i have a digital a/f gauge in my 2009 ss/tc and about two months ago it started to malfunction and im not sure what is causing it. when i first start driving, it reads fine but after usually a 1/2 to a mile of driving it goes to 20.0 for a second then 50.2 and stays around 50.2-50.3. i read that dirty o2 sensors are uncommon but i dont understand why it works initially then starts to malfunction. it seems to happen quicker under harder acceleration also, if i drive very conservatively it can work for longer. any ideas? its important for me to track my a/f ratio while i drive because i believe i have a vacuum leak somewhere

 

what is the brand? i know some like my innovate lc-1 need to be calibrated every so often

 

not sure of the brand, but its a very simple gauge. its rectangular in shape and has just a digital readout only. nothing fancy like a lc-1

 

oh i dont know then. it could be a bad sensor though, but id wait for some more feedback from others before you drop 70 bucks on a new sensor

 

yep, i hope somebody chimes in. thanks for the help tho

 

Check the connection to the sensor first for water intrusion ,corrosion etc and apply some dielectric silicon to them for protection.
They work on such low voltage any change in resistance could affect it.

But it does sound like the sensor is buggered or contaminated with crap.Im not sure what you could clean it with or if you can at all.
Pull it out and take alook.

 

I have an AEM wideband and it kinda does the same thing. It will bounce back and forth between its highest and lowest reading constantly. Im thinkin bad sensor but im going to check all the connections too.

Another possibility for me anyway is the that my wideband bung is right in line with my 2nd O2 sensor about 4 inches behind it so there maybe be some "turbulence" causing it to read wrong.

 

ngk powerdex afx also needs calibration, but it only reads 9-16 so i think you have something else

this one?

 

alright ill have to take a look. and rootbeer, its similar to that but its smaller

 

I have an aem wideband gauge and for the longest time my would work then after a while of driving like 10 minutes it would just crap out and sit 14.7... eventually it just stopped working all together and sat at 14.7 all the time. I picked up a new sensor and popped it in and it works now, maybe same type of deal. sensor going bad

 

I just installed mine (AEM) a few days ago. And brand new right out of the box it bounces around a lot. Under normal driving/cruising it constantly bounces between 12.5 and 15.5 but when I lay into the accelerator the reading drops to 10. IDK if it's supposed to be like that or what

 

yea ur sensor is fine if thats what ur asking.. i assume ur N/A with mods and not tuned? thats why ur running really rich when you gun it. usually when ur at crusing speeds ur AFR should bounce around but 12.5 is a little rich but nothing u cant fix with a tune

 

I have TVS, header + full exhaust, dual pass + opt b, 80 lbs inj, trifecta tune, and a bunch of other stuff but basically no not stock

 

Yes that's normal, the car is trying its best to stay @ 14.7 so it tends to bounce rich-lean while cruising

 

yea its normal

 

cool! Thanks guys