Good Afternoon Everyone,

I keep hearing that the secondary air pump can be purchased from Bosch or Mecedes Benz. Does Bosch make the pump? I am also hearing crossfires and mercedes use the same one. My stealership told me that the voltages are different and that a mercedes pump cannot work in the crossfires. Is that hog - wash?

Whats crazy is I took it to another dealer and the dealer told me the pump was coming from mercedes. wha?? Which one is it?

I have been trolling the forum and have done some of the preventative measures. I have taking out the check valve. I used pressurized air on it. Air seem to go thorugh but when I shine a light to it I cannot see through. Does that mean it is clogged still? Are you supposed to see clear though the check value?

I put the check valve back in and the CEL came on again after a little while. I actually heard the air pump blow once.

I am not sure if it because the old check valve is clogged and I just need a new one or if it is just the pump. I want to rule out all mulligans.

I checked the relays and no fuses were blown out. I read that maybe if the pump is drawing alot of current this may happen. It was from one of the post.

Please help... I feel like i am getting close to the CEL culprit but need the great minds of the forum to chime in and give me a some guidance..

Thanks for any advice in advance.