EP3 Type R

**DreadAngel** · 01-07-2013 11:47 AM

Originally Posted by RenzokukenJ

baller high school friends

Nah, the dude is baller, his friends are just good friends lol

**RenzokukenJ** · 01-07-2013 11:52 AM

Originally Posted by DreadAngel

Nah, the dude is baller, his friends are just good friends lol

Shiiii

Wtb baller self

**DreadAngel** · 01-07-2013 11:57 AM

Originally Posted by RenzokukenJ

Shiiii

Wtb baller self

$$$ono!

**UNA91** · 02-07-2013 10:01 PM

Just got a CEL for a failing primary o2 sensor. ordered a new one, Denso part no. 234-9005. Just wondering, does a CEL cause the car to run differently?

**Perry** · 02-07-2013 10:23 PM

Originally Posted by UNA91

Just got a CEL for a failing primary o2 sensor. ordered a new one, Denso part no. 234-9005. Just wondering, does a CEL cause the car to run differently?

Car will probably run rich.

**Poeter** · 04-07-2013 09:51 AM

Originally Posted by UNA91

Just got a CEL for a failing primary o2 sensor. ordered a new one, Denso part no. 234-9005. Just wondering, does a CEL cause the car to run differently?

Well, the main purpose of the oxygen sensor is work out the air-to fuel ratio. In effect the ECU uses that ratio to determine the amount fuel trim required to maintain a ratio that provides good power, fuel economy and allow the cat to work properly for clean emissions.

What happens when this no longer work? The ecu is not able to determine accurately what fuel trim is required, so on the safe side the ECU will most likely provide a richer fuel mixture than it normally does and hence poor fuel economy and dirty emissions due to high count of carbon.

When cruising on constant speed or driving on light acceleration, you may feel very subtle judder with your car. That's because the ECU is trying operate in a closed loop state which means it is tapping into the oxygen sensor that has failed.

However, on hard acceleration or WOT (wide open throttle), a failed oxygen sensor is irrelevant because the ECU ignores the sensor by default relies a pre-programmed fuel map to manage the fuel on your car.

In my opinion if you want the best fuel economy, I would to use the original Honda part rather than sourcing a denso one. Reason is because you're not 100% sure if the sensor response characteristics is identical to that of the Honda sensor. Yes the Honda sensor maybe made from the same manufacturer and Denso is good enough get rid of the CEL based on reports from people already using the aftermarket denso sensor. However, based on that you can't accurately conclude it will perform the same as the Honda sensor.

I think the only accurate way to determine if they are same part is to hook the sensors up to an oscilloscope, blast the sensor with metered oxygen gas and compare the voltage curve to each other. Or if a Honda engineer can formally confirm that they
use exact same sensor as the aftermarket denso sensor.

Hope this helps.

**RenzokukenJ** · 04-07-2013 12:25 PM

Would it be possible for a O2 sensor to be broken without the ECU throwing codes?

**UNA91** · 04-07-2013 12:37 PM

Originally Posted by Poeter

Well, the main purpose of the oxygen sensor is work out the air-to fuel ratio. In effect the ECU uses that ratio to determine the amount fuel trim required to maintain a ratio that provides good power, fuel economy and allow the cat to work properly for clean emissions.

What happens when this no longer work? The ecu is not able to determine accurately what fuel trim is required, so on the safe side the ECU will most likely provide a richer fuel mixture than it normally does and hence poor fuel economy and dirty emissions due to high count of carbon.

When cruising on constant speed or driving on light acceleration, you may feel very subtle judder with your car. That's because the ECU is trying operate in a closed loop state which means it is tapping into the oxygen sensor that has failed.

However, on hard acceleration or WOT (wide open throttle), a failed oxygen sensor is irrelevant because the ECU ignores the sensor by default relies a pre-programmed fuel map to manage the fuel on your car.

In my opinion if you want the best fuel economy, I would to use the original Honda part rather than sourcing a denso one. Reason is because you're not 100% sure if the sensor response characteristics is identical to that of the Honda sensor. Yes the Honda sensor maybe made from the same manufacturer and Denso is good enough get rid of the CEL based on reports from people already using the aftermarket denso sensor. However, based on that you can't accurately conclude it will perform the same as the Honda sensor.

I think the only accurate way to determine if they are same part is to hook the sensors up to an oscilloscope, blast the sensor with metered oxygen gas and compare the voltage curve to each other. Or if a Honda engineer can formally confirm that they
use exact same sensor as the aftermarket denso sensor.

Hope this helps.

Thanks, my car did feel like it's going to stall for a sec when I come to a stop or in stop and go traffic but this was before the cel came on, tho I had always thought it had to do with the idle air control sensor. I don't see a difference in fuel economy or performance tho. Installed the new denso sensor and cel is now gone

both oem and denso look very identical, incl the wire colors