Fault code lookup

PowertrainP1121

Caution

Severity: Caution - get it checked when you can

Throttle Position Sensor Inconsistent With Mass Air Flow Sensor

36 brands affected · Generic SAE J2012 description.

Key terms: Mass air flow sensor: measures the air going into the engine · Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · 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

  1. Sensor or actuator fault
  2. Wiring or connector fault
  3. Vacuum or intake leak
  4. Fuel or ignition problem
  5. 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

BrandCodeDescriptionSystem
Ashok Leyland CVP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
BMWP1121implausible values BrandPowertrain
BYDP1121ETV motor relay BrandPowertrain
CheryP1121ETV motor relay BrandPowertrain
DaewooP1121Oxygen Sensor Heating BrandPowertrain
DaihatsuP1121Accelerator sensor characteristic abnormal BrandPowertrain
DFFSP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
DFFXP1121ETV motor relay BrandPowertrain
DFXKP1121Air Flow Meter (HFM) Air Flow Above Upper Limit BrandPowertrain
EOBDP1121Pemacu ETC BrandPowertrain
FordP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
GeelyP1121ETV motor relay BrandPowertrain
GMP1121Oxygen Sensor Heating BrandPowertrain
Great WallP1121ETV motor relay BrandPowertrain
HafeiP1121ETV motor relay BrandPowertrain
HoldenP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
HondaP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
HyundaiP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
IsuzuP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
Land RoverP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
MahindraP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
MaseratiP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
MazdaP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
MitsubishiP1121ETV motor relay BrandPowertrain
OpelP1121Oxygen Sensor Heating BrandPowertrain
PeroduaP1121Accelerator sensor characteristic abnormal BrandPowertrain
PeugeotP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
PorscheP1121Drosselklappensteller Potentiometer 1: unplausibles Signal BrandPowertrain
ProtonP1121ETV motor relay BrandPowertrain
SaabP1121Oxygen Sensor Heating BrandPowertrain
SmartP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
SubaruP1121Throttle Position Sensor Inconsistent With Mass Air Flow Sensor SAEPowertrain
SuzukiP1121ETC ACTR BrandPowertrain
TataP1121Pedal Sensor Fault BrandPowertrain
ToyotaP1121Throttle position sensor circuit intermittent high BrandPowertrain
VolkswagenP1121Oxygen (Lambda) sensor heating circuit: B2 S2: short to ground 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 2

These 7-character codes are manufacturer-specific variants of P1121 and may be reported by some scan tools.

BrandCodeDescriptionSystem
SsangYongP112100Pedal fault correlation: track 2 too much over track 1 BrandPowertrain
SsangYongP112107Cooling fan fault BrandPowertrain

6Related codes

  • P1120 Throttle Position Sensor Out of Range
  • P1122 Signal too small
  • P1123 Signal too large
  • P1124 Throttle Position Sensor Out of Self-Test Range
  • P1125 Electronic throttle position sensor (TPS)
  • P1126 Throttle position (narrow range) sensor circuit
  • P1127 Signal implausible
  • P1128 Closed Loop Fueling Not Achieved (Bank 1)
  • P1129 Closed Loop Fueling Not Achieved (Bank 2)
  • P112A NO. 299 battery voltage sampling wire loop fault
  • P112B NO. 300 battery voltage sampling wire loop fault
  • P112C NO. 301 battery voltage sampling wire loop fault

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