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Charting O2 Sensor Voltage - Let's Beat the P0420!

Labbatt33

Labbatt33

Ready to race!
Has anyone tried the spacers with the mini cats on them?



I'm CBFA and am struggling with spacer combos and CELs without a Stage II tune.
 
Thumper

Thumper

Autocross Champion
CSJbny said:
Has anyone tried the spacers with the mini cats on them?
Click to expand...

A couple people have, mixed.

I have not messed with this much, although I do have 2 42DD spacers installed I have not set the car to Stock (since I have testpipe files for my Stg 2 but the stock file does not) to test it. I just never got around to it as I had 4 years before needing a test in CA, but just moved to CO and they are going to have to test before I can register here. So going to have to figure something out.

I don't even care about making it go away for 6000 miles, that's what the testpipe file is for, I just need to force readiness with VCDS and have it make it through the test. :D
 
ViRtUaLheretic

ViRtUaLheretic

╭∩╮（︶__︶&#6
If my current combination wouldnt have worked i was going to try a catted spacer, but alas my setup worked. I had a friend with a GT35 MS3 and the catted spacer worked for him.

FWIW I think the catted o2 sensors are ~$60 each
 
Labbatt33

Labbatt33

Ready to race!
So the catted ones didn't fly. I've been playing around with different spacer set ups and I think I've got the CEL beat. It's been off for around 300 miles and there are no pending codes.

CBFA
USP Catted and resonated DP
Vivid Straight O2 Spacer Med. Jet Front
Vivid J Spacer Small Jet Rear
Still running APR Stage 1 Tune
 
marylandgti

marylandgti

Passed Driver's Ed
I'll see about getting some logs on torque as well. Been error free for 2 months with no tune and a APR DW pipe and finally got the this code. Weather just went from warm to cold in the last day with a ton of rain, so not surprised right now. Cleared the code and will see what I get. Trying to hold out till spring for a tune and clutch.....
 
A

arnshrty

New member
why not tackle this issue using resistors or a potentiometer and a 555 timer to trick the ECU. That way it would see a good voltage constantly. I'm new to VW's, but this is how we did it on Honda's and GM's.
 
Last edited:
pgreene1

pgreene1

Ready to race!
pgreene said:
I finally got back under my car this past Friday to change my O2 spacers around and noticed a ton of carbon buildup at the first clamp on my SPM downpipe, as well as around the slip clamp where the downpipe connects to the exhaust. I fixed both of these connections and re-did my spacers so that the first O2 sensor has no spacer, and the second has the Vibrant J-spacer with the medium insert. My CEL went off the next day and hasn't come back since (300 or so miles later).

-Engine: CBFA
-Downpipe manufacturer: SPM
-Catalytic converter: 200 cell, O2 ARE same distance from cat
-o2 sensor 2 (pre cat): None
-o2 sensor 3 (post cat): Vibrant J with medium jet, facing front
-Result: No CEL for 300+ miles
Click to expand...

I wanted to post an update. After 10k+ miles and a little over 12 months, I finally threw another CEL (P0420) this past weekend. I used the Torque app to clear it and it hasn't come back.

I was able to pass emissions back in June without any issue. I'm very happy with the setup posted above.
 
soze

soze

Go Kart Champion
So with GIAC, o2 readiness is ok, but CEL just gets deleted?

Found this on vortex as well.

If you're CBFA (Like me) you'll have all 3 sensors and a far more tricky car.
You'll need 2 spacers, one on #2 and #3.
A proven spacer setup that has worked for multiple people for thousands of miles etc and which I'll be using is:
Black Forest Industries spacer on spot #2 FACING engine.
Vibrant Performance J-Spacer (Part #11619, can buy on eBay)
Which has 3 inserts of different sizes for different exhaust flows.
With this in spot #3, run a spark plug non-fouler FIRST (Can buy these at pepboys, autozone etc for like $4) THEN with the SMALLEST insert in the Vibrant spacer, screwed into the non-fouler FACING the engine.

Has been proven to work for multiple people for well over 5-10k++ miles.
Click to expand...
 
Gberg2119

Gberg2119

Ready to race!
soze said:
Just got my SPM catted downpipe today.
Will be going GIAC stage 2.
CBFA Motor.

I take it I need to at least buy 1 Vibrant/RAI J Spacer?
Click to expand...

Yes. I'm GIAC stage 2 with a catted SPM downpipe. I just have the one J spacer with the medium jet post cat. Make sure the J spacer is facing towards the front of the car and tilted up a little bit. I've had this for over 10k now and no CEL.
 
soze

soze

Go Kart Champion
Installed my SPM DP over the weekend with one vibrant spacer using Gberg2119's configuration. Got my first P0420. I'm still on GIAC stage 1, and haven't gone stage 2 yet though.

Address 01: Engine (CBF) Labels: 06J-907-115-CBF.clb
Part No SW: 1K0 907 115 AD HW: 1K0 907 115 AD
Component: 2.0l R4/4V TFSI 0060
Revision: E3H12--- Serial number: VWX7Z0H13NF8PG
Coding: 040301081C070160
Shop #: WSC 26632 384 16544
VCID: 68D4601C5B8F405E337-803D

1 Fault Found:
001056 - Catalyst System; Bank 1
P0420 - 000 - Efficiency Below Threshold - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 88988 km
Time Indication: 0
Date: 2000.00.00
Time: 21:35:00

Freeze Frame:
RPM: 2488 /min
Load: 24.3 %
Speed: 100.0 km/h
Temperature: 95.0°C
Temperature: 27.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.224 V

Readiness: 0000 0000
 
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