P1133 Chevrolet - just replaced sensor

Question

05 silverado 4.3 with dual exhaust. I had codes p0053 and p0420. Read into it and
It said to replace bank 1 sensor 1. Got new sensor plugged it in and cleared codes. This morning code
P1133 came up. Where do I start? Exhaust leak?
Truck runs great. Checked intake and there were no cracks. When I check exhaust there was no leak prior
to the sensor unless there is a bad flange maybe?
But that shouldn't throw the sensor off should it?

Not knowledgable when it comes to this kind of stuff
Just wanting some help

Answer 1

P1133 Insufficient switching Bank 1 Sensor 1

When you have a P1133 mean the number of transition are less.

Here is a 02 sensor with a good switching pattern

 

 Here is a slow switching pattern

What you have is a slow switching pattern or a insufficient pattern, There nothing  wrong with your engine management it is the 02 sensor that you have installed, If you have a aftermarket 02 sensor you get this code condition, (or a P1167)  The manufactuer wants their product in their vehicles.you need a OEM (original equiptment  manufactuer)