Recently Installed 42DD 02 spacer about a week ago and I've noticed at under cruising speeds keeping the throttle position at a constant the afr's will jump around from 13 then go to 16 ended up getting P013E for rich/lean. Also read on another thread that it could be the way the spacer is angled and could be leaking and double checked to make sure it was secured. Had no problems on my tune without using one before just decided to get on for being able to pass inspection has anyone experienced this or could it possibly be liked to map sensor?
7
Weird Afr's After 02 Spacer
- Thread starter slogti
- Start date
GTI Jake
Autocross Champion
- Location
- Charlotte, NC
You did install the spacer on the downstream o2 sensor right?
Yes.
Diggs24
Autocross Champion
- Location
- de plains! de plains!
- Car(s)
- 2015 GTI
Are you running full e85?
no, most ethanol I've run is e48 but the car is just on a pump gas file right now just to try to pass inspection.
777-300ER
Go Kart Newbie
- Location
- St Joesph Mi
Ed at eqt experienced this and tells people to just disconnect the rear o2 sensor.
bdelaney4000
Ready to race!
- Location
- Chester, NH
That won't help if he's trying to pass emissions and needs the O2 sensor to pass.
Hoon
Autocross Champion
- Location
- Rhode Island
Not surprising, nobody believed me when I said the rear O2 was used for fueling, until of course Ed said the same thing.
777-300ER
Go Kart Newbie
- Location
- St Joesph Mi
Plug it back in for inspection. If you are throwing a delayed response code you are failing monitors anyways.
Sorry for doubting you if I did. These new ecms are so extremely complex. It's very impressive.
bdelaney4000
Ready to race!
- Location
- Chester, NH
FWIW Op, you'll need the O2 sensor plugged in and run drive cycle to show passed on the monitor. If you're throwing codes though you'll need to play around with the spacer a bit. Make sure it's screwed all the way in to the pipe then back it off just enough so it points upstream. That's what I've done with my Vibrant J-spacer (medium insert). Other than having to flash back to stock and run a drive cycle I've passed every time. No lean/rich codes thrown. Hope this helps.
Twist1
Autocross Newbie
- Location
- Breaking Mustang Hearts
Does Eurodyne shut off the rear 02 or is this just a Cobb issue?
Why do you have to flash back to stock if no CEL?
jimlloyd40
Autocross Champion
- Location
- Phoenix
- Car(s)
- 2018 SE DSG
You wouldn't need to as long as it passes all the readiness tests.
bdelaney4000
Ready to race!
- Location
- Chester, NH
Most stage 2 tunes patch the emissions code so you don't get a check engine light. The problem with that is then the sensor doesn't show readiness. Flashing back to stock allows readiness to be reset, but you need either a really good cat or a good spacer setup so you don't throw codes for catalyst efficiency.
Twist1
Autocross Newbie
- Location
- Breaking Mustang Hearts
But does the second o2 affect afr over time with other tuners as well?