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Home/DTC Codes/Mazda/CX-3/2016-2021 2.0L I4/P0038
P0038

HO2S Heater Control Circuit High Bank 1 Sensor 2

2016-2021 Mazda CX-3 2.0L I4

Low SeverityPowertrainGeneric (SAE)

Description

The voltage in the Bank 1 Sensor 2 O2 heater circuit is higher than expected.

Symptoms

  • Check Engine Light
  • Possible overheating

Common Causes

  • Short to power
  • Faulty sensor
  • Relay issue

Diagnostic Steps

  1. Test heater voltage
  2. Check for shorts to power
  3. Test resistance

Repair Notes

Repair short or replace sensor.

Related Codes

P0036HO2S Heater Control Circuit Bank 1 Sensor 2P0037HO2S Heater Control Circuit Low Bank 1 Sensor 2

Other Powertrain Codes

P0038 on Other Vehicles

Mazda 626

1993-1997 2.0L I4

Mazda 626

1993-1997 2.5L V6

Mazda 626

1998-2002 2.0L I4

Mazda 626

1998-2002 2.5L V6

Mazda Axela

2013-2019 1.5L I4 P5-VPS

Mazda B2300

1994-1997 2.3L I4

Mazda B2300

2002-2009 2.3L I4

Mazda B2500

1998-2001 2.5L I4

Common Questions

What does code P0038 mean on a 2016-2021 Mazda CX-3?

P0038 stands for "HO2S Heater Control Circuit High Bank 1 Sensor 2". The voltage in the Bank 1 Sensor 2 O2 heater circuit is higher than expected.

What are the symptoms of P0038 on a Mazda CX-3?

Common symptoms of P0038 include: Check Engine Light, Possible overheating.

What causes P0038 on a 2016-2021 Mazda CX-3?

Common causes of P0038 include: Short to power, Faulty sensor, Relay issue.

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