drfriskerI had AEM and my tuner told me that AEM widebands are known to be off by at least 1.x lean. I've also read on Honda-Tech from other tuners who had the same issue with them. AEM gauges are nice but I didin't like that it wasn't reading correctly.
drfriskerI personally experienced this. When my tuner said my AFR was off, I went to the forums and asked if anyone had similar issues. There was a tuner who replied where he had customers with AEM widebands that didn't read correctly in 2 out of 10 cars (he says he tunes about 15 cars a week).
For me when I switched my AEM out for PLX the AFR readings were consistent between my tuner's reader and the PLX. Nothing changed in my setup... same mods, same tuner, different wideband. I was in disbelief as well because I know AEM is very well known and I would never doubt their products.