Hi all, I've recently purchased a 2011 Superb mk2. As is the case with older VAG cars, it is riddled with electrical faults that I'd love to clear if possible. The car seems smooth and drives fine to me (maybe some jerky lower end gear changes, but that might just be my driving and coming from a car with CVT). Engine light, ABS, tire pressure and traction control lights are all on. I'm no auto electrician, but AI has helped me out a bit.

OBD results are below. As far as I'm aware there is an electrical fault somewhere. This should be responsible for all the engine sensor issues. AI leads me to believe either a failing relay or bad ground, but I'm struggling to identify which relays to test and all the ground points I've found look decent. The ECU itself looks a bit corroded so I'd like to take a look at the connections on it, but I can't work out how to get the plastic protector above it off.

I also know that the ABS modules can be a nuisance. The rear left ABS sensor has been replaced but the code still shows. This leads me to believe it is also a wiring issue or the reluctor ring is damaged. I'm not entirely sure how to test this as I don't have the tools/space to remove the wheel bearing myself.

I'd like to try and at least identify where the electrical issues are coming from before caving in to handing over my wallet to an auto electrician on a wild goose chase.

Other codes I suspect are just false positives triggered by previously mentioned issues.

OBD scan results

Car Scanner ELM OBD2

Version: 1.121.0/401210/GP

DTC report

Connection profile: Skoda OBD-II / EOBDDate: 7/21/2025 6:00:22 PM

VIN: TMBMC93T0B9044243

============================

OBD-IIOBD-II

DTCs: 8

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

P0657 [0x0657]

Actuator supply voltage - open circuit

Status: Pending

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

P0458 [0x0458]

Evaporative emission (EVAP) system, EVAP valve - circuit low

Status: Pending

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

P2090 [0x2090]

Camshaft position (CMP) actuator B, bank 1 - circuit low

Status: Pending

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

P2088 [0x2088]

Camshaft position (CMP) actuator A, bank 1 - circuit low

Status: Pending

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

P0031 [0x0031]

Heated oxygen sensor (HO2S) 1, bank 1, heater control - circuit low

HO2S Heater Circuit Low Voltage Bank 1 Sensor 1

Status: Pending

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

P0051 [0x0051]

Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit low

HO2S Heater Circuit Low Voltage Bank 2 Sensor 1

Status: Pending

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

P0037 [0x0037]

Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit low

HO2S Heater Circuit Low Voltage Bank 1 Sensor 2

Status: Pending

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

P0057 [0x0057]

Heated oxygen sensor (HO2S) 2, bank 2, heater control - heater circuit low

HO2S Heater Circuit Low Voltage Bank 2 Sensor 2

Status: Pending

============================

19. CAN Gateway

No DTC found.

============================

09. Onboard supply control unit

No DTC found.

============================

02. Transmission control unit02. Transmission control unit

DTCs: 1

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

18255 [0x474F]

P1847 Read data from the fault memory of the ABS control unit; Please read out the fault memory of the ABS control unit

Status: Validated and stored in non volatile memory, Validated fault present at time of request

============================

03. ABS control unit03. ABS control unit

DTCs: 1

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

00290 [0x0122]

Rear Left Wheel Speed Sensor-G46; Rear left speed sensor-G46; Throttle valve potentiometer-G69 signal too small

Status: Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

============================

01. Engine control unit01. Engine control unit

DTCs: 8

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

12423 [0x3087]

Supply relay for engine components electrical faults in the circuit

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

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

01092 [0x0444]

Folding Roof Switch (Folded) -F171; Convertible top stowed switch-F171; Tank ventilation valve-N80 interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

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

04183 [0x1057]

Bank1, camshaft adjustment, exhaust interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

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

05416 [0x1528]

Bank1, camshaft adjustment => - N205 interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

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

00048 [0x0030]

Heat Exchanger Temperature Sensor, Left-G306; Left heat exchanger temperature sensor-G306; Bank1-Probe1, heating circuit interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

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

00080 [0x0050]

Request for sunroof function; Functional requirement sunroof; Bank2-Probe1, Heating Circuit Electrical Fault

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

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

00054 [0x0036]

Temperature sensor in the rear right of the center console-G312; Center console temperature sensor, rear right-G312; Bank1-Probe2, heating circuit interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

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

00086 [0x0056]

Battery Parallel Relay-J581; Relay for parallel connection of batteries-J581; Bank2-Probe2, Heating Circuit Electrical Fault

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

============================

08. Heater and climate

No DTC found.

============================

0D. Slide Door Left (VW TP2.0)

No DTC found.

============================

10. Parking Assistant 210. Parking Assistant 2

DTCs: 2

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

01543 [0x0607]

Parking Assistant Warning Buzzer, Rear-H15; Warning buzzer for parking aid-H15; Control module implausible

Status: Pending fault present, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

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

01316 [0x0524]

Brake control unit

Status: Pending fault present, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

============================

15. SRS

No DTC found.

============================

16. Steering column

No DTC found.

============================

17. Dashboard

No DTC found.

============================

22. Four-wheel drive22. Four-wheel drive

DTCs: 1

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

00625 [0x0271]

Speed signal; Injection valve cylinder 4-N33 short circuit to positive

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

============================

25. Immobilizer

No DTC found.

============================

36. Driver seat adjustment

No DTC found.

============================

37. Navigation system

No DTC found.

============================

42. Driver door electronic equipment

No DTC found.

============================

44. Power steering44. Power steering

DTCs: 1

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

01316 [0x0524]

Brake control unit

Status: Pending fault present, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

============================

47. Acoustic system

No DTC found.

============================

52. Front passenger door electronics

No DTC found.

============================

55. Headlights corrector

No DTC found.

============================

56. Head unit (MMI) (VW TP2.0)

No DTC found.

============================

62. Rear left door electoronics (VW TP2.0)

No DTC found.

============================

72. Rear right door electronics (VW TP2.0)

No DTC found.

============================

77. Telephone

No DTC found.

============================

78. Slide Door Right (VW TP2.0)

No DTC found.

I have an Australian (LHD) 2012 Skoda Superb mk2 stationwagon (or estate) 3.6L VR6 4x4 CVDA with a lot of error codes. I dont know where to start with fixing them.

Car Scanner ELM OBD2

Version: 1.121.0/401210/GP

DTC report

Connection profile: Skoda OBD-II / EOBDDate: 7/21/2025 6:00:22 PM

VIN: TMBMC93T0B9044243

============================

OBD-IIOBD-II

DTCs: 8

P0657 [0x0657]

Actuator supply voltage - open circuit

Status: Pending

P0458 [0x0458]

Evaporative emission (EVAP) system, EVAP valve - circuit low

Status: Pending

P2090 [0x2090]

Camshaft position (CMP) actuator B, bank 1 - circuit low

Status: Pending

P2088 [0x2088]

Camshaft position (CMP) actuator A, bank 1 - circuit low

Status: Pending

P0031 [0x0031]

Heated oxygen sensor (HO2S) 1, bank 1, heater control - circuit low

HO2S Heater Circuit Low Voltage Bank 1 Sensor 1

Status: Pending

P0051 [0x0051]

Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit low

HO2S Heater Circuit Low Voltage Bank 2 Sensor 1

Status: Pending

P0037 [0x0037]

Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit low

HO2S Heater Circuit Low Voltage Bank 1 Sensor 2

Status: Pending

P0057 [0x0057]

Heated oxygen sensor (HO2S) 2, bank 2, heater control - heater circuit low

HO2S Heater Circuit Low Voltage Bank 2 Sensor 2

Status: Pending

============================

CAN Gateway

No DTC found.

============================

Onboard supply control unit

No DTC found.

============================

Transmission control unit02. Transmission control unit

DTCs: 1

18255 [0x474F]

P1847 Read data from the fault memory of the ABS control unit; Please read out the fault memory of the ABS control unit

Status: Validated and stored in non volatile memory, Validated fault present at time of request

============================

ABS control unit03. ABS control unit

DTCs: 1

00290 [0x0122]

Rear Left Wheel Speed Sensor-G46; Rear left speed sensor-G46; Throttle valve potentiometer-G69 signal too small

Status: Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

============================

Engine control unit01. Engine control unit

DTCs: 8

12423 [0x3087]

Supply relay for engine components electrical faults in the circuit

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

01092 [0x0444]

Folding Roof Switch (Folded) -F171; Convertible top stowed switch-F171; Tank ventilation valve-N80 interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

04183 [0x1057]

Bank1, camshaft adjustment, exhaust interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

05416 [0x1528]

Bank1, camshaft adjustment => - N205 interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

00048 [0x0030]

Heat Exchanger Temperature Sensor, Left-G306; Left heat exchanger temperature sensor-G306; Bank1-Probe1, heating circuit interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

00080 [0x0050]

Request for sunroof function; Functional requirement sunroof; Bank2-Probe1, Heating Circuit Electrical Fault

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

00054 [0x0036]

Temperature sensor in the rear right of the center console-G312; Center console temperature sensor, rear right-G312; Bank1-Probe2, heating circuit interruption

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

00086 [0x0056]

Battery Parallel Relay-J581; Relay for parallel connection of batteries-J581; Bank2-Probe2, Heating Circuit Electrical Fault

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

============================

Heater and climate

No DTC found.

============================

0D. Slide Door Left (VW TP2.0)

No DTC found.

============================

Parking Assistant 210. Parking Assistant 2

DTCs: 2

01543 [0x0607]

Parking Assistant Warning Buzzer, Rear-H15; Warning buzzer for parking aid-H15; Control module implausible

Status: Pending fault present, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

01316 [0x0524]

Brake control unit

Status: Pending fault present, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

============================

SRS

No DTC found.

============================

Steering column

No DTC found.

============================

Dashboard

No DTC found.

============================

Four-wheel drive22. Four-wheel drive

DTCs: 1

00625 [0x0271]

Speed signal; Injection valve cylinder 4-N33 short circuit to positive

Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

============================

Immobilizer

No DTC found.

============================

Driver seat adjustment

No DTC found.

============================

Navigation system

No DTC found.

============================

Driver door electronic equipment

No DTC found.

============================

Power steering44. Power steering

DTCs: 1

01316 [0x0524]

Brake control unit

Status: Pending fault present, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request

============================

Acoustic system

No DTC found.

============================

Front passenger door electronics

No DTC found.

============================

Headlights corrector

No DTC found.

===================

=========

Head unit (MMI) (VW TP2.0)

No DTC found.

============================

Rear left door electoronics (VW TP2.0)

No DTC found.

============================

Rear right door electronics (VW TP2.0)

No DTC found.

============================

Telephone

No DTC found.

============================

Slide Door Right (VW TP2.0)

No DTC found.

For my rear speed sensor the hub/bearing was also replaced due to corrosion. Maybe something you should investigate. Mine all done by Skoda. Takes away the ABS and traction lights when fixed.

Good morning, welcome to the forum.

I'd first suggest a full test of battery condition, a failing battery can often cause multiple, seemingly random DTCs.