Fault code lookup

PowertrainP0174

Caution

Severity: Caution - get it checked when you can

System Too Lean (Bank 2)

40 brands affected · Generic SAE J2012 description.

Key terms: Catalytic converter: cleans the exhaust gases · 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

The engine is running lean on the second bank of cylinders. That means there is too much air or not enough fuel in the mixture.

2Common causes

  1. Vacuum or intake air leak
  2. Dirty or faulty mass air flow sensor
  3. Weak fuel pump or clogged fuel filter
  4. Leaking intake manifold gasket
  5. Faulty oxygen sensor
  6. Leaking fuel injector seals

3Can I drive?

Caution · drive with care

Have it checked soon rather than ignoring it: a long-term lean mixture can overheat the engine and damage the catalytic converter.

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 40

BrandCodeDescriptionSystem
Ashok Leyland CVP0174System Too Lean (Bank 2) SAEPowertrain
BAIC MotorP0174System Too Lean Bank 2 BrandPowertrain
Mercedes-BenzP0174System Too Lean (Bank 2) SAEPowertrain
BMWP0174Mixture too lean BrandPowertrain
BYDP0174System too lean BrandPowertrain
CheryP0174System too lean BrandPowertrain
ChryslerP0174Fuel system 2/1 fuel mixture under correction BrandPowertrain
DaewooP0174Fuel System Lean Bank2 BrandPowertrain
DaihatsuP0174Lean abnormal BrandPowertrain
DFFSP0174System Too Lean Bank 2 BrandPowertrain
DFFXP0174System too lean BrandPowertrain
DFXKP0174System Too Lean Bank 2 BrandPowertrain
EOBDP0174System too lean bank 2 BrandPowertrain
FordP0174System Too Lean (Bank 2) SAEPowertrain
GeelyP0174System too lean BrandPowertrain
GMP0174System Too Lean Bank 2 BrandPowertrain
Great WallP0174System too lean BrandPowertrain
HafeiP0174System too lean BrandPowertrain
HoldenP0174Fuel Trim System Lean Bank 2 BrandPowertrain
HondaP0174P0171/ update BrandPowertrain
HyundaiP0174System Too Lean (Bank 2) SAEPowertrain
IsuzuP0174System Too Lean (Bank 2) SAEPowertrain
Land RoverP0174System Too Lean (Bank 2) SAEPowertrain
MahindraP0174System Too Lean (Bank 2) SAEPowertrain
MaseratiP0174System Too Lean (Bank 2) SAEPowertrain
MazdaP0174System Too Lean (Bank 2) SAEPowertrain
MitsubishiP0174Fuel trim 2 too lean BrandPowertrain
NissanP0174Fuel system - lean BrandPowertrain
OpelP0174System Too Lean Bank 2 BrandPowertrain
PeroduaP0174Lean abnormal BrandPowertrain
PeugeotP0174System Too Lean (Bank 2) SAEPowertrain
PorscheP0174System Too Lean (Bank 2) SAEPowertrain
ProtonP0174System Too Lean (Bank 2) SAEPowertrain
SaabP0174System Too Lean Bank 2 BrandPowertrain
MG (SAIC)P0174System Too Lean Bank 2 BrandPowertrain
SubaruP0174System Too Lean BrandPowertrain
SuzukiP0174Fuel system too lean (Bank 2) BrandPowertrain
TataP0174System Too Lean Bank 2 BrandPowertrain
ToyotaP0174The multi-function display remote control information is invalid BrandPowertrain
VolkswagenP0174System Too Lean, Bank 2 BrandPowertrain

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 12

These 7-character codes are manufacturer-specific variants of P0174 and may be reported by some scan tools.

BrandCodeDescriptionSystem
SsangYongP017400Insufficient MDP of injector #4 BrandPowertrain
VolvoP017400If the values are less than 0.85 on bank 2, fault trace according to ECM BrandPowertrain
SsangYongP017401Bank #2 air/fuel ratio control malfunction - fuel rich BrandPowertrain
SsangYongP017402Bank #2 learning control malfunction - rich at idling BrandPowertrain
SsangYongP017403Bank #2 learning control malfunction - rich under low load BrandPowertrain
SsangYongP017404Bank #2 learning control malfunction - rich under high load BrandPowertrain
SsangYongP01740BInsufficient MDP of injector #3(medium rail pressure) BrandPowertrain
SsangYongP01740DInsufficient MDP of injector #2(medium rail pressure) BrandPowertrain
SsangYongP017410Bank #2 short-term learning control of air/fuel ratio: fuel rich BrandPowertrain
SsangYongP017415Insufficient MDP of injector #3(low rail pressure) BrandPowertrain
SsangYongP017417Insufficient MDP of injector #2(low rail pressure) BrandPowertrain
Mercedes-BenzP017484Das Gemisch (Zylinderreihe 2) ist zu mager. Es liegt ein Signal unterhalb des zulässigen Grenzwertes. BrandPowertrain

6Related codes

  • P0170 Fuel Trim (Bank 1)
  • P0171 System Too Lean (Bank 1)
  • P0172 System Too Rich (Bank 1)
  • P0173 Fuel Trim (Bank 2)
  • P0175 System Too Rich (Bank 2)
  • P0176 Fuel Composition Sensor Circuit
  • P0177 Fuel Composition Sensor Circuit Range/Performance
  • P0178 Fuel Composition Sensor Circuit Low Input
  • P0179 Fuel Composition Sensor Circuit High Input
  • P017A Cylinder head temperature sensor 'A' circuit
  • P017B Cylinder head temperature sensor 'A' range/performance
  • P017C All fuel level information is invalid

Browse Pxxx codes or P017xx codes.

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