Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0134Rear Air Fuel Ratio Sensor [Bank 1, Sensor 1]Heater System Malfunction
P0134Rear Air Fuel Ratio Sensor [Bank 1, Sensor 1] Heater System Malfunction
P0134Air Fuel Ratio Sensor [Bank 1, Sensor 1]Heater System Malfunction
Manufacturer communications
51Original wording in English
HONDA
Service Bulletin - The engine runs rough and makes a rattling noise, accompanied by DTC P0134 or P0135 due to a possible fuel injector leak causing a rich air/fuel (A/F) mixture that fouls the spark plug(s) and causing the PCM to misread the A/F sensor heater resistance. Other DTCs may also include: P0700, P0300, P219C, P219D, P…
HARLEY-DAVIDSON
GENUINE MOTOR PARTS AND ACCESSORIES BULLETIN PAB1081: SCREAMIN' EAGLE UPDATES. Purpose: To inform dealers of Screamin' Eagle® Pro Street Tuner software changes related to Stage II for Trike models and Smart Tune PRO improvements. The Screamin? Eagle team has identified and corrected integration issues which have triggered false …
LAND ROVER
"ISSUE: THE CUSTOMER MAY OBSERVE A MIL IN THE INSTRUMENT CLUSTER RELATING TO THE ENGINE SYSTEM (CHECK ENGINE LIGHT) AND ONE OR MORE CODES STORED IN THE PCM RELATING TO HEATED OXYGEN SENSOR (HO2S) IN THE EXHAUST SYSTEM. THE CODE WILL REFER TO A FAULT WITH THE PRE, OR MID, OR POST CATALYST HEATED OXYGEN SENSOR: P0030, P0031, P00D1…
ACURA
SERVICE BULLETIN - THE MIL COMES ON WITH DTC P0134 (REAR A/F SENSOR [BANK 1, SENSOR 1] HEATER SYSTEM MALFUNCTION) AND/OR P0154 (FRONT A/F SENSOR [BANK 2, SENSOR 1] HEATER SYSTEM MALFUNCTION).
Check vehicle applicability
66A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.