P0134
O2 Sensor Circuit No Activity (Bank 1 Sensor 1)
System: Emissions
Severity: medium
What does P0134 mean?
The DTC P0134 (O2 Sensor Circuit No Activity (Bank 1 Sensor 1)) is a fault code stored by the ECU when it detects a O2 B1S1 inactive condition in the emissions subsystem. It is commonly seen on European and Asian vehicles using Bosch, Continental, Siemens or Denso ECUs.
Common causes of P0134
- Failed sensor heater
- Disconnected sensor
- ECU heater driver fault
- Wiring open
How to fix P0134
Heater resistance test: should be 4-10Ω cold. Replace sensor if open.
Tuning approach with DaVinci Deluxe
For P0134, DaVinci Deluxe offers the following ECU map adjustments and software solutions:
- Heater monitor disable (race)
- Lambda regulation off
Need to fix P0134 on your ECU?
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