Gen 3 viper rear o2

[ShartyMcQueef]

2003 dodge viper.

Deleted the cats and left the rear o2s unplugged.

Went to turn off DTCs and the codes the ecu is throwing are p0141 and p0161 for the rear o2 sensors.

When in the VCM editor, under the DTCs, I have disabled everything that is o2 sensor 2 related but both of the above codes are not even listed.
The ones available for disable are p0136, 0137,0138,0157,0158.

How can I disable the p0141&0161 if they are not showing in the VCM?

Do we need to plug in the rear o2s and just zip tie them out of the way?


Thanks guys.

[LilSick]

post the tune

[ShartyMcQueef]

Not a helpful answer ^^


I took the training and downloaded the newest software versions. I was able to upload the new device code for advanced parameter access.

Advanced Parameter Access should allow the deletion of o2 sensors for off-road race applications.

Support ticket just gave some generic reply about ?we don?t support removing emissions etc.?

Problem is the downstream o2 sensor codes on the CEL are p0141 and p0161. Those are not available for modification in the VCM editor. All of the sensor 2 codes in the VCM editor have been set to disable.
But the CEL is on for the above codes and those are not listed in the DTCs on the editor.

What am I missing?

[Quicksand Jesus]

Are there any updates? I have the same issue, and I'm curious. Tune is posted

[LilSick]

p0141 and 0161 are not listed in any of my jtec controller dtc lists

i would email support

[Quicksand Jesus]

Thank you.

Right, they are unable to help as I have already emailed them. My application is for a track car. I'm not concerned about the light; I'm more concerned that this could affect the fueling and timing strategies, as it does with almost every modern car. It was nice to try this with HP Tuners and the OEM ECM. Is anyone aware of other ways to edit and datalog the JTEC PCM?

[LilSick]

I do not see how this would be effecting timing or fueling

The rear sensors are there to monitor the condition of your catalytic converter

The front sensor tells the ECM if you are richer or leaner than what is programmed

I have tuned JTEC where the rear sensors had been removed, plugs had been been installed in the bungs, and the sensor still plugged in and zip tied to the frame

If the sensors had anything to do with fueling it would have been pig rich

It was not : )

[Quicksand Jesus]

Thank you again.

Ok, you are saying that the JTEC+ doesn't use rear sensor control to keep the system in check (trim for the catalyst), like FAOSC? I did extensive testing on the dyno, and it wasn't obvious. However, the logging is primitive. I did notice a difference in the ignition; it runs more advanced when the code is enabled. I found that interesting, again, there isn't a way to see the PIDs to log. Ahhhh, the joys of "tuning" OE STUFF!

While we are on the topic, does anyone know the definitions of "Type Codes" in the DTC section?

[Quicksand Jesus]

UPDATE

I have identified a working method to reconfigure the rear O2 Sensors on this system. It requires using SCT instead of HP Tuners; they have more scalars, tables, and parameters. The rear O2 Sensors are used for catalyst monitoring, fuel trimming, and diagnosing DTCs in the OEM application.

For the record, I am a fan of HP Tuners and want to share with the community an update and a solution that works. Sometimes, you have to use the right tool. Reverse engineering these systems is a complicated and complex process. I appreciate all the work our partners in the industry do to help us provide great products to our customers.

[PurpleRam]

UPDATE

I have identified a working method to reconfigure the rear O2 Sensors on this system. It requires using SCT instead of HP Tuners; they have more scalars, tables, and parameters. The rear O2 Sensors are used for catalyst monitoring, fuel trimming, and diagnosing DTCs in the OEM application.

For the record, I am a fan of HP Tuners and want to share with the community an update and a solution that works. Sometimes, you have to use the right tool. Reverse engineering these systems is a complicated and complex process. I appreciate all the work our partners in the industry do to help us provide great products to our customers.

Thank you for the Update.

[V10sport]

I had the same issue on my Viper. I just left the rear 02?s plugged in and zip tied out of the way. Light hasn?t came on since.

[Quicksand Jesus]

Hahaha, I guess that works too! Not sure how the fuel trimming would work though.....