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I just put in a new front O2 sensor and my light went off for a minute, but now it is back on with a P0135. Any ideas?
 

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if you have OBD2 reader,,, you could reset it and wait till it comes on again..I have that readings before and when I reset it,, it did not show again..that was 3 weeks ago already and hopefully it will not show up again
 

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Are you sure it was the sensor and not a freyed wire or bad connector. That code is for the heater part of the sensor. Did you use a direct replacement or did you buy one where you have to solder the old connector to the new HO²? Did you get an ACDelco?
 
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