Hello all, I'm new to this so here it goes! Im working on a 96 passat that sat for 2 years. I put in a new heater core, and electric water pump. The car drives smooth and engine sounds great except for a slight knocking..It's like something is sticking. The problem I'm facing is the check engine light is on and giving me these codes:

P0411 - Sec.Air Inj.Sys. Incorrect Flow Detected

P0341 - Camshaft Pos.Sensor Circ Range/Performance

P0705 - Transm.Range Sensor Circ.(PRNDL Inp.) Malfunction

I replaced the Camshaft Position Sensor, but didn't change the codes popping up. I'm trying to avoid dumping much more money into this..but I need it to pass the emissions test. Any help is appreciated!!