i have a 96 civic ex and i just put a header, downpipe and cat back exhaust with a cold air intake. i have the factory cat in. i repelaced the 02 sensor in the header and i am still having a check engine light on. i got a my car tested and it said the 02 sensor in the header is bad but i just put a brand new one in. i dont know what i can do. is it because of the air flow that is going through the header and the computer is not reading it? is there a solutuion? if anyone can help me i would appreciate it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicsihatbk &raquo;</TD></TR><TR><TD CLASS="quote">i have a 96 civic ex and i just put a header, downpipe and cat back exhaust with a cold air intake. i have the factory cat in. i repelaced the 02 sensor in the header and i am still having a check engine light on. i got a my car tested and it said the 02 sensor in the header is bad but i just put a brand new one in. i dont know what i can do. is it because of the air flow that is going through the header and the computer is not reading it? is there a solutuion? if anyone can help me i would appreciate it.</TD></TR></TABLE>

there are a couple of questions to ask you here.
1. what type of o2 sensor did you put? is it a universal one or the exact one for your car?

2. after installing the o2 sensor, did you reset the ecu?

 

ya i put in a 02 senor that was for my 96-00. i had the car scanned and they were able to turn it off but when i got on it the light reappeared.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicsihatbk &raquo;</TD></TR><TR><TD CLASS="quote">ya i put in a 02 senor that was for my 96-00. i had the car scanned and they were able to turn it off but when i got on it the light reappeared. </TD></TR></TABLE>
Was it a universal O2 sensor (that you had to wire) or was it factory/factory replica (plug & play).

 

the sensor i just plugged in. i didnt have to wire anything.

 

u have got to check whats the code causes the check engine light
there is a way to check the code of the engine light
https://honda-tech.com/zerothread/1901557

 

Well, ebay sells these MIL eliminator's that wires to O2 sensor but im not to sure if it will work on the front O2 sensor, i got one for 2000 ex...(Airmass headers with 2.25' staright pipe exaust wit a high flow cat and stocky muff....)They are pretty cheap.

 

i did that. the light is still on? i think i might have got a bad sensor than? is there any way that i can by pass that part of the computer?

 

did u put back the intake sensor????

i have had this problem u should put the sensor in and check if it goes off


Modified by 97H22Prelude at 10:35 AM 8/12/2007

 

yes i did that. the sensor in the intake. i put my facotry intake back on to see if that would change the air flow going into my motor. the light is still on.

 

well that is what i did and it went off just trying to help

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97H22Prelude &raquo;</TD></TR><TR><TD CLASS="quote">did u put back the intake sensor????

i have had this problem u should put the sensor in and check if it goes off</TD></TR></TABLE>

Why the **** would the intake air temperature sensor have anything to do with an oxygen sensor code?

 

ya i agree with you. i just am so comfused on why this is happening.

 

also when i am driving the car the cel dimes and than gets brighter. when i down shift or accelerate the light changes brightness. is that sign of something?

 

i really need help on this please. i need to pass e check soon. anyone have this problem?

 

this might be a dumb question but hey ya never know...is the front or rear O2 sensor that is throwing the code cause maybe you changed the wrong one

almost happened to me..had to tell my mechanic (that i absolutely no longer use or will ever go to again) that there is a sensor on the header and on the CAT.

but just check that out to be 100%

 

i had the car checked and the dcv said it was the front 02 sensor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicsihatbk &raquo;</TD></TR><TR><TD CLASS="quote">i had the car checked and the dcv said it was the front 02 sensor. </TD></TR></TABLE>
simply replace the o2 sensor and u are golden

 

i did repplace it and the cel was still on.

 

i put a new one in when i got my exhuast finished. dcv can turn it off but when i get get on it the cel comes back on. computer by pass maybe i need to get?

 

so then you should pay the place that sold you the sensor a visit..if you still have receipt tell them and even have the mechanic sign a failed emissions test or something due to a bad sensor. and ask if they will get you a new one.

 

ya i the only problem is the place i got it from is in florida. so i am going to send it back get a refund. i am going to buy the honda oem one. but can i buy somehting that bypasses the computer or put in a obd1 computer in my car?