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AFR gauge - Display the air/fuel ratio

AFR gauge - Display the air/fuel ratio

Postby D Max [OP] » Oct 06 2019, 8:41pm

Hello..

I bought an AFR gauge to have an idea if the engine runs OK..

I have to connect it to the oxygen sensor.
I see four wires on each sensor, 2 white, a grey and a black..

does these sensor have a heater inside, or is it just a high and low signal...

grtz, D
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Re: AFR gauge - Display the air/fuel ratio

Postby silentbravo » Oct 06 2019, 9:36pm

What gauge did you get? I don't know of any that tap into existing factory oxygen sensor. Typically they have their own wide band oxygen sensor that you install in addition to what factory sensors are already there.
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Re: AFR gauge - Display the air/fuel ratio

Postby D Max [OP] » Oct 06 2019, 11:08pm

The manual say connect to the Oxygen sensor....
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Re: AFR gauge - Display the air/fuel ratio

Postby Technik » Oct 08 2019, 4:03pm

You can connect a gauge to a factory narrowband sensor, however the data it provides you will be useless as all the gauge will do is cycle back and forth during normal driving.

I'd send that back and pick up something like the AEM wideband kits that run ~$200. They come with a proper wideband sensor that will give you a real idea of what's going on with your mixture.
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Re: AFR gauge - Display the air/fuel ratio

Postby D Max [OP] » Oct 08 2019, 8:33pm

Well, I just start with connecting it to the factory sensor, and maybe upgrade it afterwards to a wide and...
Anybody knows which wire?
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Re: AFR gauge - Display the air/fuel ratio

Postby Technik » Oct 08 2019, 8:35pm

Nearly all four wire automotive oxygen sensors are:

White/white: Heater circuit, resistor, doesn't matter how it's hooked up
Grey: Ground
Black: Signal

I'm telling you, unless you just really like staring at a gauge bouncing around on your dash, hooking a gauge to a narrowband isn't providing you any useful information and you're wasting your money. Just my $0.02.
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Re: AFR gauge - Display the air/fuel ratio

Postby D Max [OP] » Oct 08 2019, 9:49pm

Thanks

You're completely right, but I have this gauge.... I guess, if it bounces too much, I Will have to retune it with my hptuners mvpii
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Re: AFR gauge - Display the air/fuel ratio

Postby WalkersWalkers is online! » Oct 09 2019, 2:20am

Is this for your 2015? Why not just usethe torque app and read the O2 signal that is already there? Really, if you have no CEL then your engine is running fine, unless it wastuned to run crappy.
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Re: AFR gauge - Display the air/fuel ratio

Postby D Max [OP] » Oct 09 2019, 4:58pm

Torque app?
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