PowertrainP0406

Caution

Severity: Caution - get it checked when you can

Exhaust Gas Recirculation Sensor A Circuit High

41 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 41

Brand	Code	Description	System
Ashok Leyland CV	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
BAIC Motor	P0406	EGR valve position sensor voltage high Brand	Powertrain
Mercedes-Benz	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
BMW	P0406	Exhaust Gas Recirculation Sensor A Circuit High Brand	Powertrain
BYD	P0406	EGR lift sensor circuit high Brand	Powertrain
Chery	P0406	EGR lift sensor circuit high Brand	Powertrain
Daewoo	P0406	Exhaust Gas Recirculation Sensor A Circuit High Brand	Powertrain
Daihatsu	P0406	EGR lift sensor system Brand	Powertrain
DFFS	P0406	Oil pressure sensor failure Brand	Powertrain
DFFX	P0406	EGR lift sensor circuit high Brand	Powertrain
DFXK	P0406	EGR sensor circuit short to high voltage Brand	Powertrain
EOBD	P0406	EGR senzor 'A' krug visok Brand	Powertrain
Ford	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Geely	P0406	EGR lift sensor circuit high Brand	Powertrain
GM	P0406	Exhaust Gas Recirculation Sensor A Circuit High Brand	Powertrain
Great Wall	P0406	EGR lift sensor circuit high Brand	Powertrain
Hafei	P0406	EGR lift sensor circuit high Brand	Powertrain
Holden	P0406	Exhaust Gas Recirculation (EGR) Position Sensor Circuit High Voltage Brand	Powertrain
Honda	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Hyundai	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Isuzu	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Land Rover	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Mahindra	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Maserati	P0406	Exhaust Gas Recirculation (EGR) Position Sensor Circuit High Brand	Powertrain
Mazda	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Mitsubishi	P0406	EGR position sensor high Brand	Powertrain
Nissan	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Opel	P0406	Exhaust Gas Recirculation Sensor A Circuit High Brand	Powertrain
Perodua	P0406	EGR lift sensor system Brand	Powertrain
Peugeot	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Porsche	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Proton	P0406	EGR position sensor high Brand	Powertrain
Saab	P0406	Exhaust Gas Recirculation Sensor A Circuit High Brand	Powertrain
MG (SAIC)	P0406	EGR Sensor A Circuit High Brand	Powertrain
Subaru	P0406	Exhaust Gas Recirculation Sensor A Circuit High SAE	Powertrain
Suzuki	P0406	Exhaust Gas Recirculation Sensor 'A' Circuit High Brand	Powertrain
SWM Motor	P0406	Exhaust gas recirculation (EGR) position sensor high voltage fault Brand	Powertrain
Tata	P0406	P-EGR Position Feedback-High Brand	Powertrain
Toyota	P0406	Exhaust gas recirculation (EGR) position sensor A short circuit to power supply Brand	Powertrain
Volvo	P0406	Differential Pressure Feedback EGR Circuit High Brand	Powertrain
Volkswagen	P0406	EGR temp sensor (G98): signal too high; Mechanical failure 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 4

These 7-character codes are manufacturer-specific variants of P0406 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P040600	No description available	Powertrain
Hyundai	P040600	is set when feed back EGR valve position out of low limit position for 0.1 second. In this case, check that stuck of EEGR actuator, air leakage of intake line Brand	Powertrain
Sprinter	P040600	No description available	Powertrain
SsangYong	P040600	High pressure Exhaust Gas Recirculation (EGR) valve position signal circuit open or short to battery (+) Brand	Powertrain

6Related codes

Browse Pxxx codes or P040xx codes.