Golf Mk5 Oxygen Sensor Problem (Lambda) pre cat

[ElBongoBoo]

Hi everyone,

Im currently working on a VW Golf Mk5 1.6 petrol 2004.

I've replaced the Lambda O2 sensor before cat and now I get Open Circuit and Short To Ground in my scans.
Does anyone have any tips on what I can do to find the culprit for the issue?

Before replacement, Short To Ground never appeared in my scans, only after i replaced the O2 with a brand new one.
Also to add, the new O2 sensor has the same amount of pins (5 pin" connector and they're all in the same place.

Thanks in advance, scan below is after clearing all codes once, and going for a quick drive around (scan below is 2nd scan after installing the new sensor)

Saturday,22,January,2022,21:00:14:18868
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.9.0.2 (x64)  HEX-V2 CB: 0.4555.4
Data version: 20210903 DS330.0
www.Ross-Tech.com


VIN: WVWZZZ1KZ5P012752   License Plate: DANNY LAMBDA AFTER TRIP
Mileage: 141100km-87675mi   Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 1K (1K0)
Scan: 01 03 08 09 15 16 17 19 25 42 44 46 52 56 62 72

VIN: WVWZZZ1KZ5P012752   Mileage: 141100km-87675miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-033-BGU.lbl
   Part No: 06A 906 033 CA
   Component: SIMOS71 1.6l 2V     5755
   Revision: --H03---    Serial number: VWZ7Z0D0068814
   Coding: 0000071
   Shop #: WSC 00028 028 00001
   VCID: 6099A06FF647384BC71-8034
   VINID: 9E69EAAAA05BA858000421C5082BD95511

2 Faults Found:
17524 - Oxygen (Lambda) Sensor Heating; B1 S1
            P1116 - 009 - Open Circuit
             Freeze Frame:
                    RPM: 608 /min
                    Mass Air / Rev.: 87.2 mg/str
                    Voltage: 2.100 V
                    Voltage: 13.97 V

17525 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2
            P1117 - 007 - Short to Ground
             Freeze Frame:
                    RPM: 1792 /min
                    Mass Air / Rev.: 179.9 mg/str
                    Voltage: 0.520 V
                    Voltage: 14.48 V

Readiness: 1110 1101

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1K0-907-379-MK60-F.lbl
   Part No: 1K0 907 379 K
   Component: ESP FRONT MK60      0103
   Coding: 0019073
   Shop #: WSC 00028 028 00001
   VCID: 3A2D3207305B029BA95-806E

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 1K0-907-044.lbl
   Part No: 1K0 907 044 AC
   Component: ClimatronicPQ35 066 0404
   Shop #: WSC 00000 000 00000
   VCID: 6889B84F1E77400B0F1-803C

2 Faults Found:
01809 - Actuating Motor for Temperature Flap; Left (V158)
            000 - -
00710 - Defroster Flap Positioning Motor (V107)
            000 - - - Intermittent

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 3C0-937-049-23-M.lbl
   Part No SW: 1K0 937 049 S    HW: 1K0 937 049 S*
   Component: Bordnetz-SG 1.0 H30 0704
   Revision: 00030000    Serial number: 00000000836442
   Coding: EC8F8F0600041800001400001400000000
   Shop #: WSC 00000 000 00000
   VCID: 3FDB43132B7927B39EB-806A

   Subsystem 1 - Part No: 1K1 955 119 B  Labels: 1KX-955-119.CLB
   Component: Wischer VW350  012  0401
   Coding: 00065493
   Shop #: WSC 00000

   Subsystem 2 - Part No: 1K0 955 559 M  Labels: 1K0-955-559-AF.CLB
   Component: RegenLichtSens 005  0605
   Coding: 00217125
   Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 1K0-909-605.lbl
   Part No SW: 1K0 909 605 D    HW: 1K0 909 605 D
   Component: 01 AIRBAG VW8   022 0600
   Revision: 05022000    Serial number: 0033JD0EZSD%
   Coding: 0012337
   Shop #: WSC 00028 028 00001
   VCID: 2D07095BF115A5233C7-8078

   Subsystem 1 - Serial number: 6332MSME30104603

   Subsystem 2 - Serial number: 6342MSME7A325B02

   Subsystem 3 - Serial number: 6351HSME06541903

   Subsystem 4 - Serial number: 6361HSME7E590D03

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 1K0-953-549-MY8.lbl
   Part No SW: 1K0 953 549 A    HW: 1K0 953 549 A
   Component: Lenksäulenmodul 012 0030
   Coding: 0000012
   Shop #: WSC 00028 028 00001
   VCID: 3039102FE627C8CB171-8064

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 1K0-920-xxx-17.lbl
   Part No: 1K0 920 861 A
   Component: KOMBIINSTRUMENT VDD 0814
   Coding: 0007103
   Shop #: WSC 00032 218 21235
   VCID: 270BFB73D3E98F73C6B-8072

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 1K0-907-530-V1.clb
   Part No SW: 1K0 907 530 E    HW: 1K0 907 951
   Component: Gateway         H09 0110
   Revision: 09          Serial number: 270010460303E2
   Coding: 3D3F0340070002
   Shop #: WSC 00028 028 00001
   VCID: 290FFD4BC5FDB903D0F-807C

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No: 1K0 920 861 A
   Component: IMMO            VDD 0814
   Shop #: WSC 00032 218 21235
   VCID: 270BFB73D3E98F73C6B-8072

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 1K0-959-701-MIN1.lbl
   Part No: 1K0 959 701 E
   Component: Tuersteuergeraet 09 0147
   Coding: 0000052
   Shop #: WSC 00028 028 00001
   VCID: 3039102FE627C8CB171-8064

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1Kx-909-144-G2V2.clb
   Part No: 1K1 909 144 G
   Component: EPS_ZFLS Kl.1       1401
   Shop #: WSC 00000 000 00000
   VCID: 2F3B1353FB19D7330EB-807A

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 1K0-959-433-MIN.clb
   Part No: 1K0 959 433 BL
   Component: 01 KSG              0301
   Coding: 80C802087F2D8404084F01E010
   Shop #: WSC 00032 218 21235
   VCID: 7BA3F7037FE1FB93F23-802E

   Subsystem 1 - Component:   Sounder n.mounted    

   Subsystem 2 - Component:       NGS n.mounted    

   Subsystem 3 - Component:      IRUE n.mounted    

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels: 1K0-959-702-MIN1.lbl
   Part No: 1K0 959 702 E
   Component: Tuersteuergeraet 09 0147
   Coding: 0000052
   Shop #: WSC 00028 028 00001
   VCID: 313F152BED2DC1C318F-8064

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 1K0-035-1xx-56.clb
   Part No: 1K0 035 186 J
   Component: Radio GR0           0014
   Revision: 0001002S    Serial number: VWZ2Z2D2009287
   Coding: 0020200
   Shop #: WSC 00028 028 00001
   VCID: 2D07095BF115A5233C7-8078

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels: 1K0-959-703-GEN1.lbl
   Part No: 1K0 959 703 C
   Component: Tuersteuergeraet 06 0202
   Coding: 0000016
   Shop #: WSC 00028 028 00001
   VCID: 3039102FE627C8CB171-8064

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 1K0-959-704-GEN1.lbl
   Part No: 1K0 959 704 C
   Component: Tuersteuergeraet 06 0202
   Coding: 0000016
   Shop #: WSC 00028 028 00001
   VCID: 313F152BED2DC1C318F-8064

No fault code found.

End----------(Elapsed Time: 00:59, VBatt start/end: 14.3V/14.3V)-----------

 

[JMR]

you have problems on both your lambdas : b1 s1 ( first sensor ) shows an open circuit ( most likely plug issue, wire issue ) and b1 s2 short to ground ( after cat lambda) , check wires , plug , replace sensor

 

[Uwe]

What was the source of the replacement sensor?

-Uwe-

 

[ElBongoBoo]

you have problems on both your lambdas : b1 s1 ( first sensor ) shows an open circuit ( most likely plug issue, wire issue ) and b1 s2 short to ground ( after cat lambda) , check wires , plug , replace sensor

Regards to the S1, I tested the loom going to the ECU and they all responded to OHM with a multimeter (all 5 wires). So the wires should be good from the plug.
So maybe the lambda sensor plug is weird.

About the S2, this one is real strange, I've scanned this car every month, and now after we've replaced the lambda S1, S2 has now showed itself as Short to ground.
Do you know if S2 also goes straight to the ECU?
Will check this next.

Thanks for the input!

 

[ElBongoBoo]

What was the source of the replacement sensor?

-Uwe-

My buddy who owns the car bought it from a 3rd party site that has all kinds of parts in various "qualities".
Very possible that the sensor is just paperweight.

 

[JMR]

Yeah..and it might also short circuit your second lambda.. Unplug sensor 1 and see if sensor 2 error still there after rescan/ code clear

 

[ElBongoBoo]

This is the Lambda that was purchased: https://www.trodo.com/lambda-sensor-vemo-v10-76-0155

 

[ElBongoBoo]

Not sure if the thread will bump back up again, but we've done some more trial and error, even got a replacement S2 just to check.
We always get Short to Ground to S2, no matter what we do.
S1 remains Open Circuit.

S2:
We've OHM'ed all the pins on S2 to ECU.
S2 is 4 pinned, and we managed to get a connection from pin 2, 3 and 4.
Pin 1 never responded from any of the ECU pins.
Is pin 1 on S2 connected to S1 directly? Do all lambda wires go straight to ECU?

Pin 1 is a red/blue wire, does anyone know what that wire is, where it goes?

 

[EuroX]

Sounds to me like you got chinesium installed for a sensor, file that part into the round filing cabinet a and buy a bosch unit from a reputable source.

 

[HMC]

Pin 1 is a red/blue wire, does anyone know what that wire is, where it goes?

Edit from original wording as I have now checked the WD.
Blue/Red on Pin 1 goes to a joint power source for both O2 heaters from fuse SB45. So "Is pin 1 on S2 connected to S1 directly?", the answer is yes. " Do all lambda wires go straight to ECU?" No!
Test Pin 1 has NBV with engine running, if not check fuse SB45 is ok and being powered from J757 Engine Current Supply Relay. Check resistance between Pin 1 and Pin 2 on both O2 sensors
Regards HMC

 

[ElBongoBoo]

Sounds to me like you got chinesium installed for a sensor, file that part into the round filing cabinet a and buy a bosch unit from a reputable source.

Haha, we'll see what we do with em

 

[ElBongoBoo]

Edit from original wording as I have now checked the WD.
Blue/Red on Pin 1 goes to a joint power source for both O2 heaters from fuse SB45. So "Is pin 1 on S2 connected to S1 directly?", the answer is yes. " Do all lambda wires go straight to ECU?" No!
Test Pin 1 has NBV with engine running, if not check fuse SB45 is ok and being powered from J757 Engine Current Supply Relay. Check resistance between Pin 1 and Pin 2 on both O2 sensors
Regards HMC

Very interesting, that is incredibly helpful.
We'll do some investigation on this, thank you so much for your help.
I'm sure I'll update the thread once we've checked this.

 

[ElBongoBoo]

I just had another look at my buddy's Golf and I bring good news!

if not check fuse SB45 is ok

First thing i did, had a look in the fuse box, SB45 was missing...

However, this reminded me that I tasked my buddy to check all the fuses back in late December/early January ish.
He pulled a fuse out, OHM'ed it, and wait... where does it go again?
That fuse was then placed in the glovebox until we figured out what it was for.

Jump forward to today, huge creds to @HMC for mentioning the specific fuse for the lambda.
Plugged the 15 fuse back into SB45, did a drive around town, scanned and NOTHING. Thank the lord.

Summary time;
S1 was dead and the replacement worked.
S2 was then revived from the dead after S1 was replaced, which then caused more confusion.
The fuse not being where it was supposed to be caused us to sprial into madness cuz buddy done goofed.

Thank you all for the help, it's much appreciated!
Can finally put this headache inducing crap behind!

Side note about the fuse, we did check the owners manual and various lists online, but we never found anything bound to SB45

 

[Uwe]

Side note about the fuse, we did check the owners manual and various lists online, but we never found anything bound to SB45

There is no substitute for a proper, vehicle-specific wiring diagram.

-Uwe-