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Home/DTC Codes/Lincoln/MKX/2014-2014 3.7L V6/P0140
P0140

O2 Sensor Circuit No Activity Bank 1 Sensor 2

2014-2014 Lincoln MKX 3.7L V6

Moderate SeverityPowertrainGeneric (SAE)

The 2014 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed p0140 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

The downstream O2 sensor on Bank 1 shows no switching activity.

Symptoms

  • Check Engine Light
  • No catalyst monitoring

Common Causes

  • Faulty sensor
  • Heater circuit failure
  • Wiring open

Diagnostic Steps

  1. Test sensor voltage
  2. Check heater
  3. Inspect wiring

Repair Notes

Replace downstream O2 sensor.

Related Codes

P0136O2 Sensor Circuit Bank 1 Sensor 2P0141O2 Sensor Heater Circuit Bank 1 Sensor 2

Other Powertrain Codes

P0140 on Other Vehicles

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2020-2020 3.0L V6 Twin Turbo

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2021-2021 3.0L Twin-Turbo V6

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2021-2021 3.0L V6 Twin Turbo

Common Questions

What does code P0140 mean on a 2014-2014 Lincoln MKX?

P0140 stands for "O2 Sensor Circuit No Activity Bank 1 Sensor 2". The downstream O2 sensor on Bank 1 shows no switching activity.

What are the symptoms of P0140 on a Lincoln MKX?

Common symptoms of P0140 include: Check Engine Light, No catalyst monitoring.

What causes P0140 on a 2014-2014 Lincoln MKX?

Common causes of P0140 include: Faulty sensor, Heater circuit failure, Wiring open.

Last updated: March 2026

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