PowertrainP1129
CautionSeverity: Caution - get it checked when you can
Closed Loop Fueling Not Achieved (Bank 2)
Key terms: Control module: a small computer that runs one part of the car · 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 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?
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 31
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P1129 | Air Assisted Injector Control Circuit. Low Signal Brand | Powertrain |
| BMW | P1129 | Oil level too low Brand | Powertrain |
| BYD | P1129 | NO. 298 battery voltage sampling wire loop fault Brand | Powertrain |
| Chery | P1129 | Fuel Trim: Bank 2 (Mult): System too Rich Brand | Powertrain |
| Daewoo | P1129 | Oxygen Sensing Brand | Powertrain |
| Daihatsu | P1129 | Electric throttle system failure 1 Brand | Powertrain |
| DFFS | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| DFXK | P1129 | Fuel Trim: Bank 2 (Mult): System too Rich Brand | Powertrain |
| EOBD | P1129 | Happianturi Brand | Powertrain |
| Ford | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Geely | P1129 | Fuel Trim: Bank 2 (Mult): System too Rich Brand | Powertrain |
| GM | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Holden | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Honda | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Hyundai | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Isuzu | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Land Rover | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Mahindra | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Maserati | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Mazda | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Mitsubishi | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Nissan | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Opel | P1129 | Oxygen Sensing Brand | Powertrain |
| Perodua | P1129 | Electric throttle system failure 1 Brand | Powertrain |
| Peugeot | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Porsche | P1129 | Lambdaregelungsadaption Bereich 2 - Mageranschlag Brand | Powertrain |
| Proton | P1129 | Closed Loop Fueling Not Achieved (Bank 2) SAE | Powertrain |
| Saab | P1129 | Oxygen Sensing Brand | Powertrain |
| Suzuki | P1129 | ETC MOT GND Brand | Powertrain |
| Toyota | P1129 | Downstream Heated Oxygen Sensors (HO2Ss) swapped Brand | Powertrain |
| Volkswagen | P1129 | bank 2 (Mult): system too rich; Short to ground 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 8
These 7-character codes are manufacturer-specific variants of P1129 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P112900 | No description available | Powertrain |
| SsangYong | P112900 | High voltage on low voltage side during Lower DC-DC Converter (LDC) operation Brand | Powertrain |
| SsangYong | P112901 | Blue lamp error Brand | Powertrain |
| Peugeot | P112916 | No description available | Powertrain |
| Peugeot | P112951 | No description available | Powertrain |
| Peugeot | P112952 | No description available | Powertrain |
| Peugeot | P112953 | No description available | Powertrain |
| Peugeot | P112978 | No description available | Powertrain |
6Related codes
Browse Pxxx codes or P112xx codes.