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Hi im kevin can i just confirm it was p3018
If so you need to replace the bank 1 sensor 1 lambda sensor .this is the first lambda sensor on exhaust the closest one to engine on manifold
Let me try and find image
Ok heres a link to page you only need to worry about sensor 1 instructions
Thats the one ,the easier one to replace
No problem please rate my service and let me know if you need anything else at all