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Home/DTC Codes/Fiat/Uno/2010-2021 1.0L I4 Flex Fire Evo/P0174
P0174

System Too Lean Bank 2

2010-2021 Fiat Uno 1.0L I4 Flex Fire Evo

High SeverityPowertrainGeneric (SAE)

Description

The long-term fuel trim for Bank 2 has exceeded the positive limit, indicating lean running on Bank 2.

Symptoms

  • Check Engine Light
  • Rough idle
  • Hesitation
  • Possible misfires

Common Causes

  • Vacuum leak Bank 2 side
  • Low fuel pressure
  • Faulty MAF sensor
  • Exhaust leak Bank 2
  • Clogged injector Bank 2

Diagnostic Steps

  1. Check fuel trim Bank 2
  2. Smoke test Bank 2 intake
  3. Test fuel pressure
  4. Test MAF sensor
  5. Check for exhaust leaks Bank 2

Repair Notes

Same diagnostic approach as P0171 but focused on Bank 2.

Related Codes

P0150O2 Sensor Circuit Bank 2 Sensor 1P0170Fuel Trim Bank 1P0171System Too Lean Bank 1P0175System Too Rich Bank 2

Other Powertrain Codes

P0174 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 P0174 mean on a 2010-2021 Fiat Uno?

P0174 stands for "System Too Lean Bank 2". The long-term fuel trim for Bank 2 has exceeded the positive limit, indicating lean running on Bank 2.

What are the symptoms of P0174 on a Fiat Uno?

Common symptoms of P0174 include: Check Engine Light, Rough idle, Hesitation, Possible misfires.

What causes P0174 on a 2010-2021 Fiat Uno?

Common causes of P0174 include: Vacuum leak Bank 2 side, Low fuel pressure, Faulty MAF sensor, Exhaust leak Bank 2, Clogged injector Bank 2.

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