PowertrainP123F

Caution

Severity: Caution - get it checked when you can

Linear oxygen sensor heating circuit low

14 brands affected · Description from BYD data.

Key terms: Oxygen sensor: measures oxygen in the exhaust gas · Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.

2Common causes

Sensor or actuator fault
Wiring or connector fault
Vacuum or intake leak
Fuel or ignition problem
Control module fault

3Can I drive?

Caution · drive with care

Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 14

Brand	Code	Description	System
BYD	P123F	Linear oxygen sensor heating circuit low Brand	Powertrain
Chery	P123F	Faultpath Cylinder5-specific Warnings Brand	Powertrain
Daewoo	P123F	No description available	Powertrain
DFXK	P123F	Firing order, injection end time exceeding the limit for cylinder 6 Brand	Powertrain
EOBD	P123F	NOx anduri side katkendlik Brand	Powertrain
GM	P123F	No description available	Powertrain
Great Wall	P123F	Faultpath cylinder5-specific warnings Brand	Powertrain
Holden	P123F	Cylinder 3 Alternative Fuel Injector High Control Circuit Shorted to Control Circuit Brand	Powertrain
Isuzu	P123F	No description available	Powertrain
Opel	P123F	No description available	Powertrain
Peugeot	P123F	No description available	Powertrain
Saab	P123F	No description available	Powertrain
Subaru	P123F	No description available	Powertrain
SWM Motor	P123F	Linear oxygen sensor heating circuit low Brand	Powertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Extended variant codes 2

These 7-character codes are manufacturer-specific variants of P123F and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P123F00	Gesperrter Schlssel WFS wurde benutzt Brand	Powertrain
Sprinter	P123F00	Gesperrter Schlüssel WFS wurde benutzt Brand	Powertrain

6Related codes

Browse Pxxx codes or P123xx codes.