PowertrainP040B

Caution

Severity: Caution - get it checked when you can

EGR Temperature Sensor A Circuit Range/Performance

29 brands affected · Generic SAE J2012 description.

Key terms: Catalytic converter: cleans the exhaust gases · EGR: exhaust gas recirculation, which cuts harmful gases · EVAP: the system that traps fuel vapour · Oxygen sensor: measures oxygen in the exhaust gas · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

This range covers emissions control (EGR, EVAP, oxygen sensors and the catalytic converter), but some manufacturers also use P04 codes for oil-pressure, brake-fluid and coolant-level warnings.

2Common causes

Clogged or faulty EGR valve
EVAP system leak (hoses, canister, fuel cap)
Faulty oxygen sensor
Ageing catalytic converter
Low oil, brake fluid or coolant (on some models)
Wiring or connector fault

3Can I drive?

Caution · drive with care

Do not assume this code is safe to drive. Check the description: if it names oil pressure, brake fluid, coolant, or a brake fault, stop safely and have it diagnosed before driving. Emissions-only codes (EGR, EVAP, catalyst) should still be checked before an emissions or roadworthiness inspection.

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 29

Brand	Code	Description	System
Ashok Leyland CV	P040B	EGR Temperature Sensor A Circuit Range/Performance SAE	Powertrain
BAIC Motor	P040B	Exhaust Gas Recirculation (EGR) temperature sensor signal clamping Brand	Powertrain
BYD	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
Chery	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
Daewoo	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
DFFS	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
DFFX	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
DFXK	P040B	Exhaust Gas Recirculation (EGR) temperature sensor signal stuck Brand	Powertrain
EOBD	P040B	Julat/prestasi litar sensor suhu 'A' EGR Brand	Powertrain
Geely	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
GM	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
Great Wall	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
Hafei	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
Holden	P040B	Exhaust Gas Recirculation (EGR) Temperature Sensor 1 Performance Brand	Powertrain
Hyundai	P040B	EGR Temperature Sensor A Circuit Range/Performance SAE	Powertrain
Isuzu	P040B	EGR Temperature Sensor A Circuit Range/Performance SAE	Powertrain
Land Rover	P040B	EGR Temperature Sensor 'A' Circuit Range/Performance Brand	Powertrain
Maserati	P040B	Exhaust Gas Recirculation (EGR) Temperature Sensor 1 Circuit Performance Brand	Powertrain
Mitsubishi	P040B	EGR temperature sensor range Brand	Powertrain
Nissan	P040B	EGR Temperature Sensor A Circuit Range/Performance SAE	Powertrain
Opel	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
Peugeot	P040B	EGR Temperature Sensor A Circuit Range/Performance SAE	Powertrain
Proton	P040B	EGR temperature sensor range Brand	Powertrain
Saab	P040B	Exhaust Gas Recirculation Temperature Sensor A Circuit Range/Performance Brand	Powertrain
MG (SAIC)	P040B	Leakage to plus on squib Brand	Powertrain
Subaru	P040B	EGR Temperature Sensor A Circuit Range/Performance SAE	Powertrain
Tata	P040B	EGR Temperature Sensor A Circuit Range/Performance SAE	Powertrain
Toyota	P040B	Exhaust gas recirculation (EGR) temperature sensor A range/performance failure Brand	Powertrain
Volkswagen	P040B	Exhaust gas recirculation temperature sensor A: Implausuble signal; Lower limit exceeded 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.

5Related codes

Browse Pxxx codes or P040xx codes.