Downstream O2 sensor replacement

MrsZR7

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2003 Mazda Protege5
I've been having a P0037 code going off for a few weeks, and finally got the cash to spare to buy the new downstream sensor - a Bosch direct replacement, not a universal. Anything I should need a heads up on before I attempt replacing this thing myself? Any tips and tricks to share would be appreciated. Thanks in advance!


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They can be seized up pretty tight,...

They can break free easier if the exhaust is hot,..

You can cut the wires off the old sensor to use a regular deep socket, then a regular wrench to install the new one.
 
you can also go the the auto parts store.

the also have a special socket made for 02 sensors removal. it has a special groove
 
We got it installed without too much trouble. The lower heat shield (I guess that's what it is) was in the way, but we cut the wires and ended up getting it off with a deep well socket.
My worst fears are over - the installation of this part has solved the CEL issue. [emoji2]
Now, on to the next project....that damn squealing noise. I just had all the belts replaced, and it's still squealing but not quite as much as before. It stops once the engine is at operating temp.


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