Fault code lookup

PowertrainP0172

Caution

Severity: Caution - get it checked when you can

System Too Rich (Bank 1)

43 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 1: the side of the engine containing cylinder 1 · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine is running rich on one bank of cylinders, meaning there is too much fuel or not enough air in the mixture.

2Common causes

  1. Leaking fuel injector
  2. Faulty fuel pressure regulator
  3. Dirty mass air flow sensor
  4. Blocked air filter
  5. Faulty coolant temperature sensor
  6. Faulty oxygen sensor

3Can I drive?

Caution · drive with care

Usually safe to drive gently. Rich running wastes fuel and can damage the catalytic converter over time; have it checked soon.

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 43

BrandCodeDescriptionSystem
Ashok Leyland CVP0172System Too Rich (Bank 1) SAEPowertrain
BAIC MotorP0172System Too Rich Bank 1 BrandPowertrain
Mercedes-BenzP0172System Too Rich (Bank 1) SAEPowertrain
BMWP0172mixture too rich BrandPowertrain
BYDP0172Fuel system too rich BrandPowertrain
CheryP0172Fuel system too rich BrandPowertrain
ChryslerP0172Fuel system 1/1 lean control below limit BrandPowertrain
DaewooP0172ECU EEPROM Error BrandPowertrain
DaihatsuP0172Rich abnormal BrandPowertrain
DFFSP0172Fuel too rich BrandPowertrain
DFFXP0172Fuel too rich BrandPowertrain
DFXKP0172Fuel system too rich BrandPowertrain
EOBDP0172System zu fett Bank 1 BrandPowertrain
FordP0172MIL On Dtc BrandPowertrain
GeelyP0172B1 Fuel Trim Too Rich BrandPowertrain
GMP0172System Too Rich Bank 1 BrandPowertrain
Great WallP0172System too rich BrandPowertrain
HafeiP0172System too rich BrandPowertrain
HoldenP0172Fuel Trim System Rich BrandPowertrain
HondaP0172System Too Rich (Bank 1) SAEPowertrain
HyundaiP0172System Too Rich (Bank 1) SAEPowertrain
IsuzuP0172System Too Rich (Bank 1) SAEPowertrain
Land RoverP0172System Too Rich (Bank 1) SAEPowertrain
MahindraP0172System Too Rich (Bank 1) SAEPowertrain
MaseratiP0172System too rich (bank 1) BrandPowertrain
MazdaP0172MIL On Dtc BrandPowertrain
MitsubishiP0172Fuel trim too rich BrandPowertrain
NissanP0172Fuel system - rich BrandPowertrain
OpelP0172System Too Rich Bank 1 BrandPowertrain
PeroduaP0172Rich abnormal BrandPowertrain
PeugeotP0172System Too Rich (Bank 1) SAEPowertrain
PorscheP0172System Too Rich (Bank 1) SAEPowertrain
ProtonP0172Fuel trim too rich BrandPowertrain
SaabP0172System Too Rich Bank 1 BrandPowertrain
MG (SAIC)P0172System Too Rich BrandPowertrain
SmartP0172System Too Rich (Bank 1) SAEPowertrain
SprinterP0172System Too Rich (Bank 1) SAEPowertrain
SubaruP0172System Too Rich BrandPowertrain
SuzukiP0172Fuel system too rich (Bank 1) BrandPowertrain
SWM MotorP0172Mixing ratio is too thick BrandPowertrain
TataP0172Lambda Too Rich BrandPowertrain
ToyotaP0172Fuel system is too rich when not idling BrandPowertrain
VolkswagenP0172System Too Rich, Bank 1 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 13

These 7-character codes are manufacturer-specific variants of P0172 and may be reported by some scan tools.

BrandCodeDescriptionSystem
PorscheP017200No description available Powertrain
SsangYongP017200System too rich closed loop air/fuel ratio control at limit - system too rich BrandPowertrain
VolvoP017200If the values are greater than 1.15 on bank 1, fault trace according to ECM BrandPowertrain
SsangYongP017201Bank #1 air/fuel ratio control malfunction - fuel lean BrandPowertrain
SsangYongP017202Bank #1 learning control malfunction - lean at idling BrandPowertrain
SsangYongP017203Bank #1 learning control malfunction - lean under low load BrandPowertrain
SsangYongP017204Bank #1 learning control malfunction - lean under high load BrandPowertrain
SsangYongP017209Bank #1 short-term learning control of air/fuel ratio: fuel lean BrandPowertrain
SsangYongP01720AInsufficient MDP of injector #1(medium rail pressure) BrandPowertrain
SsangYongP01720CInsufficient MDP of injector #4(medium rail pressure) BrandPowertrain
SsangYongP017214Insufficient MDP of injector #1(low rail pressure) BrandPowertrain
SsangYongP017216Insufficient MDP of injector #4(low rail pressure) BrandPowertrain
Mercedes-BenzP017285Das Gemisch (Zylinderreihe 1) ist zu fett. Es liegt ein Signal oberhalb des zulässigen Grenzwertes. BrandPowertrain

6Related codes

  • P0170 Fuel Trim (Bank 1)
  • P0171 System Too Lean (Bank 1)
  • P0173 Fuel Trim (Bank 2)
  • P0174 System Too Lean (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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