PowertrainP042A

Caution

Severity: Caution - get it checked when you can

Catalyst temperature sensor circuit bank 1 sensor 2

23 brands affected · Description from Toyota data.

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 · Bank 1: the side of the engine containing cylinder 1 · 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 23

Brand	Code	Description	System
Ashok Leyland CV	P042A	No description available	Powertrain
BAIC Motor	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
BYD	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
Chery	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
Daewoo	P042A	Exhaust Gas Temperature Sensor 2 Low Voltage Brand	Powertrain
DFFS	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
DFFX	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
DFXK	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
EOBD	P042A	Sirkuit sensor suhu katalis bank 1 sensor 2 Brand	Powertrain
Geely	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
GM	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
Great Wall	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
Hafei	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
Holden	P042A	No description available	Powertrain
Hyundai	P042A	No description available	Powertrain
Isuzu	P042A	No description available	Powertrain
Land Rover	P042A	Catalyst temperature sensor circuit Brand	Powertrain
Maserati	P042A	Catalyst temperature sensor circuit (bank 1 sensor 2) Brand	Powertrain
Peugeot	P042A	No description available	Powertrain
Saab	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
MG (SAIC)	P042A	Catalyst Temperature Sensor Circuit Bank 1 Sensor 2 Brand	Powertrain
Tata	P042A	No description available	Powertrain
Toyota	P042A	Catalyst temperature sensor circuit bank 1 sensor 2 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 P042xx codes.