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Old 09-11-2012, 12:38 PM   #1
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AEM UEGO Probelm

Having issues with my wide band.

When I start the car, the gauge goes all the way lean with a ---

I have had the sensor on for about 2000 miles if that. I am not throwing a cell and INPA shows my factory sensors at around 50% mixture at idle.


Should I try to clean the sensor or purchase a new one? What would make it go bad that fast?

Ay ideas? I hate driving without the gauge.
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Old 09-11-2012, 12:45 PM   #2
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New sensor.

Lead fuel or high temps Make the sensor go bad.
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Old 09-11-2012, 08:23 PM   #3
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Most of my customers don't even get 2000 miles out of those AEMs!
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Old 09-11-2012, 08:28 PM   #4
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Most of my customers don't even get 2000 miles out of those AEMs!
Crazy! I personally got over 15000miles on mine before I changed it...and it still works fine I just got over ambitious. I know somewhere between 350-500gal of 110 leaded fuel for that sensor as well.
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Old 09-11-2012, 08:36 PM   #5
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Hah, perfect timing. I was just looking into buying some AEM gauges. What else would you guys recommend?

PS. OP, please check your PM when you have a few
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Old 09-11-2012, 08:47 PM   #6
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hah, perfect timing. I was just looking into buying some aem gauges. What else would you guys recommend?

Ps. Op, please check your pm when you have a few
lc-1
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Old 09-11-2012, 10:59 PM   #7
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Crazy! I personally got over 15000miles on mine before I changed it...and it still works fine I just got over ambitious. I know somewhere between 350-500gal of 110 leaded fuel for that sensor as well.
No way!! I sell 5 or 6 of those sensors per week! Ive had one customer go through 4 this summer!! The guys that only drive their cars on weekends and on leaded fuel go through them all the time! Funny thing is that most people dont even know when they are bad as they still read seemingly ok, just their response time gets very slow.
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Old 09-12-2012, 02:38 AM   #8
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lc-1
I'd say MTX-L if he wants the gauge

Quote:
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No way!! I sell 5 or 6 of those sensors per week! Ive had one customer go through 4 this summer!! The guys that only drive their cars on weekends and on leaded fuel go through them all the time! Funny thing is that most people dont even know when they are bad as they still read seemingly ok, just their response time gets very slow.
Agreed , though the AEM does use bosch sensors right ?
Word around swedish forums is that the AEM heats the sensor too quickly, in a few seconds i've heard while "real" units do do it over 10 times that time.
Any thoughts on that ?
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Old 09-12-2012, 08:28 AM   #9
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No way!! I sell 5 or 6 of those sensors per week! Ive had one customer go through 4 this summer!! The guys that only drive their cars on weekends and on leaded fuel go through them all the time! Funny thing is that most people dont even know when they are bad as they still read seemingly ok, just their response time gets very slow.

Yeah I only drive it on weekends. Does AEM warranty these things?


This is annoying. The replacement sensors go for around $80.


Funny that my oem sensors are fine.
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Old 09-12-2012, 09:07 AM   #10
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Word around swedish forums is that the AEM heats the sensor too quickly, in a few seconds i've heard while "real" units do do it over 10 times that time.
Any thoughts on that ?
Yes, that is 100% the problem.
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Old 09-12-2012, 05:53 PM   #11
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I'd say secondary air pump as part of the start-up sequence. Unless you've deleted it.
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Old 09-12-2012, 10:10 PM   #12
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Thanks!
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Old 09-13-2012, 08:11 AM   #13
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I'd say secondary air pump as part of the start-up sequence. Unless you've deleted it.
That could be true as well as mine goes to 22.2 for about 5-8secs then goes back down to 14.6. That's if I preheat my WB. If I just crank it shows up 14.6 on the gauges after the warm up phase(WB).

Last edited by TrippinBimmer; 09-13-2012 at 08:13 AM.
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Old 09-13-2012, 11:40 AM   #14
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No way!! I sell 5 or 6 of those sensors per week! Ive had one customer go through 4 this summer!! The guys that only drive their cars on weekends and on leaded fuel go through them all the time! Funny thing is that most people dont even know when they are bad as they still read seemingly ok, just their response time gets very slow.
How far are the sensors from the turbo/engine? The hpf setup has it pretty far back. My first sensor lasted 35k miles. Ive been on my second for 32k

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Old 09-13-2012, 11:56 AM   #15
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Couple of questions where is the sensor installed? How is it installed? Is the sensor parrallel or pointing towards the ground? If it is than the installation is incorrect. It must be over 90 degrees to the ground. Most people do not take this into account when welding on the bung. Can you snap a picture of your install?
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Old 09-13-2012, 01:51 PM   #16
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Hah, perfect timing. I was just looking into buying some AEM gauges. What else would you guys recommend?

PS. OP, please check your PM when you have a few
NGK AFX with the NTK sensor
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Old 09-16-2012, 10:07 AM   #17
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Replaced the sensor. Back in business.

I need to have a new bung welded in. The one I have comes out at a 90 degree angle. I am installing an x-pipe so that will be a good opportunity to install one in the center of it.

Thanks everyone.
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Old 09-17-2012, 04:47 PM   #18
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When you have the new bung installed try to go over 90 degrees so that the tip of the sensor is pointing towards the ground. This is a common thing for people to have the bung installed incorrectly and that can cause the sensor to fail prematurely.
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Old 09-20-2012, 11:17 AM   #19
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It's very hit or miss on the AEM gauge. When I had one, I went about 8000 miles before it failed but had another one after that failed after 2000 miles. When it goes lean, replace immediately. There's no other option. Race gas use only makes them die faster. I have a customer who runs exclusively race gas in his Supra and he's in the shop every friggin month for a new replacement. The reason for the frequent failures is because the AEM UEGO does not use an OEM-style warm-up method. They did this to make the UEGO seemingly more user-friendly as a warm-up cycle can be tedious and annoying. The truth is, that warm-up cycle is very important to the life cycle of the O2 sensor.

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Old 09-20-2012, 12:35 PM   #20
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It's very hit or miss on the AEM gauge. When I had one, I went about 8000 miles before it failed but had another one after that failed after 2000 miles. When it goes lean, replace immediately. There's no other option. Race gas use only makes them die faster. I have a customer who runs exclusively race gas in his Supra and he's in the shop every friggin month for a new replacement. The reason for the frequent failures is because the AEM UEGO does not use an OEM-style warm-up method. They did this to make the UEGO seemingly more user-friendly as a warm-up cycle can be tedious and annoying. The truth is, that warm-up cycle is very important to the life cycle of the O2 sensor.

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I am sorry but this is incorrect. All of the AEM Wideband Gauges implement a full Bosch UEGO chipset and UEGO sensor. As well as implement the Bosch warm-up procedure precisely.

What kills most sensors is a overly rich mixture and leaded fuels. Also an improperly installed sensor in terms of distance from the turbo/head or angle of the sensor.
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