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Thread: 2013 A5 Cabriolet 2.0T quattro A/C not working

  1. #1
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    2013 A5 Cabriolet 2.0T quattro A/C not working

    Hi, recently purchased a 2013 A5 B8.5 fairly cheap but required some work. I scanned the car with a standard code scanner and it showed no codes just after purchase. Car has been repainted but no obvious body damage/repairs and Car Fax also did not show any accident. It was very cold when I bought car and I cycled HVAC system but I probably didn't realize A/C wasn't actually working. It is now warmer and A/C obviously not working. Bought VCDS, came up with below error codes. I replaced the G395 sensor and still have the same error codes. New sensor was from US seller online, but likely not OEM. I have a non MMI car.

    I have also done a fair amount of work in last month and most of it occurred before I got full VCDS scan on car. I have a lot of car experience to include HVAC install, various electrical work, engine rebuilds, etc. No problems on any work I did but it is possible that the codes didn't exist until after work.

    I ran the diagnostics on the HVAC system and the compressor can cycle manually and does generate normal high/low side pressure results when it does cycle. Compressor will otherwise not trigger from dash control. Not sure where to go from here, the G395 sensor was super easy to swap but don't want to dig into other things if I am not sure whats wrong. Car runs great otherwise.

    The work that I have done to car:
    -replaced battery with OEM> did do the battery reset via VCDS. I had charged old battery several times prior to replacement but on slow rate, no jump or rapid boost.
    -put a Sat Nav Backup cam system in. This required removal of most dash components to include radio/HVAC controls and video screen as well as glovebox and pass airbag. Nav system harness is a plug and play for existing harness and the system itself works fine. There are no other problems with HVAC controls/radio or anything else that I am aware of.
    -put a new RS style front grille on, required removal of front bumper cover. No issues, it uncovers G395 sensor but I did the sensor exchange after bumper done and it is really easy. Bumper cover is likely original, lots of scratches on bottom and I didn't find any evidence of body work or repairs when it was off. I don't believe it has been repainted. I replaced the grille as the old one had peeling paint and a crack.
    -spark plug replace, air filter, cabin air filter
    -bluetooth mic/lights/homelink unit above rear view mirror. Just popped old unit and replaced, all components work fine.
    -had drivers seat reupholstered professionally.
    -replaced entire convertible top storage space liner assembly. Works fine now.


    I found a TSB about 2011 (but not 2013) with these codes and suggested a problem with wiring being pinched or cut from central convenience module to G395 sensor. Not sure if that is even related. Not sure how to test sensor either, it could be I just replaced with another bad sensor as G395 goes bad often from what I read online.

    Any help appreciated, thanks!

    Code:
    Chassis Type: FH-AU48 (8R0)
    Scan: 01 02 03 05 06 08 09 15 16 17 19 26 2E 36 42 44 46 47 52 53
              56 62 72 77
    
    VIN: WAUCFAFH0DN000438   Mileage: 79310km-49280miles
    
    01-Engine -- Status: OK 0000
    02-Auto Trans -- Status: OK 0000
    03-ABS Brakes -- Status: OK 0000
    04-Steering Angle -- Status: OK 0000
    05-Acc/Start Auth. -- Status: OK 0000
    06-Seat Mem. Pass -- Status: OK 0000
    08-Auto HVAC -- Status: Malfunction 0010
    09-Cent. Elect. -- Status: Malfunction 0010
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: OK 0000
    19-CAN Gateway -- Status: OK 0000
    26-Auto Roof -- Status: OK 0000
    2E-Media Player 3 -- Status: OK 0000
    36-Seat Mem. Drvr -- Status: OK 0000
    42-Door Elect, Driver -- Status: OK 0000
    44-Steering Assist -- Status: OK 0000
    46-Central Conv. -- Status: OK 0000
    47-Sound System -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    53-Parking Brake -- Status: OK 0000
    56-Radio -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    77-Telephone -- Status: OK 0000
    -------------------------------------------------------------------------------
    Address 01: Engine (DET-CPMA)       Labels:. 06H-907-115-CDN.clb
       Part No SW: 8K5 907 115 F    HW: 8K2 907 115 L
       Component: 2.0l R4/4V TF H09 0008  
       Revision: ECH09---    
       Coding: 622A0013242600062000
       Shop #: WSC 59277 001 1048576
       ASAM Dataset: EV_ECM20TFS0118K5907115F 001009
       ROD: EV_ECM20TFS0118K5907115F.rod
       VCID: 3537DC5345CBDCFF91E-8060
    
    No fault code found.
    Readiness: 1110 0101
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans (J217)       Labels:| 0BK-927-156.clb
       Part No SW: 8K0 927 158 T    HW: 0BK 927 156 AL
       Component: 0BK 20TFSIUSA H16 1001  
       Revision: --H16---    
       Coding: 000002
       Shop #: WSC 00000 000 00000
       ASAM Dataset: EV_TCMAL551211 002018
       ROD: EV_TCMAL551211_002_AU48.rod
       VCID: 47CBA69B2F275E6FF32-8012
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes (J104)       Labels:. 8K0-907-379-V1.clb
       Part No SW: 8K0 907 379 CK    HW: 8K0 907 379 CK
       Component: ESP8 quattro  H09 0100  
       Revision: --------    Serial number: --------------
       Coding: 2D1D18
       Shop #: WSC 02391 823 56573
       VCID: 045171975E11B577560-8050
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
       Part No SW: 8K0 907 064 FL    HW: 8K0 907 064 FL
       Component: BCM2 2.0      H10 0602  
       Revision: 00002001    
       Coding: 09830000000000000000
       Shop #: WSC 02399 823 56573
       VCID: 7F5BFE7B37F7D6AF0B2-802A
    
       Subsystem 1 - Part No SW: 8T0 959 754 A    HW: 8T0 959 754 A
       Component: FBSAUDIB8 IDG  H60 0072 
       Serial number: 0812000051324017    
    
       Subsystem 2 - Part No SW: 8K0 905 852 E    HW: 8K0 905 852 E
       Component: J764 ELV MLB  H40 0046 
       Serial number: 2312000060609015    
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 06: Seat Mem. Pass (J521)       Labels:. 8T0-959-760.clb
       Part No SW: 8T0 959 760 E    HW: 8T0 959 760 E
       Component: MEM-BFS       H10 0076  
       Revision: AA000000    Serial number: 00000026233564
       Coding: 08037025002400001000
       Shop #: WSC 02391 823 56573
       VCID: 45D7AC9315AB4C7F01E-8010
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels: Redir Fail!
       Part No SW: 8K1 820 043 N    HW: 8K1 820 043 N
       Component: KLIMA 3 ZONEN H04 0123  
       Revision: C1000000    Serial number: 01250320121949
       Coding: 6483208000
       Shop #: WSC 02391 823 56573
       VCID: 3333E24B4B3FC2CFBFA-8066
    
    2 Faults Found:
    00457 - Control Module for Network (J519) 
                013 - Check DTC Memory
                 Freeze Frame:
                        Fault Status: 01101101
                        Fault Priority: 6
                        Fault Frequency: 1
                        Reset counter: 126
                        Mileage: 79317 km
                        Time Indication: 0
                        Date: 2018.03.19
                        Time: 10:23:55
    
    00256 - A/C Pressure/Temperature Sensor (G395) 
                008 - Implausible Signal
                 Freeze Frame:
                        Fault Status: 01101000
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 126
                        Mileage: 79317 km
                        Time Indication: 0
                        Date: 2018.03.19
                        Time: 10:23:55
    
                 Freeze Frame:
                        Temperature: 19.0°C
    
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. (J519)       Labels:. 8K0-907-063.clb
       Part No SW: 8K0 907 063 DF    HW: 8K0 907 063 AF
       Component: BCM1 1.0      H14 0103  
       Revision: 06014001    Serial number: 00000398869202
       Coding: 26000091863CAFC00000480300003D0D0F1C528822090221000008000000030100000040000000
       Shop #: WSC 05151 444 125825
       VCID: 76B51B5F18CD97E7584-8022
    
       Subsystem 1 - Part No SW: 8F1 955 119     HW: 8K1 955 119   Labels: 1KX-955-119.CLB
       Component: WWS 260312  H07 0021 
       Serial number: SWF12030265164      
       Coding: 00FD11
    
       Subsystem 2 - Part No SW: 8U0 955 559 B    HW: 8U0 955 559 B  Labels: 8U0-955-559.CLB
       Component: G397_RLFS  H06 0002 
       Serial number: 20210241            
       Coding: 02005D
    
       Subsystem 3 - Part No SW: 8K0 941 531 AS    HW: 8K0 941 531 AS
       Component: E1 - LDS  H03 0031 
       Serial number: 00000000001503123416
    
       Subsystem 4 - Part No SW: 4G0 907 410 A    HW: 4H0 907 410 A
       Component: USHL4.2  H30 0030 
       Serial number: 0000002274555R1C6Y02
    
       Subsystem 5 - Part No SW: 4H0 907 658     HW: 4H0 907 658 
       Component: AQ_Hum_Sensor  H02 0002 
       Serial number: C5284F16000000000001
    
    1 Fault Found:
    00256 - A/C Pressure/Temperature Sensor (G395) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 126
                        Mileage: 79317 km
                        Time Indication: 0
                        Date: 2018.03.19
                        Time: 10:23:55
    
    
    -------------------------------------------------------------------------------
    Address 15: Airbags (J234)       Labels:| 8F0-959-655.clb
       Part No SW: 8F0 959 655 E    HW: 8F0 959 655 E
       Component: AirbagVW-AU10 H12 0430  
       Serial number: 003KKD8008C+  
       Coding: 303741353731303030304A55304C38463053
       Shop #: WSC 02135 785 00200
       ASAM Dataset: EV_AirbaAU10SMEAU485 001004
       ROD: EV_AirbaAU10SMEAU485.rod
       VCID: 3A2DCF6F6CD533877CC-806E
    
       Seat occupied recognition: 
       Subsystem 1 - Part No SW: 8K0 959 339 A    HW: 8K0 959 339 A
       Component: BF-Gewichtss.  H02 0060 
       Serial number: 5810000R1200007U2Z
    
       Crash sensor for side airbag: driver side: 
       Serial number: 6334MSME6A01105FB
    
       Crash sensor for side airbag: front passenger side: 
       Serial number: 6344MSME6C355910F
    
       Crash sensor for side airbag: rear: driver side: 
       Serial number: 6352QSME3E101C58L
    
       Crash sensor for side airbag: rear: passenger side: 
       Serial number: 6362QSME1A101C5EM
    
       Crash sensor for front airbag: driver side: 
       Serial number: 63732SME7A0E09501
    
       Crash sensor for front airbag: front passenger side: 
       Serial number: 63832SME4F101270U
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel (J527)       Labels:. 8K0-953-568.clb
       Part No SW: 8K0 953 568 L    HW: 8K0 953 568 L
       Component: Lenks.Modul   H03 0004  
       Revision: --------    Serial number: 90372LCL001R1 
       Coding: 000016
       Shop #: WSC 02391 823 56573
       VCID: 43D3B28B1B9F724F2FA-8016
    
       Component: E221 - MFL  H03 0003 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels:. 8T0-920-xxx-17.clb
       Part No SW: 8T0 920 950 S    HW: 8T0 920 950 S
       Component: KOMBIINSTR.   H11 0540  
       Revision: 00200000    Serial number: MVD25L83D     
       Coding: 831719000301D705020000
       Shop #: WSC 02391 823 56573
       VCID: 48C9A5A722B95117FA8-801C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels:. 8T0-907-468.clb
       Part No SW: 8R0 907 468 A    HW: 8R0 907 468 A
       Component: GW-BEM 5CAN   H10 0025  
       Revision: 1V040013    Serial number: 1341V1231980D9
       Coding: 00C303FF00
       Shop #: WSC 02391 823 56573
       VCID: 3D27C4737D7B04BF59E-8068
    
       Subsystem 1 - Part No SW: 8X0 915 181     HW: 8X0 915 181 
       Component: J367-BDM  H07 0141 
       Serial number: 00000000003790565626
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 26: Auto Roof (J256)       Labels:| 8F0-959-255.clb
       Part No SW: 8F0 959 255     HW: 8F0 959 255 
       Component: VSG-AUDI-B8   H12 0190  
       Coding: 030000
       Shop #: WSC 02135 785 00200
       ASAM Dataset: EV_ElectRoofContr 001008
       ROD: EV_ElectRoofContr.rod
       VCID: 71BF28437123B0DF8D6-8024
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 2E: Media Player 3 (R199)       Labels:. 8T0-035-785.clb
       Part No SW: 8T0 035 785 A    HW: 8T0 035 785 
       Component: SG ext.Player H08 0290  
       Revision: 00000000    
       Coding: 020302
       Shop #: WSC 02391 823 56573
       VCID: 392FD0636953389F756-806C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 36: Seat Mem. Drvr (J136)       Labels:. 8T0-959-760.clb
       Part No SW: 8T0 959 760 E    HW: 8T0 959 760 E
       Component: MEM-FS        H10 0076  
       Revision: AA000000    Serial number: 00000026293827
       Coding: 08037125002400001000
       Shop #: WSC 02391 823 56573
       VCID: 45D7AC9315AB4C7F01E-8010
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels:. 8K0-959-793.clb
       Part No SW: 8T0 959 793 G    HW: 8T0 959 793 G
       Component: TSG FA        H09 0302  
       Revision: --------    Serial number: --------------
       Coding: 011C43724008332C03
       Shop #: WSC 02391 823 56573
       VCID: 4DC794B3CDDBB43FC9E-8018
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist (J500)       Labels:| 8K0-909-144.clb
       Part No SW: 8K0 909 144 F    HW: 8K0 909 144 B
       Component: RCEPS         H36 0507  
       Revision: 00001000    Serial number: 0025332093
       Coding: 100000000001
       Shop #: WSC 16994 001 1048576
       ASAM Dataset: EV_RCEPSAU48X 008014
       ROD: EV_RCEPSAU48X_008.rod
       VCID: 3431E1574EB1C5F7A60-8060
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv. (J393)       Labels:. 8K0-907-064-46.clb
       Part No SW: 8K0 907 064 FL    HW: 8K0 907 064 FL
       Component: BCM2 2.0      H10 0602  
       Revision: 00002001    Serial number: 0173782176    
       Coding: 010602BA00FA402080B0033200000000
       Shop #: WSC 02391 823 56573
       VCID: 7F5BFE7B37F7D6AF0B2-802A
    
       Subsystem 1 - Part No SW: 8F0 959 719 B    HW: 8K0 959 719 
       Component: GTO BF  H01 0080 
       Serial number: 00000000000000782025
    
       Subsystem 2 - Part No: 1K0 951 605 C
       Component: LIN BACKUP HO  H05 1501 
    
    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: S2500000    
       Coding: 0203010102
       Shop #: WSC 02391 823 56573
       VCID: 74B121570EB185F7660-8020
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels:. 8K0-959-792.clb
       Part No SW: 8T0 959 792 G    HW: 8T0 959 792 G
       Component: TSG BF        H09 0302  
       Revision: --------    Serial number: --------------
       Coding: 011C43324C08332C03
       Shop #: WSC 02391 823 56573
       VCID: 4CC199B736C1BD37DE0-8018
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 53: Parking Brake (----)       Labels: 8K0-907-801-V2.clb
       Part No SW: 8K0 907 801 J    HW: 8K0 907 801 J
       Component: EPB-4         H01 0001  
       Revision: --------    Serial number: 00000000037113
       ASAM Dataset: EV_ParkiBrake 001022
       ROD: EV_ParkiBrake_AU48.rod
       VCID: 3635DB5F58CDD7E7984-8062
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio (J503)       Labels:. 8Tx-035-1xx-56.clb
       Part No SW: 8R1 035 186 B    HW: 8R1 035 186 B
       Component: Con3 Sirius   H08 0451  
       Revision: 00000009    Serial number: AUZ5Z6L1723513
       Coding: 04020002010305004359070800
       Shop #: WSC 02391 823 56573
       VCID: 3431E1574E31C5F7A60-8060
    
       Subsystem 1 - Part No SW: 8T0 919 603 G    HW: 8T0 919 603 G
       Component: Display  
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left (J388)       Labels:. 8K0-959-795.clb
       Part No SW: 8T0 959 795 F    HW: 8T0 959 795 F
       Component: TSG HL        H08 0302  
       Revision: --------    Serial number: --------------
       Coding: 010C03304008372C03
       Shop #: WSC 02391 823 56573
       VCID: 4EC593BFC0DD8F27B04-801A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right (J389)       Labels:. 8K0-959-794.clb
       Part No SW: 8T0 959 795 F    HW: 8T0 959 795 F
       Component: TSG HR        H08 0302  
       Revision: --------    Serial number: --------------
       Coding: 010C03304008372C03
       Shop #: WSC 02391 823 56573
       VCID: 4EC593BFC0DD8F27B04-801A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 77: Telephone        Labels: 8P0-862-335.lbl
       Part No SW: 8T0 862 336 F    HW: 8T0 862 336 E
       Component: FSE_256x BT     H45 0660  
       Revision: 00000000    Serial number: 00000005262643
       Coding: 0010370
       Shop #: WSC 02335 785 00200
       VCID: 3E25C37F7C7D1FA7404-806A
    
    No fault code found.

  2. #2
    NostraJackAss Jack@European_Parts's Avatar
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    Hello Op and welcome to the VCDS forum.

    Check LIN to AC switch and fuses + verify the switch is correct part number and actual Freon level is correct.

    Correct gateway error.......by verifying twisted pair is ok and blocks report the AC controller to 0x19 and 0x09.

    Verify all shared sensors for tracks with LIN are correct part number and in working order with G395

    JPPSG

    http://forums.ross-tech.com/showthre...uot-JPPSG-quot
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    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
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  3. #3
    Ross-Tech Employee Jef's Avatar
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    The G395 is a simple 3 wire sensor, looks to be located on the left side of the condenser. /1 is ground, /3 is power and /2 is data over a LIN Bus. Unplug the sensor and with an incandescent test light, verify there is good power/ground at /1 + /3.

    Also, I've seen cases where the J530 Garage Door Opener can cause issues with the A/C since it is on the same LIN Bus as the G395 sensor. The J530 is a small black box just behind the Audi badge on the grill, unplug it and see if you can then clear the fault code for the G395.
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  5. #4
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    Jack, Jef,
    Thanks for help.

    so I tried the easy stuff: Checked fuses (fine), disconnected J530 (no luck) and checked the connector for G395 for power. Pin 1 and 3 produce approx 13V when grounded, pin 2 produces approx 0.5V if that makes any difference. Took an ohm meter to both my old and new G395 sensor and I get infinite ohms with any pin pair connection. I assume the switch requires pressure to close and give a different reading. I do have a compressor and can set whatever pressure I want, but not sure how to make the fitting work. Is there any way to easily check G395 sensor? I am suspicious my new sensor could also be a problem. Bought on ebay as 'new other' with claim it was new but not in original box. Looks a little beat up(?) but clean and marks look OEM and part number is: 4H0929126 which should be part unless I made a mistake.

    I did buy a legit shop manual, can dig into the HVAC service and wiring diagrams. I have a standard a/c gauge set and the high/low side pressures seem normal when compressor cycled in VCDS, is there a way to confirm R134 volume other than evacuate and refill correct amount? I don't have any way to recapture but I can vacuum system so was hoping to avoid refilling unless absolutely necessary. Incidentally, this is my first Audi so I am in new territory on some of this.

    I have no problems changing components, but not sure how to "Correct gateway error.......by verifying twisted pair is ok and blocks report the AC controller to 0x19 and 0x09." I am guessing I need to find the specific twisted pair on wiring diagram and then confirm continuity to...?

  6. #5
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    I should also add: when A/C is manually tested through VCDS, it cycles repeatedly. I think this is normal like other cars that don't always run compressor continuously. High side goes up, low side drops when this happens. Stays that way for approx 6-10 sec, then cycles off for same amount of time without me doing anything in VCDS.

  7. #6
    Ross-Tech Employee Jef's Avatar
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    Quote Originally Posted by esrandl View Post
    Bought on ebay


    Lets unplug the G395 sensor and also unplug the J530 Garage Door Opener. Ohm test from /2 of the G395 sensor to /2 of the J530 Garage Door Opener. This should be a yellow/grey wire. If you get pretty much a dead short, then the data wire for the G395 is good. You imply you have power/ground already for the sensor... so if that data wire checks out good, go to the Audi dealer and get a new G395 sensor.
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  9. #7
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    2.1 Ohms.... off to the dealer!

    "" yes, I agree.

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  11. #8
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    Some follow up:

    Got a legit G395 at dealer (>$130..). I didn't want to chance getting a counterfeit or non working sensor. Turns out the prior sensor I got "new other" on Ebay wasn't working so it was the problem (as was the original failed sensor), so getting a real OEM sensor solved the issue. All is good now. Thanks Jef for helping sort out that the connections seemed to work as I didn't want to pop for an expensive sensor if that wasn't the issue.

    Hope this helps some others, it is a super easy fix... but probably worth popping for a legit new OEM sensor.

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