P0431
Warm Up Catalyst Efficiency Below Threshold Bank 2
2018-2025 Fiat Cronos 1.3L I4 Flex Firefly
Moderate SeverityPowertrainGeneric (SAE)
Description
Bank 2 warm-up catalyst efficiency is below threshold.
Symptoms
- Check Engine Light
- Failed emissions
Common Causes
- Worn catalyst
- Rich running during warmup
- O2 sensor issue
Diagnostic Steps
- Monitor catalyst
- Compare O2 signals
- Check exhaust
Repair Notes
Replace warm-up catalyst if confirmed.
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
P0431 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 P0431 mean on a 2018-2025 Fiat Cronos?
P0431 stands for "Warm Up Catalyst Efficiency Below Threshold Bank 2". Bank 2 warm-up catalyst efficiency is below threshold.
What are the symptoms of P0431 on a Fiat Cronos?
Common symptoms of P0431 include: Check Engine Light, Failed emissions.
What causes P0431 on a 2018-2025 Fiat Cronos?
Common causes of P0431 include: Worn catalyst, Rich running during warmup, O2 sensor issue.