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Catalytic converter problems

Ben123
in BMW 5 Series Forum

Featured Replies

Hi All, recently bought a e60 525I in what appears to be good condition..  However pretty immediately there seems to be a problem. The car bogs down under any sort of excelleration if under load.. Been to my garage who have checked the vanos system,  MAF and sensors on the camshaft.. Thé belief is it's blocked front cats..  They have disconnected the vanos which allows it to run without faults although massively underpowered.. 

If i plug the vanos back in,  it immediately faults and bogs down, even get some timing chain/valve  noise around 3000rpm. 

 

Question is,  does it sound like a cat problem or vanos related? The difference is quite dramatic, if unplugged it's slow,  but plugged In its undrivable..  

 

Shame as it's a nice car otherwise and at 110k miles should have plenty of life left In it..  Grateful for any suggestions.. 

 

Many thanks Ben 

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