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Home/DTC Codes/Mitsubishi/Eclipse/2000-2005 2.4L I4/P0031
P0031

HO2S Heater Control Circuit Low Bank 1 Sensor 1

2000-2005 Mitsubishi Eclipse 2.4L I4

Low SeverityPowertrainGeneric (SAE)

Description

The voltage in the Bank 1 Sensor 1 O2 heater circuit is lower than expected.

Symptoms

  • Check Engine Light
  • Extended warmup time
  • Poor cold-start emissions

Common Causes

  • Short to ground in heater circuit
  • Faulty O2 sensor
  • Corroded connector

Diagnostic Steps

  1. Test heater circuit voltage
  2. Check for shorts to ground
  3. Test sensor heater resistance
  4. Inspect connector

Repair Notes

Repair short or replace O2 sensor.

Related Codes

P0030HO2S Heater Control Circuit Bank 1 Sensor 1P0032HO2S Heater Control Circuit High Bank 1 Sensor 1

Other Powertrain Codes

P0031 on Other Vehicles

Mitsubishi 3000GT

1991-1999 3.0L V6

Mitsubishi 3000GT VR-4

1991-1999 3.0L Twin Turbo V6

Mitsubishi 3000GT VR-4

1991-1999 3.0L V6 Twin Turbo

Mitsubishi Colt JP

2002-2012 1.3L I4 4A90

Mitsubishi Colt JP

2002-2012 1.5L I4 4A91

Mitsubishi Diamante

1992-1996 3.0L V6

Mitsubishi Diamante

1997-2004 3.5L V6

Mitsubishi Eclipse

1990-1999 2.0L I4

Common Questions

What does code P0031 mean on a 2000-2005 Mitsubishi Eclipse?

P0031 stands for "HO2S Heater Control Circuit Low Bank 1 Sensor 1". The voltage in the Bank 1 Sensor 1 O2 heater circuit is lower than expected.

What are the symptoms of P0031 on a Mitsubishi Eclipse?

Common symptoms of P0031 include: Check Engine Light, Extended warmup time, Poor cold-start emissions.

What causes P0031 on a 2000-2005 Mitsubishi Eclipse?

Common causes of P0031 include: Short to ground in heater circuit, Faulty O2 sensor, Corroded connector.

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