PowertrainP20EE
CautionSeverity: Caution - get it checked when you can
SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 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 · 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 | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| BAIC Motor | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Mercedes-Benz | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| BYD | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Chery | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Chrysler | P20EE | SCR NOx catalyst efficiency below threshold bank 1 Brand | Powertrain |
| Daewoo | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| DFFS | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| DFFX | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| DFXK | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| EOBD | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| Ford | P20EE | This service function should be run after the cause and rectification of one or more of the following DTCs has been carried out Brand | Powertrain |
| Geely | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| GM | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Great Wall | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Hafei | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Holden | P20EE | NOx Catalyst Efficiency Below Threshold Brand | Powertrain |
| Hyundai | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| Isuzu | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| Land Rover | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Maserati | P20EE | Selective Catalyst Reduction (SCR) NOx catalyst efficiency below threshold (bank 1 catalyst 1) Brand | Powertrain |
| Mitsubishi | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| Opel | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Peugeot | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| Saab | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| MG (SAIC) | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Smart | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| Suzuki | P20EE | Passive monitoring of SCR effectiveness - range 1 Brand | Powertrain |
| Tata | P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1 Catalyst 1) SAE | Powertrain |
| Toyota | P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Brand | Powertrain |
| Volkswagen | P20EE | SCR NOx catalyst bank 1: efficiency too low; Open or short to plus 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 3
These 7-character codes are manufacturer-specific variants of P20EE and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P20EE00 | Der Wirkungsgrad des SCR-Katalysators (Zylinderreihe 1) ist nicht ausreichend. Brand | Powertrain |
| Sprinter | P20EE00 | Der Wirkungsgrad des SCR-Katalysators (Zylinderreihe 1) ist nicht ausreichend. Brand | Powertrain |
| SsangYong | P20EE92 | Selective Catalytic Reduction (SCR) efficiency low Brand | Powertrain |
6Related codes
Browse Pxxx codes or P20Exx codes.