O2 sensor issue

[Joshohol]

So before I dropped my car off for dyno tuning I got this same P0036 O2 sensor heater circuit bank 1 sensor 2. Id have a vagcom write up on it if My kids didnt misplace the charger to the laptop I use for it. Going to install it on another one for the time being.

So I replaced it with brand new oem unit. And dropped the car off. While they had it they said my upstream o2 sensor shit out too and replaced it. Fast forward 3 weeks later.

Im trying to get an inspection on this thing and it still has cold start misfires so it obviously wont get a sticker but now Im also getting the same o2 sensor code again. Any ideas guys? Usually when I see that theres a fuse somewhere when its hondas or nissans that causes this fault or its the sensor.
Any way to check with vagcom.

Also I have an raimotorsport o2 sensor spacer in my catted downpipe.

 

[Joshohol]

Heres the vagcam readout

Sunday,27,March,2016,20:18:28:40210
VCDS Version: Release 15.7.4 (x64) Running on Windows 10 x64
www.Ross-Tech.com

Address 01: Engine Labels: 06F-907-115-AXX.clb
Control Module Part Number: 1K0 907 115 H HW: 8P0 907 115 B
Component and/or Version: 2.0l R4/4V TFSI 0030
Software Coding: 0403010A18070160
Work Shop Code: WSC 66565 257 00032
VCID: 2B7BFE718A982266FB-807E
1 Fault Found:

000054 - Oxygen (Lambda) Sensor B1 S2: Heating Circuit
P0036 - 004 - Malfunction / Open Circuit - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100100
Fault Priority: 0
Fault Frequency: 109
Reset counter: 255
Mileage: 141395 km
Time Indication: 0
Date: 2000.00.00
Time: 23:41:29

Freeze Frame:
RPM: 772 /min
Load: 15.7 %
Speed: 0.0 km/h
Temperature: 84.0°C
Temperature: 45.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.351 V


Readiness: 0000 0001

 

[donjuan1jr]

Even tho its an intermittent fault, check fuse sb12, 10a fuse. Thats for the heater.

 

[Joshohol]

in the engine bay?

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[donjuan1jr]

SA is the front panel on the underhood fuse box, sb is the top portion and sc is inside the cabin, and if u had certain passats or touaregs sd would be the rs in cabin fuse box.

 

[Joshohol]

Fuse is good. checked in vag com. I was looking it up and I guess the first 1 means the heater is active. It goes back an forth from 1 to 0 as you can see in the pictures. Sensor 1 is almost always three 1s and sensor 2 is 0100 an 0000. anyone got any idea h9w to check it further in vagcom?

 

[donjuan1jr]

Check for a chafed wire maybe? It's power from that fuse to the sensor and is grounded by the ecm.

 

[Joshohol]

I checked all the wiring. Downstream sensor should be at 0111 and fluctuate slightly. When I go up a few groups I see the percentage the heaters are on. It says sensor 2 is off but it will kick on enough to make that flicker.

Fuse is fine an wire is fine. I guess I can try an get another sensor. Its only two weeks old ?

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[donjuan1jr]

No wiring all the way to ecm...

 

[Joshohol]

Ill pull my intake out tomorrow and take a look where it comes up from underneath.

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[Wijesunde]

How did you solve this? Got the exact same problem..replaced the sensor still the same..got the same results in vagcom