Approx. 30 miles after SP2 install, getting 03/04 (knock sensor) and 07/07 (rear heated O2). Is it likely they did not hook up my rear O2 during the install (are 97's on the cat?)? Is the 03/04 code a phantom code based on the 07/07 error?

Thanks for your help

 

KS code is being caused by the o2 code. Pull it and clean it...if they got antiseize on the sensor, it'll throw a code. I used throttle body cleaner to clean mine.

 

That sounds like a good idea. Also its possible that if the o2 was never replaced its about time for that.

 

For the 97, is the O2 on the cat?

 

No its not.

 

pull your rear o2, clean it, put it back in, reset ecu and wait.

In the mean time, pull of mud flaps, sand, prime, paint, clear
I think it would look great on your max

 

Yeah, those black mudflaps look really weird on your Max. Whatever floats your boat.