I am working on a 2001 SLK230 with my father and we have been pulling our hair out trying to resolve a CEL. The codes are P0243 (Wastegate Solenoid A Malfunction) and a P0410 (Secondary Injection System).

So far, we have done the following to the car:

- Cleaned MAF

- Verified all clamps are tight and no cracks in piping

- Replaced Recirculating Air Flap ( AKA Air Bypass Valve)

- Replaced Secondary Injection Check Valve (PITA)

We cleared the codes, drove the car for about 60 miles and the CEL came back on throwing the exact same codes. We cannot get this car smogged unless we resolve this once and for all. Previous searches here have revealed that leaking cam sensors can cause all sorts of electrical problems. We have inspected the sensor and the wiring and found no traces of oil (thank God). Are there any other options I am missing? One big one is that we aren't sure if we did the air flap learning procedure correctly.