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Rear Knock Sensor Replacement on 850 Turbo 850 1994

Hey gang, I'm getting a 4-3-3 from my check engine light, which tells me I have a bad Rear Knock Sensor. I looked in my Haynes manual to see what I was in for to replace it - but it didn't tell me much. Has anyone out there replaced one before? What skill level would you rate it (1=easy & 5=hard)? I found the part pretty cheap online....but want to make sure this isn't an impossible repair for a weekend wrench turner like myself.
Thanks in advance to anyone with thoughts and pointers.

QuickBrick (James)
94 855T
93 245 (M47) FOR SALE
91 780T






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