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Old 11-12-2019, 10:29 PM   #21
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Dan, this is exactly how I run my car. I lengthened my sensor wires in my harness with twisted pair wire (didnít mess with the actual sensor wires) and have never had a CEL for it. Passed emissions three times now.
Hey! Alright then: that's the easy button!
Good man! Thank you!

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Old 01-11-2020, 07:13 PM   #22
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Dan, this is exactly how I run my car. I lengthened my sensor wires in my harness with twisted pair wire (didnít mess with the actual sensor wires) and have never had a CEL for it. Passed emissions three times now.
I think I'm going to build "extension cables". I have a spare harness.
Any reason not to? I assume I can solder these.... there's not a problem with added resistance, right?

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Old 01-11-2020, 11:16 PM   #23
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Dan, this is exactly how I run my car. I lengthened my sensor wires in my harness with twisted pair wire (didnít mess with the actual sensor wires) and have never had a CEL for it. Passed emissions three times now.
This is what I am doing as well as encuraged by good esults from forum.
What size wire you used on this exension?
I do have all the connectors now and plan to do the extensions probably next weekend.
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Old 01-12-2020, 08:35 AM   #24
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Sort of late on this post, I have been running this same configuration in PA for 7 year No cells and inspection issues. Extended the wires on the second position cat's. I just cut the cable out of the original ones then soldered and shrink wrapped the splices. Then covered the wire in heat loom.
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Old 01-12-2020, 06:12 PM   #25
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Catless wonder?

Soldering is fine and heat shrink. Make sure to slide the heat shrink on the wire before soldering both ends.
I used some harness heat tube I bought from DEI for the extensions.

I used twisted pair wire on the signal wires as the harness is also using twisted wire.

Signal wires are those marked I/J on the schematic.

Wire gauges are listed as 0.5mm or 1.0mm. You can use the closest larger aproxŪmate AWG size.

Schematic

1vK means 1 vor Katalysator or before Catalyzer.
1nK means 1 nach Katalysator after Catalyzer.

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Old 01-13-2020, 12:28 PM   #26
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Fantastic, thank you P_Carfahrer
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Old 01-13-2020, 12:43 PM   #27
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so, do anyone you subscribe to the 'reference o2' stuff regarding continuity of the wire jacket?
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Old 01-13-2020, 03:16 PM   #28
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so, do anyone you subscribe to the 'reference o2' stuff regarding continuity of the wire jacket?
I don't. I think that's a lot of voodoo, personally.

I know over the years and different models of cars I've sure had plenty of scabbed-together o2 sensors, with torn jacket, or NO jacket, and they seemed to be just fine.

I think we see things like this pop-up from people my age who perpetuate mystery surrounding things they don't understand. My generation was much happier with carburetors and cherry-bombs.
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Old 01-13-2020, 03:40 PM   #29
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totally agree; the thread seemed to be going too smooth, however, so thought i'd throw some sand in the vaseline.

how about those who say that the post-cat o2 sensors are used to fine-tune fuel trims?
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Old 01-14-2020, 04:06 AM   #30
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totally agree; the thread seemed to be going too smooth, however, so thought i'd throw some sand in the vaseline.

how about those who say that the post-cat o2 sensors are used to fine-tune fuel trims?
In the UK you can program these out to no I'll effect.
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Old 01-14-2020, 06:47 AM   #31
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In the UK you can program these out to no I'll effect.
and some folks say their cars run rougher w a row tune.
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Old 01-14-2020, 08:41 AM   #32
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totally agree; the thread seemed to be going too smooth, however, so thought i'd throw some sand in the vaseline.



how about those who say that the post-cat o2 sensors are used to fine-tune fuel trims?
I have a tune that doesn't monitor them, and I've noticed it runs very rich that way. But there could be other parameters in the tune causing that condition.


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Old 01-14-2020, 11:47 AM   #33
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and some folks say their cars run rougher w a row tune.
I guess it's all relative. I never hear of any UK or Europe cars complain of rough running due to the standard mapping. I've had 2 Boxsters in standard tune, modded and remapped and never experienced any running problems.
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Old 01-14-2020, 12:52 PM   #34
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me neither, but playing devil's advocate. i think it was brad roberts who made the statement. some ecus do use feedback from the second set of o2 sensors to refine the data from the first set, and i think the bosch units in our cars have that ability. whether they do or not is questionable. and if they did, realise that deleting the second set wouldn't result in big changes in afr, but rather slight changes, perhaps more erratic short-term trims, etc. here's a link:

https://mechanics.stackexchange.com/questions/37442/is-the-after-catalyst-oxygen-sensor-used-for-engine-mixture-control

and here is info regarding how the o2 sensor accesses reference air via the wire sheath:

http://www.autotap.com/techlibrary/understanding_oxygen_sensors.asp

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