Hi folks,

I'm running cat-less and rear o2-less. I've successfully used the ECU patches to get rid of of the P0031 and P0138 CEL's, but I can't find out how to get rid of P0139 (Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)). Searching on the forums provided no new information, as other people who had/have this CEL seem to be using an electric/mechanical fix to clear their CEL as opposed to the ECU patches.

Hoping someone can help me out with this.

Thanks!

 

I found this around but not sure if it will work for your rom or not. Do it at your own risk!

You need to add that to your rom definition under the "rommetadata" folder. Goo luck!

Just need to change the "01" t "00"

 

That's for an Evo X

 

Bump - Anyone else have any ideas/solutions?

 

Why not run the o2 simulator from tephra v7 rom?

 

I'm already running the standalone patches from MrFred to get rid of the other CEL's, is there another patch in Tephra that would get rid of this one?

 

I can't beat this one either! I'm using my wideband as my input for the ECU and it doesn't like the speed. This is a hassle for inspections.

 

I'm using this and perhaps the address is wrong? It doesn't help me. I'm using Tephra V3 52680322

 

After some more searching there's a DTC disable thread and I read it more carefully and it seems everyone concluded the following:
On a 2008, disable these:
DTC P0139
DTC P0140
And set the Rear O2 bit to 0 in the ECU Options Set #2 bit.1.

Now my issue was that I had a faulty definition for the P0139 disable as

<table name="DTC P0139 0x1 -> 0x0 Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)" address="503b2" scaling="DTC P0139 0x1 -> 0x0 Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)"/>

when it should have been:

<table name="DTC P0139 Disable 0x1 -> 0x0" category="Misc" address="503b2" type="1D" scaling="Hex8"/>

Hope this helps someone else with a 2008. When I switched definitions I saw that this value was still set to "01" so I was able to change it to "0x0" to disable. I suppose the incorrect definition's scaling was the issue. The box would say "enabled" even though I suppose in the background it never changed it from 01 to 00.