hey guys just installing my new kooks headers. i have a question im new to the car industry. Do i buy extenders for both of my 02 sensors??? and do i need the second 02 sensor plugged in if i dont have cats in the headers??

thanksss

 

bump

 

Don't know about Kooks but my Dynatech needed extensions for both front and both rear O2 sensors.

Yes, you need the rear O2 sensors in place BUT you will have to have a Tuner adjust the output signal or you will get a CEL. Even with Rear O2 senors on a high flo cat the signal needs adjusting by a Tuner.

Get the Cats, they'll help on an Inspection.

 

do u know where i can buy just the extensions??

 

Jegs.com has a good price, but you will have to figure out which ones to get

 

yes you need the extenders but my kooks came with them. as for the second set if there is a hole there you will need to put them in there. you won't need to plug them in if you turn them off with the tune but you will have to figure out where you want to tie up the wires at. I just hooked mine up and turned them off that way when it gets inspected they will look and see that it's all there

 

You DO NOT need the rear 02 sensors. Actually is a waste of effort to install them if you are not running cats. Any good tuner can tune out all the codes associated with the rear 02 sensors and you'll never see a CEL.



http://www.amazon.com/Innovate-Motor...4012538&sr=8-1

 

Shouldln't need them with Kooks but if you do http://autowiringsolutions.com/ is an excellent source. I bought two quality 02 extensions from them cheaper then other places I priced.

 

It may help you to understand the purpose of the four different O2 sensors. The front O2 sensors are monitoring air/fuel ratio for each bank and reporting to the ECU which is then adjusting fuel inputs.

The rear O2 sensors are also monitoring air/fuel ratio, but are behind the Cats. Therefore the rear O2 output should be flat (the Cats should burn all the O2 and fuel remnants). Occasionally, the ECU runs a Cat check right after engine start up. It is checking that the Cat output is still 0. The Cats are normally installed right up next to the cast iron exhaust manifolds. This is so they heat up to operating temp immediately and "light off".
When we add long tube headers, we relocate the Cats further down in the X pipe and now they take longer to light off. Thus, even when you use Cats in a long tube header car, you will occasionally get a check engine light because it did not pass the initial Cat start up check.
Tuners will turn off this report by having the ECM ignore the rear O2 sensor inputs.

Having said all this, I think it is still a good idea to use Cats. They work fine 99.99% of the time and the new hi-flow cats really do not hurt power until you reach obscene levels. They also prevent the heavy fuel smells in the cockpit.