What does code P1135 mean on BMW vehicles?
The heater circuit of the upstream oxygen sensor on bank 1 has lower than expected voltage, resulting in slow sensor warm-up.
OBD-II Code BMW
P1135 — BMW — Oxygen Sensor Heater Circuit Low Voltage (Bank 1 Sensor 1)
The heater circuit of the upstream oxygen sensor on bank 1 has lower than expected voltage, resulting in slow sensor warm-up.
Common symptoms
- Delayed sensor operation
- possible check engine light
Possible causes
- Low battery voltage
- wiring resistance
- poor ground
Initial recommendation
Check battery voltage, inspect heater circuit wiring and grounds.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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