Sorry if this the wrong forum, i just installed the AEM X series wideband, and it seems to run reacher than the stock which i see with the obd2.

 

On idle the aem shows for instance 14.60 and the obd2 shows 14.75-14.8.

 

Which is accurate?

 

Thanks

 

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There's quite a few factors that could cause a variation in sensor readings , including the fact that the factory o2 is narrow band and aftermarket sensors tend to be wideband .

Sensor age , is the factory position one the original. 

Sensor location , too close to the turbo can cause a much hotter and more turbulent gass flow .

Also if there's any leaks in the exhaust system between the 2 sensors locations could also cause a difference in readings .

My aem digital x wideband runs a bosh sensor (good quality) and has a preheat and calibration function to check the sensors readings . I normally do get regular dyno health checks just to be on the safe side though 

Mine also has bosh sensor with preheating ( i can see on the led screen it's written "heating").
I installed it something like 40 c"m from the turbo on the 6 o'clock.
And as far as i know there is no leaks from the exhaust.
Now on WOT i should look only on the aem and not the oem one that stops working on 11.2 and the dyno one that measure the gases from the back of the rear muffler m i right?

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Yep dyno afr is usually done via a probe in the end of the exhaust. the wideband o2 sensor should be horizontal or above . As this lessens the chance of moisture sitting or pooling in the sensor .