PowertrainP1128
CautionSeverity: Caution - get it checked when you can
Closed Loop Fueling Not Achieved (Bank 1)
Key terms: Control module: a small computer that runs one part of the car · 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 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 32
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| BAIC Motor | P1128 | Coolant temperature below thermostat adjustment temperature Brand | Powertrain |
| BMW | P1128 | Signal dropped Brand | Powertrain |
| BYD | P1128 | NO. 297 battery voltage sampling wire loop fault Brand | Powertrain |
| Chery | P1128 | Fuel Trim: Bank 1 (Mult): System too Lean Brand | Powertrain |
| Daewoo | P1128 | Oxygen Sensing Brand | Powertrain |
| Daihatsu | P1128 | Throttle valve lock Brand | Powertrain |
| DFFS | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| DFXK | P1128 | Fuel Trim: Bank 1 (Mult): System too Lean Brand | Powertrain |
| EOBD | P1128 | Motor ETC Brand | Powertrain |
| Ford | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Geely | P1128 | Fuel Trim: Bank 1 (Mult): System too Lean Brand | Powertrain |
| GM | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Holden | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Honda | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Hyundai | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Isuzu | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Land Rover | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Mahindra | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Maserati | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Mazda | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Mitsubishi | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Opel | P1128 | Oxygen Sensing Brand | Powertrain |
| Perodua | P1128 | Throttle valve lock Brand | Powertrain |
| Peugeot | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Porsche | P1128 | Lambdaregelabweichung (durch Kurztest) Bank 1 - Plaus Brand | Powertrain |
| Proton | P1128 | Closed Loop Fueling Not Achieved (Bank 1) SAE | Powertrain |
| Saab | P1128 | Oxygen Sensing Brand | Powertrain |
| Suzuki | P1128 | ETC MOT Brand | Powertrain |
| Tata | P1128 | Air Fuel Adaptation Observations Fault Brand | Powertrain |
| Toyota | P1128 | Upstream Heated Oxygen Sensors (HO2Ss) swapped Brand | Powertrain |
| Volkswagen | P1128 | Fuel Trim 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 7
These 7-character codes are manufacturer-specific variants of P1128 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P112800 | No description available | Powertrain |
| SsangYong | P112800 | High voltage side low during Lower DC-DC Converter (LDC) operation Brand | Powertrain |
| SsangYong | P112801 | Red lamp error Brand | Powertrain |
| Peugeot | P112832 | No description available | Powertrain |
| Peugeot | P112833 | No description available | Powertrain |
| Peugeot | P112896 | No description available | Powertrain |
| Peugeot | P112897 | No description available | Powertrain |
6Related codes
Browse Pxxx codes or P112xx codes.