Soe I had a code for the knock sensor bank 2 so since I had to take off the intake I went ahead and replaced both. Unfortunately once finished used the scanner and found that now I have a code for bank 1 smh. So I ordered another one and put it on and now I have a random/multiple misfire code on all cylinders, any suggestions I am mechanically inclined so not really worried about the work if any but really just need to fix my car its really starting to get expensive at this point help please.

 

You buy eBay sensors or Lexus one from a dealer or Lexus parts now? If you don't buy at least NTK from rock auto you will have issues

 

Did you torque the sensors when you installed them? Real strange that the ecu is complaining about the front sensor after you did the rear. Most people say to replace the knock sensor harness while you're doing this job.

 

If you took off your intake and now have random misfires, sounds like the intake may have a leak as a result of R&R. Side note, but maybe related, my VVT solenoids caused random multiple misfires, but you would get a code for that too.

 

Have you swapped the old component back in?
A earlier post brings up an excellent point, There is a lot of real junk components on ebay and Amazon that will either not work at all, or produce different issues than the ones already present.
Be really wary with regard to the quality of the components purchased.
One can avoid the big buck OEM Lexus branded parts yet purchase the exact part without the magic Lexus brand on it and not compromise quality one iota. I like Rock auto too but avoid their cheapo stuff mostly. A great example is when you need front hubs, Rock has the OEM same part lots cheaper no quality compromise.
Carefully inspect your harness and esp. the connectors the harness can be wrung out with an ohm meter. Look for broken insulation or cracked / pinched conductors.
Be sure to use a little Silicone dielectric grease when reassembling, it will both help seal the connection and really help when next time comes for disassembly.