Fuel / Air MeteringModerate ImpactPetrol

P0138 — Diagnostic Trouble Code P0138

OBD-II diagnostic code P0138 relates to the fuel / air metering system. This code is logged when the ECU detects a parameter outside its expected operating range.

7+

Affected Brands

12+

ECU Platforms

2

Related Services

8

Related DTCs

Symptoms

What the driver typically experiences when P0138 is stored

!Check Engine Light
iRough running or hesitation
iAltered fuel mixture

Why does P0138 appear after tuning?

This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.

How proper calibration can address P0138

WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.

Related Tuning Services

Relevant services for the system behind P0138

Catalyst OffDTC Off

Related Diagnostic Codes

Codes from the same diagnostic system as P0138

P0420Moderate Impact

Catalyst System Efficiency Below Threshold (Bank 1)

P0037Low Impact

HO2S Heater Control Circuit Low (Bank 1 Sensor 2)

P0038Moderate Impact

Diagnostic Trouble Code P0038

P0036Low Impact

HO2S Heater Control Circuit (Bank 1 Sensor 2)

P0140Moderate Impact

Diagnostic Trouble Code P0140

P0158Moderate Impact

Diagnostic Trouble Code P0158

P0141Low Impact

O2 Sensor Heater Circuit (Bank 1 Sensor 2)

P0136Low Impact

O2 Sensor Circuit (Bank 1 Sensor 2)

Affected ECU Platforms

unknown sim271deSiemens/Continental GPEC2ABosch MG1CS201Siemens/Continental SIMOS18Bosch MEVD17.2.GSiemens/Continental SIM2K-260Hitachi BED431-xxxDelco e84Valeo V46.1Delco E78Delco e82Keihin 37805-RN0-K130

Commonly Affected Vehicles

DodgeChargerSiemens/Continental GPEC2A
BMW5 Serie - SedanBosch MG1CS201
VWGolfSiemens/Continental SIMOS18
BMW3erBosch MEVD17.2.G
KiaStingerSiemens/Continental SIM2K-260
NissanSentraHitachi BED431-xxx
Opelkarl/vivaDelco e84
CitroenC- ElyseeValeo V46.1

Based on data from 7+ vehicle brands. P0138 is not limited to these models.

Frequently Asked Questions

What does P0138 mean?â–¼
OBD-II diagnostic code P0138 relates to the fuel / air metering system. This code is logged when the ECU detects a parameter outside its expected operating range.
Why does P0138 appear after ECU tuning?â–¼
This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.
How do you prevent P0138 during remapping?â–¼
WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.
Which vehicles are affected by P0138?â–¼
P0138 is commonly found on Dodge, BMW, VW, Kia, Nissan, Opel vehicles equipped with unknown sim271de, Siemens/Continental GPEC2A, Bosch MG1CS201, Siemens/Continental SIMOS18 ECU platforms.
What other codes appear alongside P0138?â–¼
P0138 frequently appears together with P0420, P0037, P0038, P0036, P0140. These related codes typically originate from the same system modification and should be addressed together in the calibration.

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