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My 2008 GTI has been giving me codes P0030,P0130,P0131,P0135,P0299
So I changed the O2 SENSOR(upstream) and now its showing codes
P0131,P0299
My car has now started to sound like its knocking(but it's coming from back of motor)and i think it's the catalytic converter that's making the sound.
It's been almost 5 weeks since i changed O2 Sensor, and the knocking has been getting more noticable each day.
The effin O2 Sensor was $200 to replace, so I dont want to have to replace again.
Could i take Cat off and hollow it out, put back on ? And if so, do I need anything special to run it like that?
I just dont want to do this and find out I effed it up somehow.
 
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