986 boxster grinding, shredding metallic sound

[Astarael]

Hello there, this is my first post here and I’m writing because of problem with my boxster.

Today in the morning I’ve started my 2002 boxster and noticed strange sounds from the engine/ rear side of the car

It’s a metallic, grinding sound like a loose piece of metal or something like that

Sound disappears when you press gas and comes back once you loose the pedal, I don’t know if it changes while engine is warm

 

Also, check engine light shown up yesterday, when I connected my BT OBD2 there was no error code.

I came with that to workshop also, and they said it’s a catalyst efficiency error.

 

I’ve had that error code a while ago, I’ve replaced mass air flow meter and check engine light disappeared. 

I think it might be a problem with maf again because I bought not the cheaper, not the original one, but why are there these strange sounds? I’m worried about this. Could it be catalyst this time? Or again should I replace maf? This time I’ll buy original one.

 

 

 

here are two Videos I made

 

 

 

 

 

Also I’m sorry if you can’t understand something, my english is not perfect.

Thank you for all replies, I hope we will solve that problem together

[wizard]

Hello. Based upon what your workshop has said, it's likely a disintegrating catalytic converter. However, check that the heat shields on the exhaust are firmly attached first.