HO2S Heater Control Circuit Bank 1 Sensor 1
2018-2025 Fiat Cronos 1.0L I4 Flex Firefly
Description
The PCM detected a malfunction in the heater circuit of the upstream heated oxygen sensor (Bank 1, Sensor 1).
Symptoms
- Check Engine Light
- Poor fuel economy
- Longer warmup emissions
- Failed emissions test
Common Causes
- Faulty O2 sensor heater
- Blown fuse
- Wiring issue
- PCM heater driver failure
Diagnostic Steps
- Check O2 sensor heater fuse
- Test heater circuit resistance (should be 2-30 ohms)
- Inspect wiring to sensor
- Check PCM heater control output
Repair Notes
Replace O2 sensor if heater resistance is out of spec. Check fuse 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
P0030 on Other Vehicles
Fiat 124 Spider
2017-2020 1.4L I4 Turbo
Fiat 126p Maluch
1973-2000 0.65L I2 Air-Cooled
Fiat 126p Maluch
1987-2000 0.7L I2 Air-Cooled
Fiat 500
2012-2019 1.4L I4
Fiat 500 Abarth
2012-2019 1.4L I4 Turbo
Fiat 500 BR
2011-2020 1.4L I4 Flex Fire Evo
Fiat 500 PL
2007-2025 1.0L I3 Hybrid FireFly 70
Fiat 500 PL
2007-2025 1.2L I4 Fire 69
Common Questions
What does code P0030 mean on a 2018-2025 Fiat Cronos?
P0030 stands for "HO2S Heater Control Circuit Bank 1 Sensor 1". The PCM detected a malfunction in the heater circuit of the upstream heated oxygen sensor (Bank 1, Sensor 1).
What are the symptoms of P0030 on a Fiat Cronos?
Common symptoms of P0030 include: Check Engine Light, Poor fuel economy, Longer warmup emissions, Failed emissions test.
What causes P0030 on a 2018-2025 Fiat Cronos?
Common causes of P0030 include: Faulty O2 sensor heater, Blown fuse, Wiring issue, PCM heater driver failure.