PowertrainP30B4

Caution

Severity: Caution - get it checked when you can

NOx Sensor 1 Signal Message Counter Incorrect

10 brands affected · Description from Holden data.

Key terms: 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 10

Brand	Code	Description	System
Daewoo	P30B4	No description available	Powertrain
GM	P30B4	No description available	Powertrain
Holden	P30B4	NOx Sensor 1 Signal Message Counter Incorrect Brand	Powertrain
Mitsubishi	P30B4	Cell internal resistance Brand	Powertrain
Opel	P30B4	No description available	Powertrain
Peugeot	P30B4	No description available	Powertrain
Proton	P30B4	Cell internal resistance Brand	Powertrain
Saab	P30B4	No description available	Powertrain
Tata	P30B4	No description available	Powertrain
Toyota	P30B4	No description available	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.

5Related codes

Browse Pxxx codes or P30Bxx codes.