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Discussion Starter · #1 ·
My 1997 escort has a trouble code: P0133 which shows o2 sensor need to be replaced.

I know the location of this sensor is on the front of exhaust manifold, but I dont know which kind of sensor I should buy?

POST CATALYTIC CONVERTER or PRE CATALYTIC CONVERTER?

Any ideas? Thanks!
 

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Pre catalytic. Its the one with the shorter wiring harness. I have heard the only difference between the two is the harness length.
 
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