Emissions

Keatonc

Member
:
2001 Mazda Protege MP3
I put OBX headers on my mp3, obviously now it wont pass emissions in my state (mo) because of the precat. Although I did the non-foiler trick but it still reads bad second 02 sensor. Is it because my headers leak between the connection to the exhaust pipe? and how can i fix that as well. Thanks.
 
Sensor may just be bad, just get the cheapo universal one from autozone or look up how to do the resistor trick
 
Did you use one non-fouler or stack the two together? You have to run both to not get the CEL, otherwise the sensor is bad. I however do not recommend getting the universal sensor, spend the extra $20 for a plug and play it will probably last longer anyway.
 
im not familiar with that term, do you mean an OEM sensor? and yes i stacked the two. the codes says that it reads, and it is reading too rich of fuel. and do you recommend just re-installing the the factory headers and precat for a day and getting it tested?
 
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