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Home/DTC Codes/Mazda/CX-3/2016-2021 2.0L I4/P0157
P0157

O2 Sensor Circuit Low Voltage Bank 2 Sensor 2

2016-2021 Mazda CX-3 2.0L I4 🇩🇪

Moderate SeverityPowertrain

Description

Low voltage from the downstream O2 sensor on Bank 2.

Symptoms

  • Check Engine Light

Common Causes

  • Faulty sensor
  • Short to ground
  • Exhaust leak

Diagnostic Steps

  1. Test voltage
  2. Check for shorts

Repair Notes

Replace sensor.

Related Codes

P0156O2 Sensor Circuit Bank 2 Sensor 2P0158O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Other Powertrain Codes

P0157 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 P0157 mean on a 2016-2021 Mazda CX-3?

P0157 stands for "O2 Sensor Circuit Low Voltage Bank 2 Sensor 2". Low voltage from the downstream O2 sensor on Bank 2.

What are the symptoms of P0157 on a Mazda CX-3?

Common symptoms of P0157 include: Check Engine Light.

What causes P0157 on a 2016-2021 Mazda CX-3?

Common causes of P0157 include: Faulty sensor, Short to ground, Exhaust leak.

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