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How hard is it, (if possible at all) to replace the bank 1 sensor 1 mainstream o2 sensor on the Focus st? Really don't feel like removing the downpipes to take the o2 sensor off and don't really have the time to.
 

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How hard is it, (if possible at all) to replace the bank 1 sensor 1 mainstream o2 sensor on the Focus st? Really don't feel like removing the downpipes to take the o2 sensor off and don't really have the time to.
It can be removed without removing the downpipe, but it is not easy. You will need to soak it good with a penetrant and let it soak in for a while and you will need an O2 sensor socket. Take off the wiper blades, making sure to mark them for proper replacement and remove the cowl for access.
 
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