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how difficult is it to replace the front o2 sensor?

I get a obd2 note about the front sensor on the ecu+ piggy.
 

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o2 sensors usually arent hard to replace, though it is needed to get an o2 socket unless you are taking the downpipe off already. The only real problem is if the sensor is rusted and seized in the pipe. then its just a fight.
 

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It's doubtful that the code means the o2 sensor is bad. I forget what it is, but there is a very common thing that triggers a front o2 sensor code. What was the code number? If I know that, I can probably find the cause (and fix).

messing with the o2 censor wiring is a pain because its so fine if its not done right it will slip right off.

my boyfriend is working on that today in san antonio.
 

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please tell me you guys didnt buy a universal fit o2 sensor that you have to cut and splice the wiring?!? I guess they will work, but why not spend a little more that plugs in correctly?
 
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