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problems w o2 sensor 91 crx si b16

Discussion in 'HYBRID -> ED-EF / DA' started by goldgreen90ef, Mar 24, 2007.

  1. goldgreen90ef

    goldgreen90ef goldgeen90ef

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    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
     
  2. danse

    danse Junior Member

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    Have another O2 bung welded on or chip the ecu and turn off the second O2 sensor.
     
  3. goldgreen90ef

    goldgreen90ef goldgeen90ef

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    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
     
  4. 801CRX

    801CRX Got Rice?

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    Put an O2 bung on the header.
     
  5. goldgreen90ef

    goldgreen90ef goldgeen90ef

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

    danse Junior Member

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    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.
     
  7. B16RacerN2NR

    B16RacerN2NR Working Hard VIP

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    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"
     
  8. goldgreen90ef

    goldgreen90ef goldgeen90ef

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    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: Mar 25, 2007
  9. B16RacerN2NR

    B16RacerN2NR Working Hard VIP

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    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.
     
  10. goldgreen90ef

    goldgreen90ef goldgeen90ef

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