PowertrainP20EF
CautionSeverity: Caution - get it checked when you can
SCR NOx pre- catalyst efficiency below threshold bank 1
Key terms: Catalytic converter: cleans the exhaust gases · Control module: a small computer that runs one part of the car · Bank 1: the side of the engine containing cylinder 1 · 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 21
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P20EF | Hybrid Battery. Control Module 16. Incorrect Or Intermittent Data Brand | Powertrain |
| BAIC Motor | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Mercedes-Benz | P20EF | No description available | Powertrain |
| BYD | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Chery | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| DFFS | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| DFFX | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| DFXK | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| EOBD | P20EF | No description available | Powertrain |
| Geely | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| GM | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Great Wall | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Hafei | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Hyundai | P20EF | No description available | Powertrain |
| Isuzu | P20EF | No description available | Powertrain |
| Land Rover | P20EF | SCR NOx Pre-Catalyst Efficiency Below Threshold Brand | Powertrain |
| Peugeot | P20EF | No description available | Powertrain |
| Saab | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| MG (SAIC) | P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Smart | P20EF | No description available | Powertrain |
| Toyota | P20EF | SCR NOx pre- catalyst efficiency below threshold bank 1 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.
5Related codes
Browse Pxxx codes or P20Exx codes.