Seat Ibiza 2015 p334a and p334b

[Is this right]

Hi wonder if anyone can help.. Epc light came on. Turned engine off and back on light would go then gradually started coming on more frequently and the engine light came on. Bought a elm327 and got the code p334a looked at the instructions on here and opened the actuator up ready to grease but it wasn't rusty or dirty and sensor could move freely. The bar thing on the actuator moves by hand but doesn't move when the ignition is on or when you put gas on. Do I just need to replace the actuator? How do I find the correct part no and once I change it do I need to somehow commission it? If so can the elm327 do that? The p334b only came on after I had opened the actuator up and put it back. Hoping this will disapear when a new actuator is put on? I was supposed to be selling it at the end of the month 😭 bad timing. Thanks in advance