New to forum and XC90 has an issue P0420

mrbeardie

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City
Perth
State
Non-US
Country
Australia
What I Drive
66, 122. 91, 240 & 2016 XC90
#1
Hello and merry Christmas!
Hi Guys, As title suggest my XC90 T6 keeps on throwing this code, I have replaced both the O2 sensors, also removed the cat to check if it was blocked or cracked and ran a penrite cat cleaner through the system, when I removed the cat I did find the retaing clamp between the cat and turbo was snapped the straining strap at the back.
This fault has been a niggling one for the past 6-8 months, no real issue other than the engine check light.
I have also replaced the pcv diaphragm and Volvo replaced the plugs about 6 months ago.
One thing that sounds strange is it sounds like a sewing machine.

Has anyone got any more thoughts of what I can look at before I try a standoff boss for the O2 sensor.

Cheers
Gav
 

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