PowertrainP1166

Caution

Severity: Caution - get it checked when you can

Bank 1, long term fuel trim, range 2 rich limit exceeded

25 brands affected · Description from Toyota data.

Key terms: Control module: a small computer that runs one part of the car · Bank 1: the side of the engine containing cylinder 1 · 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 25

Brand	Code	Description	System
BAIC Motor	P1166	Oxygen sensor - LAMBDA control reached limitation Brand	Powertrain
BYD	P1166	NO. 359 battery voltage sampling wire loop fault Brand	Powertrain
Chery	P1166	Long Term Fuel Trim Additive Air Bank 1: Range 2: System too Rich Brand	Powertrain
Daewoo	P1166	Heated O2 Sensor 2 Brand	Powertrain
DFFS	P1166	No description available	Powertrain
DFXK	P1166	Long Term Fuel Trim Additive Air Bank 1: Range 2: System too Rich Brand	Powertrain
EOBD	P1166	Fuel system Brand	Powertrain
Geely	P1166	Long Term Fuel Trim Additive Air Bank 1: Range 2: System too Rich Brand	Powertrain
GM	P1166	Heated O2 Sensor 2 Brand	Powertrain
Holden	P1166	Fuel Rail High Pressure Brand	Powertrain
Honda	P1166	No description available	Powertrain
Hyundai	P1166	No description available	Powertrain
Land Rover	P1166	Oxygen sensor fault detected at low fuel level B2 S1 Brand	Powertrain
Mahindra	P1166	No description available	Powertrain
Mitsubishi	P1166	Rail pressure too high Brand	Powertrain
Nissan	P1166	Heated Oxygen Sensor (HO2S) 2 Brand	Powertrain
Opel	P1166	Heated O2 Sensor 2 Brand	Powertrain
Peugeot	P1166	No description available	Powertrain
Porsche	P1166	No description available	Powertrain
Proton	P1166	Rail pressure too high Brand	Powertrain
Renault	P1166	No description available	Powertrain
Saab	P1166	Heated O2 Sensor 2 Brand	Powertrain
Suzuki	P1166	Rail Pres error (Over Press) Brand	Powertrain
Tata	P1166	Gas Pressure Control Fault Brand	Powertrain
Toyota	P1166	Bank 1, long term fuel trim, range 2 rich 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.

5Extended variant codes 13

These 7-character codes are manufacturer-specific variants of P1166 and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	P116601	Status of AC/DC charge plug lock L Brand	Powertrain
Peugeot	P116623	No description available	Powertrain
Peugeot	P116624	No description available	Powertrain
Peugeot	P116625	No description available	Powertrain
Peugeot	P116626	No description available	Powertrain
Peugeot	P116628	No description available	Powertrain
Peugeot	P116629	No description available	Powertrain
Peugeot	P116630	No description available	Powertrain
Peugeot	P116631	No description available	Powertrain
Peugeot	P116632	No description available	Powertrain
Peugeot	P116633	No description available	Powertrain
Peugeot	P116634	No description available	Powertrain
Peugeot	P116636	No description available	Powertrain

6Related codes

Browse Pxxx codes or P116xx codes.