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Interesting update. I got the sensor from the local place today. I am very confident that the 3 I had received prior to this are indeed fake. the Bosch sensor says "Bosch LSU4.9" laser engraved on...

I have actually read 2 or 3 of the links you put up and thats what made me start questioning the authenticity of what I have. According to these all 3 of my sensors are fakes. both units from AEM...

Well it doesn't matter because I never used it.

Well I purchased a $120 replacement sensor from a local store. It should be in tomorrow. At least this way I can look at it before accepting it. I am questioning if the 3 sensors I have had problems...

The sensor looks new, just slight discoloration on the stainless due to heat but nothing that alarms me.
The engine is a new GM unit with maybe 500 miles on it that has only been opened up to...

What am i missing here?

I purchased an AEM 30-4110 to aid in tuning my truck and have gone through 3 sensors in about 2 months. I contacted AEM after the first failure and they had me do some...