P0154
O2 Sensor Circuit No Activity Bank 2 Sensor 1
2002-2002 Mazda B2300 2.3L I4
Moderate SeverityPowertrainGeneric (SAE)
The 2002 Mazda B2300 is equipped with a 2.3L inline-4 engine. Below you'll find detailed p0154 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
No switching activity from the upstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
- Poor fuel economy
Common Causes
- Faulty sensor
- Heater failure
- Wiring open
Diagnostic Steps
- Test sensor signal
- Check heater
- Inspect wiring
Repair Notes
Replace O2 sensor.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0154 on Other Vehicles
Common Questions
What does code P0154 mean on a 2002-2002 Mazda B2300?
P0154 stands for "O2 Sensor Circuit No Activity Bank 2 Sensor 1". No switching activity from the upstream O2 sensor on Bank 2.
What are the symptoms of P0154 on a Mazda B2300?
Common symptoms of P0154 include: Check Engine Light, Poor fuel economy.
What causes P0154 on a 2002-2002 Mazda B2300?
Common causes of P0154 include: Faulty sensor, Heater failure, Wiring open.
Last updated: March 2026