PowertrainP0430
CautionSeverity: Caution - get it checked when you can
Catalyst System Efficiency Below Threshold (Bank 2)
Key terms: Catalytic converter: cleans the exhaust gases · Oxygen sensor: measures oxygen in the exhaust gas · 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 catalytic converter on the second bank of cylinders is not cleaning the exhaust as well as it should.
2Common causes
- Ageing or failed catalytic converter
- Faulty oxygen sensor behind the converter
- Exhaust leak before the converter
- Engine running rich or misfiring and damaging the converter
- Oil or coolant burning in the exhaust
3Can I drive?
Usually safe to drive. The car will fail an emissions test and fuel economy may be slightly worse. Have the underlying cause diagnosed first.
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 39
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| BAIC Motor | P0430 | Catalyst System Efficiency Below Threshold Bank 2 Brand | Powertrain |
| Mercedes-Benz | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| BMW | P0430 | Catalytic-converter efficiency too low Brand | Powertrain |
| BYD | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Chery | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Chrysler | P0430 | Catalytic conversion, catalytic converter 3 Brand | Powertrain |
| Daewoo | P0430 | Catalyst System Low Efficiency Brand | Powertrain |
| Daihatsu | P0430 | Catalyst deterioration 2 Brand | Powertrain |
| DFFS | P0430 | Catalyst System Efficiency Below Threshold Bank 2 Brand | Powertrain |
| DFFX | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| DFXK | P0430 | Catalyst System Efficiency Below Threshold Bank 2 Brand | Powertrain |
| EOBD | P0430 | Efektivita katalyzátora pod prahom bank 2 Brand | Powertrain |
| Ford | P0430 | 1998 EXPLORER: DRIVEABILITY - MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - DIAGNOSTIC TROUBLE CODES (DTCs) P0420 AND/OR Brand | Powertrain |
| Geely | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| GM | P0430 | Catalyst system low efficiency bank 2 Brand | Powertrain |
| Great Wall | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Hafei | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Holden | P0430 | Catalyst System Low Efficiency Bank 2 Brand | Powertrain |
| Honda | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Hyundai | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Isuzu | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Land Rover | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Maserati | P0430 | Catalyst system efficiency below threshold (bank 2) Brand | Powertrain |
| Mazda | P0430 | 1998 EXPLORER: DRIVEABILITY - MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - DIAGNOSTIC TROUBLE CODES (DTCs) P0420 AND/OR Brand | Powertrain |
| Mitsubishi | P0430 | Catalyst deterioration Brand | Powertrain |
| Nissan | P0430 | TW catalyst system Brand | Powertrain |
| Opel | P0430 | Catalyst system low efficiency bank 2 Brand | Powertrain |
| Perodua | P0430 | Catalyst deterioration 2 Brand | Powertrain |
| Peugeot | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Porsche | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Proton | P0430 | Catalyst deterioration Brand | Powertrain |
| Saab | P0430 | Catalyst system low efficiency bank 2 Brand | Powertrain |
| MG (SAIC) | P0430 | Catalyst System Efficiency Below Threshold Bank 2 Brand | Powertrain |
| Subaru | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) SAE | Powertrain |
| Suzuki | P0430 | Catalyst System Efficiency Below Threshold (Bank 2) Brand | Powertrain |
| Tata | P0430 | Catalyst System Efficiency Below Threshold Bank 2 Brand | Powertrain |
| Toyota | P0430 | Three-way catalytic conversion (TWC) system (bank 2) Brand | Powertrain |
| Volkswagen | P0430 | Catalyst System 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 P0430 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P043000 | Der Wirkungsgrad des Katalysators (Zylinderreihe 2) ist nicht ausreichend. Brand | Powertrain |
| Porsche | P043000 | Ratio less than 1 = limit value undershot = fault entry Brand | Powertrain |
| SsangYong | P043000 | Front and rear exhaust gas temperature sensor - excessive temperature value difference Brand | Powertrain |
6Related codes
Browse Pxxx codes or P043xx codes.