Engine control unit at the Opel Agila A 1.0 12V Twinport – position & expansion

Hello all, I have an Opel Agila A 1.0 12V Twinport – engine marking Z10XEP (built in 2005) and would like to know exactly where the engine control unit is located. I would also like to know how elaborate the removal is. Do you need special tools for this or can you do it with “normal” tools? In addition, the question is whether someone with the error code P1526 (mistakes with the actuator – throttle flap) knows? Unfortunately, this cannot be deleted and stays with different a throttle flap :/ Would I be happy about tips! Thank you in advance! Greetings, David