the proper way to test a oxygen sensor

   #1  

Shafo

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Hi guys
This may be a dumb question but hopefully somebody can make this clear for me..
Besides getting an obvious lambda fault code as in open cicuit on heater/sensor...how to i test an oxygen sensor?
Lets say for example i log the values and they are off due to the lambda itself giving off incorrect readings...how would i know?
Sorry if this is posted in the wrong section..and sorry if my question is dumb :)
 
   #2  

Jack@European_Parts

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Your question is not dumb.......

Please post a valid auto-scan in code tags, and ref the OXS you want to test.

The scan will give us a background about how to answer you.

The repair manual has manual resistance tests you can do with a meter, and VCDS can conduct tests of the sensors in specific basic setting tests.

The first thing to always consider, is that do you have the correct part # installed, and in the correct location?
 
   #3  

Shafo

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Thanx ! Ok so this question was more of a general question and not 1 car in particular ...but heres an example..i had an audi in a few days ago where i had a fault code p0171...engine lean ...so i replaced the pcv as i could not find any other obvious vacuum leaks ..no fuel pressure faults etc...a day later customer is back ...same fault code...i contact a audi tech bud of mine and he says "replace the upstream o2 sensor" but i dont want to be a "tryer" i want to get the fault first time (dont we all :) ) so jack when u say the resistances can be checked...would they be checked at certain temps? My idea is that a lambdas resistance will change with temperature?
Scan of the car
 
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   #4  

Shafo

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Code:
VCDS Version: Release 15.7.3 (x64) Running on Windows 7 x64
Data version: 20151216
www.Ross-Tech.com

Tuesday,09,February,2016,08:34:33:48700

Chassis Type: 8K (8T0)
Scan: 01 03 05 08 09 15 16 17 19 42 46 47 52 53 55 56 62 72

VIN: WAUZZZ8K5CA054347   Mileage: 143470km-89148miles

01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: Malfunction 0010
08-Auto HVAC -- Status: OK 0000
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: Malfunction 0010
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Sporadic communication error 1000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
 
-------------------------------------------------------------------------------
Address 01: Engine (DET---CDHB)       Labels: 06H-907-115-CAB.clb
   Part No SW: 8K1 907 115 M    HW: 8K1 907 115 
   Component: 1.8l R4/4V TF H18 0004  
   Revision: A5H18---    
   Coding: 0104000C18070120
   Shop #: WSC 06324 000 00000
   ASAM Dataset: EV_ECM18TFS8K1907115M A01004
   ROD: EV_ECM18TFS_AU48.rod
   VCID: 3879906783EDB7FE89-806C

1 Fault Found:
2809 - Fuel Trim; Bank 1 
          P0171 00 [236] - System Too Lean
          MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 5
                    Mileage: 143258 km
                    Date: 2016.02.04
                    Time: 16:29:44

Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels: 8K0-907-379-V1.clb
   Part No SW: 8K0 907 379 BF    HW: 8K0 907 379 BF
   Component: ESP8 front    H04 0030  
   Revision: --------    Serial number: --------------
   Coding: 030500
   Shop #: WSC 06324 000 00000
   VCID: 7EF5467FE94949CE03-802A

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels: 8K0-907-064-05.clb
   Part No SW: 8K0 907 064 CC    HW: 8K0 907 064 CC
   Component: BCM2 2.0      H05 0435  
   Revision: 00002001    
   Coding: 031100
   Shop #: WSC 06325 000 00000
   VCID: 73E3674BD20B14A67C-8026

   Subsystem 1 - Part No SW: 8T0 959 754 D    HW: 8T0 959 754 D
   Component: FBSAUDIB8 IDG  H60 0072 

   Subsystem 2 - Part No SW: 8K0 905 852 D    HW: 8K0 905 852 D
   Component: J764 ELV MLB  H37 0042 

1 Fault Found:
00955 - Key 1 
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 3
                    Fault Frequency: 20
                    Reset counter: 213
                    Mileage: 141285 km
                    Time Indication: 0
                    Date: 2015.12.29
                    Time: 08:38:24


-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: Redir Fail!
   Part No SW: 8T2 820 043 AD    HW: 8T2 820 043 AD
   Component: KLIMA 1 ZONE  H08 0180  
   Revision: B0000000    Serial number: 01230820111591
   Coding: 64040000
   Shop #: WSC 06325 000 00000
   VCID: 74E16457D705139E65-8020

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels: 8K0-907-063.clb
   Part No SW: 8K0 907 063 N    HW: 8K0 907 063 N
   Component: BCM1 1.0      H30 0392  
   Revision: 09030001    Serial number: 00000001024976
   Coding: 2600D0914034AF010001000000001D0D0F1D030802010101000000
   Shop #: WSC 06325 000 00000
   VCID: 3A7D8A6FB5E1A5EE7F-806E

   Subsystem 1 - Part No SW: 8K2 955 119 A    HW: 8T2 955 119   Labels: 1KX-955-119.CLB
   Component: WWS 260811  H06 0070 
   Coding: 00FD11

   Subsystem 2 - Part No SW: 8K0 955 559     HW: 8K0 955 559   Labels: 8K0-955-559.CLB
   Component: RLS  H04 0003 
   Coding: 025028

   Subsystem 3 - Part No SW: 8K0 941 531 AS    HW: 8K0 941 531 AS
   Component: E1 - LDS  H03 0031 

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels: 8K0-959-655.clb
   Part No SW: 8K0 959 655 L    HW: 8K0 959 655 L
   Component: AirbagVW-AU10 H44 0610  
   Serial number: 003JMD0FSP40  
   Coding: 30533435363030303030554A3052384B3053
   Shop #: WSC 06325 000 00000
   ASAM Dataset: EV_AirbaECUVWAUDI010 003010
   ROD: EV_AirbaECUVWAUDI010_AU48.rod
   VCID: 4685EE9FF919D10E0B-8012

   Crash sensor for side airbag; driver side: 
   Serial number: 6334MSME641147635

   Crash sensor for side airbag; front passenger side: 
   Serial number: 6344MSME632550094

   Crash sensor for side airbag; rear; driver side: 
   Serial number: 6352QSME175E206CO

   Crash sensor for side airbag; rear; passenger side: 
   Serial number: 6362QSME315C20405

   Crash sensor for front airbag; driver side: 
   Serial number: 63732SME3B5C52543

   Crash sensor for front airbag; front passenger side: 
   Serial number: 63832SME604F1D7EH

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels: 8K0-953-568.clb
   Part No SW: 8K0 953 568 F    HW: 8K0 953 568 F
   Component: Lenks.Modul   H17 0014  
   Revision: --------    Serial number: 90372KHQ0019F 
   Coding: 000016
   Shop #: WSC 06325 000 00000
   VCID: 3D778173A4CF92D65A-8068

   Component: E221 - MFL  H02 0010 

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels: 8T0-920-xxx-17.clb
   Part No SW: 8K0 920 900 M    HW: 8K0 920 900 M
   Component: KOMBIINSTR.   H20 0258  
   Revision: 00300000    Serial number: EII20XT8C     
   Coding: 2F04080002000008010000
   Shop #: WSC 06325 000 00000
   VCID: 3461A4579785539EA5-8060

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels: 8T0-907-468.clb
   Part No SW: 8T0 907 468 AB    HW: 8T0 907 468 H
   Component: GW-BEM 5CAN   H06 0117  
   Revision: GB800053    Serial number: 5300G11813837F
   Coding: 00C303
   Shop #: WSC 06325 000 00000
   VCID: 010F3D8398B736367E-8054

   Subsystem 1 - Part No SW: 8K0 915 181 E    HW: 8K0 915 181 E
   Component: J367-BDM  H07 0170 

2 Faults Found:
03041 - Energy Management Active 
            000 -  -  - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 7
                    Fault Frequency: 11
                    Reset counter: 220
                    Mileage: 141472 km
                    Time Indication: 0
                    Date: 2016.01.02
                    Time: 09:34:07

             Freeze Frame:
                    Bin. Bits:    10000
                    Voltage: 12.10 V
                    Count: 12

01304 - Radio 
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 246
                    Mileage: 143376 km
                    Time Indication: 0
                    Date: 2016.02.07
                    Time: 10:36:17

             Freeze Frame:
                    Bin. Bits:    10000
                    Voltage: 12.30 V
                    Count: 8
                    Bin. Bits:    10000


-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels: 8K0-959-793.clb
   Part No SW: 8T0 959 793 M    HW: 8T0 959 793 D
   Component: TSG FA        H08 1501  
   Revision: --------    Serial number: --------------
   Coding: 011C02204001410001
   Shop #: WSC 06325 000 00000
   VCID: 53A3C7CB324B74A69C-8006

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels: 8K0-907-064-46.clb
   Part No SW: 8K0 907 064 CC    HW: 8K0 907 064 CC
   Component: BCM2 2.0      H05 0435  
   Revision: 00002001    Serial number: 0157322684    
   Coding: 011A062200B900448130013280000000
   Shop #: WSC 06325 000 00000
   VCID: 73E3674BD20B14A67C-8026

   Subsystem 1 - Part No: 8K0 951 177 
   Component: DWA-Sensor  H02 0040 

   Subsystem 2 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H05 1501 

   Subsystem 3 - Part No SW: 8K0 959 591 B    HW: 8K0 959 591 
   Component: J245 PS050  H08 0043 

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System (J525)       Labels: 8T0-035-223-ASC.clb
   Part No SW: 8T0 035 223 AH    HW: 8T0 035 223 
   Component: DSP STD       H07 0230  
   Revision: S2200000    
   Coding: 0203010101
   Shop #: WSC 06325 000 00000
   VCID: 74E16457D705139E65-8020

1 Fault Found:
01304 - Radio 
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 246
                    Mileage: 143376 km
                    Time Indication: 0
                    Date: 2016.02.07
                    Time: 10:43:42

             Freeze Frame:
                    Voltage: 12.50 V
                    Temperature: 46.0°C
                    Bin. Bits: 00000001


-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels: 8K0-959-792.clb
   Part No SW: 8T0 959 792 M    HW: 8T0 959 792 D
   Component: TSG BF        H08 1501  
   Revision: --------    Serial number: --------------
   Coding: 011C02204001410001
   Shop #: WSC 06325 000 00000
   VCID: 52ADC2CF0D517DAE97-8006

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (J540)       Labels: 8K0-907-801-V1.clb
   Part No SW: 8K0 907 801 H    HW: 8K0 907 801 H
   Component: EPB Audi B8   H09 0100  
   Revision: 00000003    Serial number: 20000000087934
   Shop #: WSC 00000 000 00000
   VCID: 3461A4579785539EA5-8060

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 8K0-907-357.clb
   Part No: 8K5 907 357 B
   Component: Dynamische LWR  H01 0010  
   Revision: 00000001    Serial number:               
   Coding: 0000004
   Shop #: WSC 06325 000 00000
   VCID: 397F956370E7AEF676-806C

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J503)       Labels: 8Tx-035-1xx-56.clb
   Part No SW: 8T2 035 186 P    HW: 8T2 035 186 P
   Component: Concert3      H06 0350  
   Revision: 00000011    Serial number: AUZ5Z6K1638736
   Coding: 0502008001010D000159070000
   Shop #: WSC 06325 000 00000
   VCID: 4587E993CC1FDA1602-8010

   Subsystem 1 - Part No SW: 8T0 919 603 F    HW: 8T0 919 603 F
   Component: Display  

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels: 8K0-959-795.clb
   Part No SW: 8T0 959 795 N    HW: 8T0 959 795 B
   Component: TSG HL        H06 1501  
   Revision: --------    Serial number: --------------
   Coding: 010C02204001210001
   Shop #: WSC 06325 000 00000
   VCID: 56A53EDF21B9618E7B-8002

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels: 8K0-959-794.clb
   Part No SW: 8T0 959 795 N    HW: 8T0 959 795 B
   Component: TSG HR        H06 1501  
   Revision: --------    Serial number: --------------
   Coding: 010C02204001210001
   Shop #: WSC 06325 000 00000
   VCID: 56A53EDF21B9618E7B-8002

No fault code found.

End-------------------------(Elapsed Time: 02:39)--------------------------
 
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   #5  

Jack@European_Parts

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Thank you for posting the auto-scan in code tags.

The repair manual defines the exact tests for using a meter.
www.erwin.audi.com

I think this ecu is MED17.5 UDS
In VCDS you can go into basic settings, and use the pull down menu to do tests selected.

This fault says it's the forward OXS and sporadic lean.

1 Fault Found:
2809 - Fuel Trim; Bank 1
P0171 00 [236] - System Too Lean
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 5
Mileage: 143258 km
Date: 2016.02.04
Time: 16:29:44

I would check for a sporadic vacuum leak and watch fuel PSI/volume/filter/regulation/lift pump/HPP/ MAP\MAF .....I wouldn't be in a rush to change the OXS.

http://wiki.ross-tech.com/wiki/index.php/16555/P0171/000369

16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean [h=4]Possible Causes[/h]
  • Mass Air Flow Sensor (G70) defective
  • Intake System Leak(s)
[h=4]Possible Solutions[/h]
  • Check Mass Air Flow Sensor (G70)
  • Check Fuel Pressure Regulation
  • Check Fuel Pump
  • Check Injectors
  • Check Intake System for Leaks
  • Check Exhaust System for Leaks
  • Check Secondary Air System for Leaks
  • Check Vacuum Pipes for Leaks
[h=4]Special Notes[/h]

http://forums.ross-tech.com/showthread.php?396-Fuel-Trim-Thread&highlight=fuel+trim+thread
 
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