what resistor should i get?

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=97769
Printed Date: May 01, 2024 at 8:39 AM

Topic: what resistor should i get?

Posted By: kmn5
Subject: what resistor should i get?
Date Posted: October 08, 2007 at 4:20 PM

Hi all,
I'm looking for a resistor that will take a 12vdc power source and provide a resistence of 14 ohms.

+12vdc --->>> (resister) ----> output reduced by 12 ohms

I tried serveral online calculators with no luck

thanks

Replies:

Posted By: i am an idiot
Date Posted: October 08, 2007 at 10:43 PM

What are you trying to do?

Posted By: kmn5
Date Posted: October 08, 2007 at 10:49 PM

My ecu is throwing a code because the O2 sensor has been replaced with a wideband O2 (which also feeds the ecu the regular narrow band signal it wants)
BUT the ecu also check to make sure the heating element in the O2 sesnor is working. Which is not there anymore so it thinks the Cat is bad, but it's not
anyways the heating element has a resistance of 11-16 Ohm.
So I just need to trick it into thinking the heating element is working

thanks

Posted By: i am an idiot
Date Posted: October 08, 2007 at 11:36 PM

TMC-25-15-ND is the digikey part number. digi-key.com It is a 15 ohm 25 watt resistor. You could get by with a 10 watt, but it is going to run VERY hot. The 25 watt resistor will get warm.

Posted By: jmelton86
Date Posted: October 08, 2007 at 11:43 PM

i am an idiot wrote:

TMC-25-15-ND is the digikey part number. digi-key.com It is a 15 ohm 25 watt resistor. You could get by with a 10 watt, but it is going to run VERY hot. The 25 watt resistor will get warm.

Is this guy freakin' awesome, or what!?

-------------
2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: kmn5
Date Posted: October 08, 2007 at 11:47 PM

i am an idiot wrote:

TMC-25-15-ND is the digikey part number. digi-key.com It is a 15 ohm 25 watt resistor. You could get by with a 10 watt, but it is going to run VERY hot. The 25 watt resistor will get warm.

that's awesome posted_image

Thanks!
before this I was getting anything from (1/2 watt 15 ohm) to a (10 watt 20 ohm) advice (guy who said this, noted it does get very very hot, but iddn;t know what else to get)....
posted_image

Posted By: godd dan it
Date Posted: October 19, 2007 at 11:55 PM

Is the o2 sensor is behind the cat?

Posted By: kmn5
Date Posted: October 20, 2007 at 12:15 AM

godd dan it wrote:

Is the o2 sensor is behind the cat?

one of them is

Posted By: Mad Scientists
Date Posted: October 20, 2007 at 9:07 AM

Why did you change O2 sensor styles?.. If it's an OBDII car (and with mention of upstream and downstream sensors, as well as heaters, it sounds like it is), you might run into other problems. One thing that comes to mind is an error code for O2 sensor not responding quick enough. The heated O2 sensors are used because the manufacturers wanted to get the control system into closed loop quicker, which meant they had to get the O2 sensors on-line quicker, hence the heaters.

Couple thoughts here.. Year, Make, and Model? Depending on the manufacturers threshold, you might be able to use a different resistor. Toyota's threshold on some of their vehicles is 0.25 to 8 amps on the heater circuit.. anything within that spec will keep the SES light off. A 25 ohm 10 watt resistor would work there.

If you find that you've opened a can of worms with replacing the O2 sensor with a non-stock unit, just get one of these

https://www.google.com/search?hl=en&q=O2+sensor+bung

and install another O2 sensor in the exhaust stream.

Jim