Hello guys, it’s me again. My car makes buzzing noises at the start of the cold. The workshop read out the error and said that the cat is defective… A nice member gave me the tip to check the secondary air pump or replace it. Bloss now comes my problem – where can I find it? I have already looked for pictures on the internet to search for them in the engine room. Without success. Can you tell me where to find them and if the Citroen C1 a such pump at all? C1 II 1.2 vti 82PS BJ. 10/2015 Driving performance: 124,000Km Best regards