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hey guys so I have a 2012 Subaru wrx and I recently had my clutch swapped out, sparked plugs changed, coolant flushed , etc. I assume these guys pulled the engine. now when I got the car back it threw a code of p0031. I checked the fuse and it was blown so I put in a new one, now im pretty sure that means that I need a new front o2 sensor any thoughts. any recommendations on where to get it and part numbers?
 

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Ask the shop that did the work. They should give you details. Normally there's no reason to pull the engine. Removing transmission is easier. If they removed the exhaust to get access to something, they might not have plugged the o2 sensor back in correctly.

At minimum if a code pops up while they worked on it, they should check the wiring and tell you whether the problem is o2 sensor or wires going to it.
 
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