Crossposted from the Aem forum. Just trying to see if anyone has went through this.

I have a 2003 Evo 8 using AEM version 2 ecu with the 30-0300 wideband installed 2.5 weeks ago. The sensor is exhibiting what I've come to see as a failing oxygen sensor. I just installed this new wideband as I had the 30-4110 wideband and it was going through oxygen sensors about once a month. The car is pretty modified, running on E85 with 2100cc injectors. Under normal use, the car starts and idles at 12:1 a/f ratio until warmup, and then idles at 14:1 due to size of the cams. The oxygen sensor sits at 9 oclock on my downpipe, about 24 inches away from the turbo.

My question is, is there anything I can do to stop this usage of sensors? Once installation of a new sensor, car runs absolutely beautiful until this occurs again. Any ideas?

 

Is the O2 sensor heater circuit working properly? If the heater isn't working sensors don't last long.

 

I guess I dont know how to answer that. These are Aem gauges/sensors, and never have an issue until they start to fail. I never see a sensor error, or heater error. Is there something I should check?

 

Make sure the heater power and ground have continuity, and make sure the power has voltage when you turn the key on.

 

Looking at the wiring, are you saying the power and ground to the gauge need checked? The gauge connection to the wideband has no power and grounds to hookup, and merely connects in the back of the gauge. I bought a new wideband thinking the old ones internals were the culprit, and with this one dieing almost faster, Im kind of at a loss.

 

Measure the current being thrown through the heater circuit. If you have good current flow, you will have a good power and ground.