Hi,

I just got an AEM series 2 tuned for my MY04. I wanted to drive it for a while before deciding to keep it as is or go FI.

I have an Innovate wideband (LC-1) gauge, but it is currently not hooked up to the EMS, but that is my next step. My question is: if the wideband O2 sensor fails, how does that affect the EMS? I've been having some recent issues with my wideband, it frequently faults during normal driving, and the gauge will read the minimum value (~8). I haven't done any tests to see if it's a gauge issue or sensor issue, but I wanted to ask the forum if anyone has had previous experience with an failed O2 sensor while running an AEM tune. I have maybe 30k miles on this sensor...

I may end up getting a new sensor, or just replacing what I have with the AEM UEGO.

Thanks!

 

It all depends on the settings in the AEM...you can hook the wideband up and use it for data logging purposes only, so if it fails there will be no change at all. Or you can select to use it for closed loop lambda control (the ecu reads the sensor and corrects based on its input) which would have an effect on fueling if the sensor was providing faulty data. If you think the sensor is not 100 percent reliable I'd recommend just logging it and not relying on it for closed loop operation.

 

thanks.

is it not very typical to set up the AEM with closed loop lambda control? my tuner recommends it, and from what i understand, the AEM does not accept the stock narrowband O2 sensor input (0-1V) for closed loop feedback. is this correct? perhaps i just need to call AEM and ask if there's any fault detection strategy employed in the AEM series 2 in order to take action (ie. disable closed loop control) upon detection of a faulty O2 sensor.

no sensor is 100% reliable, so i'm just trying to weigh the pros & cons of having OEM-like (or better) closed-loop control, or sticking with open loop.

 

Not sure about the 0-1 volt ability and fault detection on the ems, probably ask AEM or your tuner. I'd definitely recommend having closed loop control operating for the low load range of the calibration, if nothing else to improve fuel milage.

While no sensor is 100%, NTK sensors are damn close. I have found that widebands using NTK sensors are FAR less prone to sensor failure than those using Bosch.