PowertrainP0166

Caution

Severity: Caution - get it checked when you can

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)

27 brands affected · Generic SAE J2012 description.

Key terms: Oxygen sensor: measures oxygen in the exhaust gas · Mass air flow sensor: measures the air going into the engine · Bank 2: the side of the engine containing cylinder 2 · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

This code is in the fuel, air and oxygen sensor range, which also includes coolant temperature faults.

2Common causes

Dirty or faulty mass air flow sensor
Vacuum or intake air leak
Weak fuel pump or clogged fuel filter
Faulty fuel injector
Faulty oxygen sensor
Wiring or connector fault

3Can I drive?

Caution · drive with care

Have it diagnosed if the engine runs badly or the code keeps returning. Because this range includes coolant temperature sensors, watch the temperature gauge: if it climbs into the red, or the engine overheats or stalls, stop safely and get professional help.

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 27

Brand	Code	Description	System
Ashok Leyland CV	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
BAIC Motor	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
BMW	P0166	O2 Sensor Circuit No Activity Detected B2S3 Brand	Powertrain
BYD	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
Chery	P0166	Oxygen (Lambda) Sensor B2 S3: No Activity Brand	Powertrain
Daewoo	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
DFFS	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
DFFX	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
DFXK	P0166	Oxygen (Lambda) Sensor B2 S3: No Activity Brand	Powertrain
EOBD	P0166	Happianturin piiri ei havaittu toimintaa pankki 2 anturi 3 Brand	Powertrain
Ford	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
Geely	P0166	Oxygen (Lambda) Sensor B2 S3: No Activity Brand	Powertrain
GM	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
Great Wall	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
Hafei	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
Honda	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
Hyundai	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
Isuzu	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
Land Rover	P0166	O2 sensor circuit no activity detected Brand	Powertrain
Mazda	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
Mitsubishi	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
Peugeot	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) SAE	Powertrain
Saab	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
MG (SAIC)	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
Suzuki	P0166	O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) Brand	Powertrain
Tata	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 Brand	Powertrain
Toyota	P0166	O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3 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

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