P0134
O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
1995-1999 BMW 318ti E36 1.9L I4 🇨🇦
Moderate SeverityPowertrain
Description
The upstream O2 sensor on Bank 1 shows no switching activity - the signal is flat.
Symptoms
- Check Engine Light
- Poor fuel economy
- Rich or lean running
- Failed emissions
Common Causes
- Faulty O2 sensor
- Open heater circuit
- Wiring issue
- Exhaust leak
- Fuel system problem preventing closed loop
Diagnostic Steps
- Check O2 sensor voltage (should not be stuck)
- Test heater circuit
- Inspect wiring
- Check for exhaust leaks
Repair Notes
Replace O2 sensor. Check heater circuit and wiring first.
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
P0134 on Other Vehicles
Common Questions
What does code P0134 mean on a 1995-1999 BMW 318ti E36?
P0134 stands for "O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1". The upstream O2 sensor on Bank 1 shows no switching activity - the signal is flat.
What are the symptoms of P0134 on a BMW 318ti E36?
Common symptoms of P0134 include: Check Engine Light, Poor fuel economy, Rich or lean running, Failed emissions.
What causes P0134 on a 1995-1999 BMW 318ti E36?
Common causes of P0134 include: Faulty O2 sensor, Open heater circuit, Wiring issue, Exhaust leak, Fuel system problem preventing closed loop.