Help Not Reading Boost

[LakeSpeed6]

I have manual boost gauge that is reading normal but when I look at my cobb or my mechanics read tool my boost only reads between 4-6psi all the time. Would this be a bad boost sensor? If so where would I get a new one and where is it located on the engine?

I am also getting lots of knock retard under boost up to 5.2 would this be due to the boost not reading?

Last question. I have a 3" downpipe on the car with a high flow cat. Getting CEL for "O2 sensor slow response time bank one sensor 2" Could this just be since the exhaust is free flowing, or a bad/damaged O2 sensor? If it is a bad O2 sensor where should I order a new one?

Any help would be great. Thanks

 

[LakeSpeed6]

Anyone?

 

[KrGsMrNKusinagi]

I have manual boost gauge that is reading normal but when I look at my cobb or my mechanics read tool my boost only reads between 4-6psi all the time. Would this be a bad boost sensor? If so where would I get a new one and where is it located on the engine?

I am also getting lots of knock retard under boost up to 5.2 would this be due to the boost not reading?

Last question. I have a 3" downpipe on the car with a high flow cat. Getting CEL for "O2 sensor slow response time bank one sensor 2" Could this just be since the exhaust is free flowing, or a bad/damaged O2 sensor? If it is a bad O2 sensor where should I order a new one?

Any help would be great. Thanks

First what DP is it.. And if your getting a cell from sensor 2 you need to put a spacer on it probably.. I have had bad luck with manual boost gauges i have had 2 break so I bought a DEFI one.. Knock and retard might be from too much boost etc.. Im sure some others on here can help you more

 

[LakeSpeed6]

I already have a spacer on the O2 sensor. I think I will just try replacing it.
As for the boost problem. The manual boost gauge works fine. The Cobb AP which reads the factory sensor is not reading right.
Has anyone else had the factory sensor go bad?
And if so what did it read when it went bad?