EQT E-Tuning Q&A

[Diggs24]

It is sort of funny.

"Hey, Ima use this post cat data."
*user unhooks o2 sensor
"Wha, where did the data go? Ok, that's fine. No CEL. I'm sure there's a rational reason there's no data."

 

[uberpolka]

Working from home today so I took a little break and unplugged the o2 and reflashed the tune.



Went for a very short drive and no issues came up.

 

[uberpolka]

As a quick edit, second drive and got a p0036 CEL so I've emailed you and patrick requesting a quick revision to address the cell.

 

[daconchslop]

As a quick edit, second drive and got a p0036 CEL so I've emailed you and patrick requesting a quick revision to address the cell.

I also got an 02 Sensor related CEL on my second start up after reflashing. Cleared it and drove around for about 20 minutes and hasn’t returned yet. Regardless keep us informed of what EQT determine is needed tune related.


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[uberpolka]

Quick read through the facebook post Ed made back in August, looks like people on older tune revisions will just need quick update to eliminate the CEL. A few others had the same issue. Shouldn't require any extra tuning AFAIK



My last revision was end of April fyi.

 

[2013R]

I wonder if it should be assumed that this "trick" is only for Cobb tunes... as other brand tunes might not have this issue. I know this is an EQT thread, but I don't have an EQT tune. yet.. but either way, I don't like the idea of just unplugging an O2 sensor. Probably the OCD in me..

 

[flipflp]

I wonder if it should be assumed that this "trick" is only for Cobb tunes... as other brand tunes might not have this issue. I know this is an EQT thread, but I don't have an EQT tune. yet.. but either way, I don't like the idea of just unplugging an O2 sensor. Probably the OCD in me..

Not to OT, but I was thinking the same thing. I've never heard this come up with UM, or other tuners really. Any "soot" I get, I just assume is from my downpipe and tune and I deal with it, but I never really see anything out my exhaust. Doesn't mean it isn't happening, I just don't pay attention.

Not saying I know if another tuner does anything about that O2, but I might try unplugging it and see what happens to my gas mileage.

 

[docwyte]

If you live in a state where they check readiness codes to pass emissions unplugging the rear O2 will make you insta fail

 

[Ed @ EQT]

If you have an older tune from me, it will need a quick update to take care of the CEL for the rear O2. E-mail me with the request and include your last revision.

-- Ed

 

[Ed @ EQT]

I wonder if it should be assumed that this "trick" is only for Cobb tunes... as other brand tunes might not have this issue. I know this is an EQT thread, but I don't have an EQT tune. yet.. but either way, I don't like the idea of just unplugging an O2 sensor. Probably the OCD in me..

I can't speak for any other tuning platforms. They may be disabling the cat based fuel trims in software. But for any Cobb tunes, this is absolutely the case until Cobb adds the necessary params.

The rear O2 is only there to determine if the cat is working and to adjust the AFR to heat up the cat if necessary. There's nothing wrong with unplugging it if you're running catless or a high flow cat. Or you can play with spacers and such to get it within expected parameters.

-- Ed

 

[Ed @ EQT]

Not to OT, but I was thinking the same thing. I've never heard this come up with UM, or other tuners really. Any "soot" I get, I just assume is from my downpipe and tune and I deal with it, but I never really see anything out my exhaust. Doesn't mean it isn't happening, I just don't pay attention.

Not saying I know if another tuner does anything about that O2, but I might try unplugging it and see what happens to my gas mileage.

You'd have to log the ECU to see if its doing this. But it happens gradually over a week or two and can shift AFR by up to .5:1... which can make things quite rich. Definitely evident in gas mileage.

-- Ed

 

[Ed @ EQT]

If you live in a state where they check readiness codes to pass emissions unplugging the rear O2 will make you insta fail

This is for off road use only. I would never recommend trying to pass inspection with an unplugged O2 or aftermarket downpipe for that matter. If your rear O2 is not happy and causing this rich condition, your monitors are not set anyway.

-- Ed

 

[flipflp]

You'd have to log the ECU to see if its doing this. But it happens gradually over a week or two and can shift AFR by up to .5:1... which can make things quite rich. Definitely evident in gas mileage.

-- Ed

I assume just unplugging the O2 without disconnecting the battery (closest I can get to reflashing to reset trims) wouldn't do anything right? It's easy enough to unplug in the engine bay.

 

[DrewB]

Ed is this true for your base tune as well? My S2 base tune was from February of this year, would it require an update?

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[S1ack]

I would never recommend trying to pass inspection with an unplugged O2 or aftermarket downpipe for that matter.
-- Ed

Just an FYI:
With 02 sensor in, I passed NC inspection on your tune. With Unitronic Downpipe in place.

Edit: NC does look for readiness.