ShopBaseFree forever shop management software for auto repair shops
Try ShopBase Free →
Home/DTC Codes/Mazda/CX-3/2016-2021 2.0L I4/P0156
P0156

O2 Sensor Circuit Bank 2 Sensor 2

2016-2021 Mazda CX-3 2.0L I4 🇩🇪

Moderate SeverityPowertrain

Description

General malfunction in the downstream O2 sensor on Bank 2.

Symptoms

  • Check Engine Light
  • Failed emissions

Common Causes

  • Faulty sensor
  • Wiring issue
  • Exhaust leak

Diagnostic Steps

  1. Test sensor voltage
  2. Inspect wiring
  3. Check for leaks

Repair Notes

Replace sensor.

Related Codes

P0157O2 Sensor Circuit Low Voltage Bank 2 Sensor 2P0158O2 Sensor Circuit High Voltage Bank 2 Sensor 2P0159O2 Sensor Circuit Slow Response Bank 2 Sensor 2P0160O2 Sensor Circuit No Activity Bank 2 Sensor 2P0161O2 Sensor Heater Circuit Bank 2 Sensor 2

Other Powertrain Codes

P0156 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 P0156 mean on a 2016-2021 Mazda CX-3?

P0156 stands for "O2 Sensor Circuit Bank 2 Sensor 2". General malfunction in the downstream O2 sensor on Bank 2.

What are the symptoms of P0156 on a Mazda CX-3?

Common symptoms of P0156 include: Check Engine Light, Failed emissions.

What causes P0156 on a 2016-2021 Mazda CX-3?

Common causes of P0156 include: Faulty sensor, Wiring issue, Exhaust leak.

View Labor Times | View Torque Specs | View Fluid Specs