I got a code 41 on my 2001 ITR... Before I run and spend money on a new O2 sensor, what can I check to see what else might be wrong ?? I am running a JUN3 setup with 255psi, P73 JUN ECU and a p&p head. Could my setup have damaged the sensor ?? Finally, what kind of effect can a bad sensor have on my car ??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iperez &raquo;</TD></TR><TR><TD CLASS="quote">I got a code 41 on my 2001 ITR... Before I run and spend money on a new O2 sensor, what can I check to see what else might be wrong ?? I am running a JUN3 setup with 255psi, P73 JUN ECU and a p&p head. Could my setup have damaged the sensor ?? Finally, what kind of effect can a bad sensor have on my car ?? </TD></TR></TABLE>

Stock O2 sensors are like $250 each..U might need front and rear. but what was the code 41? I am lazy to look it up.

 

Code 41: Primary Oxygen Sensor - Heater circuit malfunction

You are not kidding !! These O2 sensors are quite expensive which is why I want to try and make sure my O2 isn't the problem before I spend money.

 

Just make sure when you change one of the sensors, you change them both. It's like changing your oil and filter, do both at the same time. Good luck.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iperez &raquo;</TD></TR><TR><TD CLASS="quote">Code 41: Primary Oxygen Sensor - Heater circuit malfunction

You are not kidding !! These O2 sensors are quite expensive which is why I want to try and make sure my O2 isn't the problem before I spend money.</TD></TR></TABLE>

How's the gas mileage?

 

is the car running like ****?

if you are gonna get a new sensor, might as well go with a wideband.

 

The car is definitely not running up to par but not totally bad .. Tell me about the wideband over the standard sensor .. what's the advantage ??

 

tuning. of course you would need something like hondata or AEM EMS or whatever to tune with.

 

The heater circuit in the O2 sensor is just a resistive element, like on a electric stove. Measure the resistance between the the black/yellow and black/white (this is what the helms says the colour are) wires. It should be 10-40 OHMs. If it's not then replace it. The heater is pretty robust... I don't think your setup had any to do with the failure.

You can also back probe the ECU too if you're too lazy to get under the car.

 

.....for the $ I'd get a wideband.

I believe they can output narrowband as well.....

And replacements are only $46, compared to the expensive stocker.....!

If you want a quick and easy fix, simply swap your primary and 2ndary o2 sensors and reset the ecu. If the code doesn't come back, you know that was the problem, but 2ndary won't affect your mileage like the primary does.....

 

Thanks a lot for the info guys !! I am considering the wideband route which seems like a reasonable proposition as long as the O2 sensor is being replaced.

As far as the 2nd O2 sensor, I am running an OBD2a ECU (JUN P73) which I understand does not read the 2nd sensor. I've never had a 2nd sensor CEL while running this ECU. Can someone confirm this ??

 

I saw this item on ebay ..

http://cgi.ebay.com/ebaymotors...=true

Is this what I should be looking at ?? Will this fix my O2 sensor problem and provide a tuning tool ??

 

thats just the gauge(a/f ratio output) and wideband sensor. you cant tune with that only. you will need something else to do the actual tuning.

side note, many of the EMS systems come with an a/f ratio display in the software when loaded on the laptop, so technically you dont need to have a gauge in your car. my point is if you are going to get an AEM EMS for example, you can tune the car and have a display on your laptop rather than a gauge in the car. could save you a few bucks(since no gauge is needed in the car) and will be more stealthy by not having any gauges all over the place. I ran my EMS with no gauges and loved it. Nobody had a clue that I was running a stand alone(one less theft worry) or even had my car tuned. stock idle with big *** cams, and high compression, and nobody had a clue

 

RTW DC2, you are right on the money .. I don't have any gauges in my car nor do I want any. I have a bunch of mods in my engine and it is all being controlled by a P73 JUN ECU and a VAFC. The VAFC is a recent adquisition and it is still not tuned. What I would like is a wideband sensor that I can use to tune the car and that will also work to replace my faulty OEM O2 sensor. At this point, I would really like something to read this wideband that will not be too expensive; an EMS is out of budget for the time being.. What are my options ??

 

you should be able to find just the wideband sensor without the gauge if you look around(sorry, not sure where). I know the one AEM uses is a Bosch sensor and I think those are one of the most popular wideband sensors used with most stand alone or tuning devices.

 

Last question ..this Bosch sensor will replace my OEM sensor thus eliminating the CEL and fixing my less-than-normal performance, yes ??

Would you happen to have a part number for this sensor ??

Thanks !!

 

I dont know if this will fix the problem, assuming that your current sensor IS the problem. but it will allow you tunability if you decide to go that route later on.

sorry dont have the part number

 

Fair enough !! Thanks for the info .. I will research a bit more but you definitely got me on the right track !!