Does SynGas affect the OBD2 port for other devices?

I ran into a different problem with mine. Left it in for about four months and it kept the port busy, but the bigger thing was my scanner wouldn’t even talk to the car unless I pulled the SynGas first. Not a physical blocking thing, more like it was hogging the line. So every time I wanted to check a code I had to unplug it, scan, plug it back in and let it relearn. That got old fast. Not saying it happens on every car, but on mine it wasn’t just a matter of both playing nice. If you only scan once in a blue moon it’s whatever, but if you’re plugging in regularly I’d expect some back and forth. That’s the part nobody mentions when they say the port is still there.

If you use the scan tool often, that port sharing would bug me more than anything. I ended up moving mine to a different car that I don’t scan as much, and that solved it for me.

Just unplug it when you scan.

I had mine in for maybe two months and used my scanner twice during that stretch. No errors, no weird behavior, just had to unplug the SynGas first. It’s a small annoyance but nothing more than that.

Mine’s been plugged in since last fall and I’ve hooked my scanner up twice without pulling it. Never had a problem. Maybe some cars are fussy but mine isn’t.

My experience is probably not what you want to hear, but I’ll give it anyway. I tried one of these OBD2 gadgets a while back, different brand but same idea, and the port situation was the least of my problems. It sat there fine, never interfered with anything electrical, but I also never saw the fuel savings they claimed. Ran it for about four months, tracked my fill-ups the old fashioned way with a notebook, and the numbers stayed basically flat. Your scanner will work fine once you pull the device, that part is simple. My issue is whether the thing actually does anything worth occupying that port. If you’re already getting decent mileage, I’d be skeptical it changes much. Not saying don’t try it, just don’t expect the port to be the dealbreaker. The real question is whether the device justifies the space it takes up.

If you actually need the port regularly, the SynGas is just going to be in the way. That part is real. But for me it’s not a hassle because I only plug my scanner in a few times a year anyway. Leaving it in is the whole point of these things.