryland) and it works flawlessly. Ugly but not as ugly as my HOV lane sticker on the back... is there no style god at the DMV?? 
I also have a black transponder for my work parking garage. I tried to put it in position #3 (above from caps04) but the performance was spotty. I then took it apart and saw that there was an antenna on it, on one side. I oriented the pass so that the antenna was at the top, over the black dots, and it has been working flawlessly ever since.
Morale, the orientation matters when mounting it to the right of the rear view mirror. The dots don't have any shielding so that is where the device's antenna needs to be placed.
Good luck!
I also have a black transponder for my work parking garage. I tried to put it in position #3 (above from caps04) but the performance was spotty. I then took it apart and saw that there was an antenna on it, on one side. I oriented the pass so that the antenna was at the top, over the black dots, and it has been working flawlessly ever since.
Morale, the orientation matters when mounting it to the right of the rear view mirror. The dots don't have any shielding so that is where the device's antenna needs to be placed.
Good luck!
caddieo
Member
I have a license plate mounted EZ Pass (secured to the front license plate, required in Maryland) and it works flawlessly. Ugly but not as ugly as my HOV lane sticker on the back... is there no style god at the DMV??
I also have a black transponder for my work parking garage. I tried to put it in position #3 (above from caps04) but the performance was spotty. I then took it apart and saw that there was an antenna on it, on one side. I oriented the pass so that the antenna was at the top, over the black dots, and it has been working flawlessly ever since.
Morale, the orientation matters when mounting it to the right of the rear view mirror. The dots don't have any shielding so that is where the device's antenna needs to be placed.
Good luck!
Thanks for the tip. My community gate transponder is mounted in the dotted area but responds weakly. I have to get really close to the transmitter for it to work. Based on what you wrote, I got the guts to open it up, located the antenna, and noted that it was behind the big wad of Velcro that I used to fix it to the glass. I am going to re-orient the thing. If I don't post anything else on this topic after this, you may assume that the situation has improved. :smile:
chickensevil
Active Member
I can't speak for the D models, but my March 2013 car has it right at #3 in your photo, as close to the roof as I can get it and as close to the mirror I can get it, with maybe an inch on either side. works 100% of the time (as I have yet to get fined for it not working) and have had it there for the past 3 months or so.
I had to install inside the car because of it being a switchable transponder (HOV status to non-HOV) and it has correctly read while going at least the speed limit (I won't admit to anything faster) which in this case is 65 MPH. It has also been tested and works on the Dulles Toll Road at their gates (where you have to come to a near stop to allow the arms to go up).
arijaycomet
Member
This is good to know. I have an older style EZ Pass (Ohio) that is installed in position #3 in my 85D that I just picked up two weeks ago. I don't see the toll way regularly, but will be using the EZ Pass in 2 weeks (Reach the Beach gathering) ... keeping my fingers crossed it works where I have it!
Correction. At least one time where I noticed the red light, the ezpass wasnt read when in position three-- just rt of the mirror at very top. Concerning.
Can you post a picture of how you have it mounted? I've been waving mine outside like an idiot. Lol
Just got a 91FastTrak transponder and it didn't work on right side of rear view mirror. Got an external transponder at the same time knowing the windshield might have issues. Gonna try and see if external will work if I have it out on the dash if not I'll hold it out the window when I go by. Was told not to worry because they check your license plate. All Zero-Emissions vehicles are free on 91FastTrak but you still need to have an account.
Not the clearest but this is in the garage. If it doesn't help, I will take some shots when I am out.
Edit: One picture is turned left, but you get the idea. Don't understand why the upload doesn't respect the orientation flag. :cursing:
majorlance
Member
Here is a pic of the transponder to my office building. I took it apart and saw that the antenna was on the side. So orienting the antenna behind the dots was the trick. Works every time now.
(My EZ Pass is on my license tag. Works well but I would have put it on the windshield as caps04 did if I didn't have the garage transponder up there.)
(My EZ Pass is on my license tag. Works well but I would have put it on the windshield as caps04 did if I didn't have the garage transponder up there.)
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