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Old 02-23-2018, 08:43 PM   #1
TurboQueef
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Join Date: May 2005
Location: Otsego, MI
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2005 STI
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Default Innovate MTX-L Plus eating sensors

Good day, I installed a MTX-L Plus in late July.... in my winter vehicle... car was in storage until late October.. I have 5K miles on it sense installing the MTX and have gone through two sensors.

The MTX-L is installed in my 04 Forester XT (4EAT), I am running 14.7 AFR in normal cruise and 12/1 WOT with Meth/water 50/50. The sensors read fine for couple thousand miles and then it acts up... It goes into CAL mode when engine is running then offers E8 error code.

Anyone else having issues with this model ?

BTW.. I have one of the first wideband units (LM1) in my STi and it never has issues like this.. The sensors last several years unless I run leaded fuel through them...

Tnx.

Jeff
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Old 02-24-2018, 09:12 AM   #2
point78
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Mines been fine for couple years.

50/50 meth summer, 75/25 winter. 25psi pump91
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Old 02-26-2018, 11:10 AM   #3
86Dreams
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'21 Giulia Q4

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Yes. I have an MTX-L. And am now going to have to get my 3rd sensor. I have read about other people having issues with them as well.

I had a bosch 4.2 that originally came with it die. It started reading erratically around stoich but was OK when lean or rich. I dont think it ever 'died' though.

I upgraded to a 4.9 and it died recently. It started with a little bit of fluctuation then reading a little lean all the time before reading E8. now its totally borked and reads E2 all the time.

The 4.9 started dying after I cleaned some salt out of my engine bay. I have a suspicion that moisture or soap might have gotten in it, however I never sprayed the sensor itself.

If I had to do it all over Id get an AEM, because on top of it all wtf is the harness hard wired to the gauge???
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Old 02-26-2018, 12:18 PM   #4
TurboQueef
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Hummm, not good. I am trying to work with innovate to understand the problem. I have an old LM1 on my STi and have had no issues. Considering you tried different model sensors, I am suspecting something in the gage is off
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Old 02-26-2018, 06:22 PM   #5
Airboy
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2015 WRX

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LSU 4.2 or 4.9 sensor? Mounting location/orientation?

Innovate updated the firmware in the controller for 4.9 sensor a while back.

Interesting read: http://www.nzefi.com/bosch-lsu-wide-...-applications/
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Old 02-27-2018, 02:07 AM   #6
subaru_gc8
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silver

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Quote:
Originally Posted by TurboQueef View Post
Good day, I installed a MTX-L Plus in late July.... in my winter vehicle... car was in storage until late October.. I have 5K miles on it sense installing the MTX and have gone through two sensors.

The MTX-L is installed in my 04 Forester XT (4EAT), I am running 14.7 AFR in normal cruise and 12/1 WOT with Meth/water 50/50. The sensors read fine for couple thousand miles and then it acts up... It goes into CAL mode when engine is running then offers E8 error code.

Anyone else having issues with this model ?

BTW.. I have one of the first wideband units (LM1) in my STi and it never has issues like this.. The sensors last several years unless I run leaded fuel through them...

Tnx.

Jeff
Ive heard of the innovate 1 gen stuff needing lots of calibration, but yeah I have a lc2 on my toyota and had to go through the calibration process like a few times to get it right

although on my subaru I have a plx and that thing has run without problems for the last 3 years
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Old 02-27-2018, 06:13 AM   #7
TurboQueef
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Default

Quote:
Originally Posted by Airboy View Post
LSU 4.2 or 4.9 sensor? Mounting location/orientation?

Innovate updated the firmware in the controller for 4.9 sensor a while back.

Interesting read: http://www.nzefi.com/bosch-lsu-wide-...-applications/
Good info, thanks...

4.9 sensor located in the top of the downpipe maybe 6 inches back from the turbo exhaust housing.

Through discussion with Innovate the thought is perhaps the sensor is too close to the Turbo and it is taking too much heat. This is in conflict with the interesting read you linked up (unless the exhaust temp is over 1796F that is).

I am considering moving the sensor down the pipe a foot or so and using the heat sink I got with my LM1 (which has never failed a sensor unless I ran leaded fuel).

Another point Innovate made is if the power wire used from the switched 12V power source is not capable of handling 2 amps (this is the sensor heater demand) then the sensor can fail over time. Mine is using 12G wire so this is not the case for me.
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Old 02-28-2018, 03:56 AM   #8
bobjr94
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15 WRX, 04 wrb STi
85 wrb BRAT

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I have read that before, the O2 sensor should be at least 18 inches from the turbo outlet, even though all the downpipes have the sensor fitting right in the bellmouth, and that is where mine is at. They do sell O2 sensor spacers/coolers designed to keep a wbo2 sensor from burning out but they are around $60.
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Old 08-04-2018, 12:04 AM   #9
2slofouru
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My BOV goes
COVFEFE!

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I run my sensor at the end of the downpipe, still hot enough and any sound/oscillation from the turbine blades will be a little weaker with the sensor further back. Many dyno tuners clip their sensor into the end of the tailpipe and it works perfectly fine. I don't see being further back causing an issue, especially if your exhaust has no leaks.
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Old 08-04-2018, 07:58 AM   #10
TurboQueef
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2005 STI
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Default

Quote:
Originally Posted by 2slofouru View Post
I run my sensor at the end of the downpipe, still hot enough and any sound/oscillation from the turbine blades will be a little weaker with the sensor further back. Many dyno tuners clip their sensor into the end of the tailpipe and it works perfectly fine. I don't see being further back causing an issue, especially if your exhaust has no leaks.
I had sensor mounted in the rear O2 bung, fried there too... Innovate sent me a new gauge, sensor and heat sink a couple weeks ago.. They suggested I mount it back at top of downpipe using the heat sink.. so far so good.
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