PowertrainP2A00

Caution

Severity: Caution - get it checked when you can

The upstream oxygen sensor enters the working voltage too slowly/the upstream oxygen sensor exits the ready state

36 brands affected · Description from Toyota 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 36

Brand	Code	Description	System
Ashok Leyland CV	P2A00	No description available	Powertrain
BAIC Motor	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Mercedes-Benz	P2A00	No description available	Powertrain
BYD	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Chery	P2A00	Oxygen sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Daewoo	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Daihatsu	P2A00	Air/fuel sensor circuit response slow Brand	Powertrain
DFFS	P2A00	Upstream oxygen sensor range/performance failure Brand	Powertrain
DFFX	P2A00	The upstream oxygen sensor is not ready properly Brand	Powertrain
DFXK	P2A00	Upstream oxygen sensor activation impossible Brand	Powertrain
EOBD	P2A00	Oksygensensorkrets område/ytelse bank 1 sensor 1 Brand	Powertrain
Geely	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
GM	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Great Wall	P2A00	Oxygen Sensor Brand	Powertrain
Hafei	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Holden	P2A00	HO2S Performance Sensor 1 Brand	Powertrain
Honda	P2A00	P1172/ update Brand	Powertrain
Hyundai	P2A00	No description available	Powertrain
Isuzu	P2A00	No description available	Powertrain
Land Rover	P2A00	Oxygen circuit range/performance. Bank 1 - sensor 1 Brand	Powertrain
Maserati	P2A00	O2 Sensor 1/1 Circuit Performance Brand	Powertrain
Mitsubishi	P2A00	Oxygen sensor(front) range Brand	Powertrain
Opel	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Perodua	P2A00	Air/fuel sensor circuit response slow Brand	Powertrain
Peugeot	P2A00	No description available	Powertrain
Porsche	P2A00	No description available	Powertrain
Proton	P2A00	Oxygen sensor(front) range Brand	Powertrain
Saab	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
MG (SAIC)	P2A00	O2 Sensor Circuit Range/Performance Brand	Powertrain
Smart	P2A00	No description available	Powertrain
Subaru	P2A00	No description available	Powertrain
Suzuki	P2A00	O2 Sensor Circuit Range / Performance (Bank1 Sensor1) Brand	Powertrain
SWM Motor	P2A00	The upstream oxygen sensor exits the ready state abnormally Brand	Powertrain
Tata	P2A00	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Brand	Powertrain
Toyota	P2A00	The upstream oxygen sensor enters the working voltage too slowly/the upstream oxygen sensor exits the ready state Brand	Powertrain
Volkswagen	P2A00	SAE - O2 sensor (B1 S1) circuit range/Peformance; Cannot be tested at this time 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 1

These 7-character codes are manufacturer-specific variants of P2A00 and may be reported by some scan tools.

Brand	Code	Description	System
Volvo	P2A0000	If this test was not started manually, it was activated via a redirection from 'Component test: Lambda probe' because the DTC is set, i.e. the lambda probe, front, cannot reach a rich lambda value Brand	Powertrain

6Related codes

Browse Pxxx codes or P2A0xx codes.