OBD code information sheet
https://obdauto.ro/cod/P0135?lang=en
Oxygen sensor heater circuit — bank 1, sensor 1
Available definitions for this code
Choose the correct manufacturer. The same code can have different meanings; a definition without an identified make does not confirm applicability to your vehicle.
General code
Editorially revised in Romanian and English. Causes are possibilities, and checks must follow the engine and manufacturer service information. The code alone does not establish the faulty part or severity.
Sources and documentation
Manufacturer examples do not establish universal thresholds or procedures. Use the exact vehicle service information for repairs.
Supplemented diagnostic guidance
Editorial synthesis of general information from the sources below. Listed causes and components are possibilities to investigate; the code does not confirm a faulty part.
- AUTODOC — components to inspect · Checked:
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Technical explanation
The control unit detects a fault in the upstream oxygen sensor heater on bank 1. This concerns the heater circuit and does not alone establish incorrect mixture sensing.
Symptoms
- Engine warning light; sometimes higher fuel consumption when cold.
Possible causes
- 01Failed sensor heater.
- 02Fuse, power supply, ground or wiring faults.
Diagnostic checks
- 01Identify the correct sensor from the engine layout.
- 02Have heater power and circuit checks performed to manufacturer specifications. Allow the exhaust to cool before work.
Parts involved
- Heated oxygen sensor, wiring and connectors (inspect).
Vehicle associations in the catalogue
Catalogue associations help searching and do not confirm code applicability for every model, year and engine combination. Check the vehicle service information.
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Model
Year
Engine
Repair cost calculator
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Model, year and engine (optional)
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Experiences with this code
User-reported cases published after moderation. Approval does not verify the diagnosis; the same code can have different causes.
No approved English experiences for this definition yet.
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