PowertrainP0134
CautionSeverity: Caution - get it checked when you can
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
Key terms: Catalytic converter: cleans the exhaust gases · Oxygen sensor: measures oxygen in the exhaust gas · 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 oxygen sensor before the catalytic converter is not showing any activity, so the engine computer cannot fine-tune the fuel mixture.
2Common causes
- Faulty oxygen sensor
- Blown oxygen sensor heater fuse
- Damaged wiring or connector
- Exhaust leak before the sensor
- Engine control module fault
3Can I drive?
Usually safe to drive gently. Fuel economy may drop and emissions worsen; have it checked soon.
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 44
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| BAIC Motor | P0134 | Front O2 Sensor Open Brand | Powertrain |
| Mercedes-Benz | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| BMW | P0134 | Open circuit Brand | Powertrain |
| BYD | P0134 | Front O2 sensor circuit open Brand | Powertrain |
| Chery | P0134 | Front oxygen sensor No Signal Brand | Powertrain |
| Chrysler | P0134 | Oxygen sensor 1/1 circuit open Brand | Powertrain |
| Daewoo | P0134 | O2 Sensor Failed Brand | Powertrain |
| Daihatsu | P0134 | A/F sensor inactive Brand | Powertrain |
| DFFS | P0134 | Front oxygen sensor circuit open Brand | Powertrain |
| DFFX | P0134 | Front oxygen dilute detection Brand | Powertrain |
| DFXK | P0134 | Upstream O2 response too slow Brand | Powertrain |
| EOBD | P0134 | Oxygen sensor circuit no activity detected bank 1 sensor 1 Brand | Powertrain |
| Ford | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Geely | P0134 | Front O2 Sensor Open Brand | Powertrain |
| GM | P0134 | HO2S circuit insufficient activity bank 1 sensor 1 Brand | Powertrain |
| Great Wall | P0134 | Oxygen sensor no activity Brand | Powertrain |
| Hafei | P0134 | Oxygen sensor no activity Brand | Powertrain |
| Holden | P0134 | HO2S Circuit Insufficient Activity Sensor 1 Brand | Powertrain |
| Honda | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Hyundai | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Isuzu | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Land Rover | P0134 | O2 sensor circuit no activity detected Brand | Powertrain |
| Mahindra | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Maserati | P0134 | Oxygen sensor circuit no activity detected (bank 1 sensor 1) Brand | Powertrain |
| Mazda | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Mitsubishi | P0134 | Lambda sensor circuit open Brand | Powertrain |
| Nissan | P0134 | Heated oxygen sensor 1 Brand | Powertrain |
| Opel | P0134 | HO2S circuit insufficient activity bank 1 sensor 1 Brand | Powertrain |
| Perodua | P0134 | A/F sensor inactive Brand | Powertrain |
| Peugeot | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Porsche | P0134 | Lambda-Sonde vor Kat Bank 1: keine Aktivität Brand | Powertrain |
| Proton | P0134 | Lambda sensor circuit open Brand | Powertrain |
| Renault | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Saab | P0134 | HO2S circuit insufficient activity bank 1 sensor 1 Brand | Powertrain |
| MG (SAIC) | P0134 | O2 Sensor Signal Stuck Rich Brand | Powertrain |
| Smart | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Sprinter | P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) SAE | Powertrain |
| Subaru | P0134 | O2 Sensor Circuit (Open) Brand | Powertrain |
| Suzuki | P0134 | O2 sensor circuit no activity detected (Bank 1 Sensor 1) Brand | Powertrain |
| SWM Motor | P0134 | Front O2 sensor circuit open Brand | Powertrain |
| Tata | P0134 | Upstream O2 Sensor Fault Brand | Powertrain |
| Toyota | P0134 | Front oxygen sensor circuit open Brand | Powertrain |
| Volkswagen | P0134 | Oxygen (Lambda) sensor B1 S1: no activity; Electrical fault in circuit 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 P0134 and may be reported by some scan tools.
6Related codes
Browse Pxxx codes or P013xx codes.