Wideband O2 - AEM X-Series

triple_octopus · 2025-09-16T09:03:21-0400

Hi all, I just got a wideband gauge and looking on how to install it. Most older posts were a little bit vague and I don't want to fuck it up. What is the best source of power to power the gauge? Also what is the best placement for the sensor with my Y pipe as it merges the 2 headers a bit late (over the steering rack) and I have a valve that opens right after the Y pipe merges and so if I put the sensor in the exhaust before the cat I won't be able to get readings when the valve opens and if I put the sensor right after the valve I won't get readings if the valve is closed but I want to be able to see the O2 readings both ways so would it work if I put the sensor right when both headers merge? Or would it be better if I put the sensor on the front header and take it for granted that the rear header will be the same?

P.S: Saber check your DM

Sabertooth^2 · 2025-09-16T09:11:12-0400

Power for my gauges I pull off the 12v outlet circuit in the cabin

Best placement is 12-24 inches behind the merge pipe, being NA you want to be on the short side, and high power FI far. So about 12 inches from the merge is great on these. There's room without your valved setup, but be careful not to hit the floor when the exhaust moves or it'll rattle. Also be sure the sensor itself faces downward to some degree so water condensate doesn't run up into the sensor.

From how you describe it, putting it a couple inches after the merge may be best if you have the space. If it's only reading on one bank's exhaust, you'll want to run two sensors to get the full picture as you may get a rich/lean condition on one bank someday, and it won't be affecting both. But a sensor after the merge shows you that one of the two banks still needs attention if not both. One sensor per bank is nice, but a lot of gauges.

triple_octopus · 2025-09-16T09:28:37-0400

My valvw is closed 99% of the time and so IDC if I can't get a reading when it is open. I will install it around 10 to 12 inches after they merge but there is one question I have. I am having trouble understaing what do you mean by downwards. The manual says to install it like this which seems to drop all moisture from sensor right into the element.

Sabertooth^2 · 2025-09-16T09:54:23-0400

Yes, tip downwards, wires up

triple_octopus · 2025-09-17T05:46:30-0400

Perfect. Which fuse do you usually pull off of? The cig lighter? I need the least noisy one

Sabertooth^2 · 2025-09-17T09:14:59-0400

Yep. There's only noise on that if you have something high power in the outlet with a wave pattern anyhow. And you don't need to share that ground. I just ground to the chassis.

triple_octopus · 2025-09-17T10:38:11-0400

Perfect perfect. Does mounting the O2 in close proximity to the high flow cat (but before it for sure) make any problems? Becauee in my exhaust if I put it at 12 inches it will be almost right before the cat.

Sabertooth^2 · 2025-09-17T19:21:04-0400

Before it but close is fine

Wideband O2 - AEM X-Series

Our Vendors

Top Contributors this Month

Recommended Communities