O2 SensorLow ImpactPetrol

P0056 — HO2S Heater Control Circuit (Bank 2 Sensor 2)

Post-catalyst O2 sensor heater issue on bank 2.

5+

Affected Brands

12+

ECU Platforms

2

Related Services

8

Related DTCs

Symptoms

What the driver typically experiences when P0056 is stored

!Check Engine Light
iBank 2 O2 heater fault

Why does P0056 appear after tuning?

Appears on V-engines after catalyst modifications on both banks.

How proper calibration can address P0056

Dual-bank O2 sensor calibration is standard in WEREMAP exhaust modification files.

Related Tuning Services

Relevant services for the system behind P0056

Catalyst OffDTC Off

Related Diagnostic Codes

Codes from the same diagnostic system as P0056

P0036Low Impact

HO2S Heater Control Circuit (Bank 1 Sensor 2)

P0136Low Impact

O2 Sensor Circuit (Bank 1 Sensor 2)

P0141Low Impact

O2 Sensor Heater Circuit (Bank 1 Sensor 2)

P0161Moderate Impact

Diagnostic Trouble Code P0161

P0420Moderate Impact

Catalyst System Efficiency Below Threshold (Bank 1)

P0430Moderate Impact

Catalyst System Efficiency Below Threshold (Bank 2)

P0138Moderate Impact

Diagnostic Trouble Code P0138

P0158Moderate Impact

Diagnostic Trouble Code P0158

Affected ECU Platforms

Bosch ME9.7Bosch MEVD17.2.GBosch MG1CS201Siemens/Continental SIMOS16.21Bosch A2769001400Bosch MED17.7.1Delco e82Siemens/Continental unknownDelco E78Siemens/Continental MSD80/81Bosch MED9.1Denso SH7058 MB279700

Commonly Affected Vehicles

BMW3erBosch MEVD17.2.G
BMW5 Serie - M5 Sedan�Bosch MG1CS201
AudiQ7Siemens/Continental SIMOS16.21
MBMLBosch A2769001400
ChevroletCamaroDelco e82
PorscheCaymanSiemens/Continental unknown
ChevroletCruzeDelco E78

Based on data from 5+ vehicle brands. P0056 is not limited to these models.

Frequently Asked Questions

What does P0056 mean?â–¼
Post-catalyst O2 sensor heater issue on bank 2.
Why does P0056 appear after ECU tuning?â–¼
Appears on V-engines after catalyst modifications on both banks.
How do you prevent P0056 during remapping?â–¼
Dual-bank O2 sensor calibration is standard in WEREMAP exhaust modification files.
Which vehicles are affected by P0056?â–¼
P0056 is commonly found on BMW, Audi, MB, Chevrolet, Porsche vehicles equipped with Bosch ME9.7, Bosch MEVD17.2.G, Bosch MG1CS201, Siemens/Continental SIMOS16.21 ECU platforms.
What other codes appear alongside P0056?â–¼
P0056 frequently appears together with P0036, P0136, P0141, P0161, P0420. These related codes typically originate from the same system modification and should be addressed together in the calibration.

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