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goldgreen90ef · 03-24-2007, 09:43 AM

my 91 crx si with a b16 has a cel for 02 sensor(it has the jdm xsi ecu) come on once in while. i looked under the car at the sensor, and they have 2 wires twisted togather going into the o2(im assuming for the 2 sensors the ecu is looking for? )how do i get around this ? drill the header for another o2 ? thanks

danse · 03-24-2007, 02:27 PM

Have another O2 bung welded on or chip the ecu and turn off the second O2 sensor.

goldgreen90ef · 03-24-2007, 03:49 PM

cool were should the 2nd o2 bung go? is it after the cat, in the cat, or right after the cat? thanks

801CRX · 03-24-2007, 03:58 PM

Put an O2 bung on the header.

goldgreen90ef · 03-24-2007, 04:01 PM

thanks for the response but where? where are the stock locations for a jdm b16 w 2 o2 sensors?

danse · 03-24-2007, 09:16 PM

The stock location for both O2 sensors is on the back side of the exhaust pipe one for each two pipes. Put the O2 sensor as close to the output, ahead of the cat on the header collector.

B16RacerN2NR · 03-24-2007, 09:35 PM

you need to have 1 o2 sensor for each cylinder pair. You can put another o2 sensor at the collector and the car will seem likes it's running normal but it's actually not... here's why... Tech - Closed Loop scroll down to where it says "Pre obd-1 engines"

goldgreen90ef · 03-25-2007, 08:12 AM

thanks for the info guys!!! in your opinion, should i look at having the ecu chipped, or add a 2nd 02 sensor? thanks again

also b16Racern2NR, a quick quest., so the former owner putting both the sensors input into one sensor is probely robbing some power? thanks again, and nice link

B16RacerN2NR · 03-26-2007, 05:50 PM

Quote:

Originally Posted by goldgreen90ef

also b16Racern2NR, a quick quest., so the former owner putting both the sensors input into one sensor is probely robbing some power? thanks again, and nice link

yeah it definately is. It might not be noticeable, but it is. The best thing to do is buy the HaSport header but if you decide to chip your ecu, make sure the chip runs the stock map with just the 2nd o2 not being looked for unless you can get your car on a dyno and get a chip tuned specifically for your motor.

goldgreen90ef · 03-27-2007, 06:34 PM

thanks, good info, cause i allready started to look for a jdm header w the 2 bungs ... thanks again

03-24-2007, 09:43 AM	#1
goldgreen90ef goldgeen90ef Join Date: Aug 2006 Location: cold ohio Posts: 639 iTrader: 0 / 0% Ride: 96 civic cx ,95 celica battle daily grinder, chuck taylors Rep Power: 17	problems w o2 sensor 91 crx si b16 my 91 crx si with a b16 has a cel for 02 sensor(it has the jdm xsi ecu) come on once in while. i looked under the car at the sensor, and they have 2 wires twisted togather going into the o2(im assuming for the 2 sensors the ecu is looking for? )how do i get around this ? drill the header for another o2 ? thanks

03-24-2007, 03:49 PM	#3
goldgreen90ef goldgeen90ef Join Date: Aug 2006 Location: cold ohio Posts: 639 iTrader: 0 / 0% Ride: 96 civic cx ,95 celica battle daily grinder, chuck taylors Rep Power: 17	where shoule the o2 bung go cool were should the 2nd o2 bung go? is it after the cat, in the cat, or right after the cat? thanks

03-25-2007, 08:12 AM	#8
goldgreen90ef goldgeen90ef Join Date: Aug 2006 Location: cold ohio Posts: 639 iTrader: 0 / 0% Ride: 96 civic cx ,95 celica battle daily grinder, chuck taylors Rep Power: 17	thanks for the info guys!!! in your opinion, should i look at having the ecu chipped, or add a 2nd 02 sensor? thanks again also b16Racern2NR, a quick quest., so the former owner putting both the sensors input into one sensor is probely robbing some power? thanks again, and nice link Last edited by goldgreen90ef; 03-25-2007 at 08:17 AM.

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03-24-2007, 02:27 PM	#2
danse Junior Member Join Date: Nov 2005 Posts: 98 iTrader: 0 / 0% Rep Power: 10	Have another O2 bung welded on or chip the ecu and turn off the second O2 sensor.

03-24-2007, 03:58 PM	#4
801CRX Got Rice? Join Date: Dec 2006 Location: UTAH Age: 22 Posts: 1,342 iTrader: 0 / 0% Ride: 89' CRX HF and 90' Civic Si Rep Power: 27	Put an O2 bung on the header.

03-24-2007, 04:01 PM	#5
goldgreen90ef goldgeen90ef Join Date: Aug 2006 Location: cold ohio Posts: 639 iTrader: 0 / 0% Ride: 96 civic cx ,95 celica battle daily grinder, chuck taylors Rep Power: 17	thanks for the response but where? where are the stock locations for a jdm b16 w 2 o2 sensors?

03-24-2007, 09:16 PM	#6
danse Junior Member Join Date: Nov 2005 Posts: 98 iTrader: 0 / 0% Rep Power: 10	The stock location for both O2 sensors is on the back side of the exhaust pipe one for each two pipes. Put the O2 sensor as close to the output, ahead of the cat on the header collector.

03-24-2007, 09:35 PM	#7
B16RacerN2NR I'll be back... Join Date: Feb 2003 Location: Rancho Cucamonga - UTI Age: 26 Posts: 5,320 iTrader: 3 / 100% Ride: 96 DB8, 06 Mazda 5 Rep Power: 174	you need to have 1 o2 sensor for each cylinder pair. You can put another o2 sensor at the collector and the car will seem likes it's running normal but it's actually not... here's why... Tech - Closed Loop scroll down to where it says "Pre obd-1 engines"

03-27-2007, 06:34 PM	#10
goldgreen90ef goldgeen90ef Join Date: Aug 2006 Location: cold ohio Posts: 639 iTrader: 0 / 0% Ride: 96 civic cx ,95 celica battle daily grinder, chuck taylors Rep Power: 17	thanks, good info, cause i allready started to look for a jdm header w the 2 bungs ... thanks again

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problems w o2 sensor 91 crx si b16