header problem
07-12-2007, 10:18 AM
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header problem
just install a 4 2 1 headers on my single 99 ej and now my check engine light came on . i use the code readers to see what the problem it say low volt on o2 censor and too lean and also it said fuel trim malufunction i thing it the air and fuel mixture aint right can somebody help?
07-12-2007, 10:42 AM
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Re: header problem (ekvtec)
well if you disconnect your secondary o2 sensor from the loop it wont give ECM proper readings and mess up the mixture and throw a code ... get yourself a o2 simulator for the secondaru o2 sensor
11-27-2007, 02:27 PM
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Re: header problem (quapouh)
the computer doesnt use the secondary o2 to adjust fuel trim. all it does is make sure the cat is doin it job. just a lil fyi 
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