Cutted cat and second o2 sensor

turbokick

Active Member
Jun 29, 2015
4
0
Hi guys,im wondering on the AYP engine there is two o2 sensors.The first is for the fuel mixture,but i don't know the second is it only for monitoring the work of the cat or it also is used for the fuel mixture.I am asking because i removed my cat and replaced it with a pipe.And when there is no cat the second o2 sensor is getting equal values with the first lambda sensor and the check engine light is on.Since there is error from it,will it affect mu fuel efficiency and the work of the engine,or it only displays that there is a problem with the cat.Thanks
 

mty12345

Active Member
Jun 17, 2011
3,727
451
bristol
Second sensor usually only tells the efficency of the cat, so that shouldn't be anything to worry about.
 

mty12345

Active Member
Jun 17, 2011
3,727
451
bristol
I'm 99% sure that you can just use a spacer to stop the second sensor throwing an eml. It moves it further from the exhaust stream and fools the engine into thinking the cat is ok.
 
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