O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

What is P0141?

P0141 indicates a problem with the heater circuit in the oxygen sensor located after the catalytic converter (Bank 1, Sensor 2). This is a medium-severity powertrain issue that can affect emissions and fuel economy, and it's most commonly reported in Honda Accords and Ford Mustangs based on owner data. The code is triggered when the vehicle's computer detects an electrical fault in the sensor's internal heating element.

Common Causes

• ●A failed oxygen sensor heater element is the most common cause, requiring sensor replacement.
• ●Wiring damage or corrosion in the sensor's electrical connector or harness can interrupt the heater circuit.
• ●A blown fuse or faulty relay supplying power to the sensor heater can cause the circuit malfunction.

Symptoms You May Notice

• ●The check engine light is illuminated, which is the primary symptom owners notice.
• ●There may be no noticeable driving symptoms, as this code often doesn't affect performance immediately.
• ●Some owners report slightly decreased fuel economy over time when this code is present.

How to Fix It

• ●Replace the downstream oxygen sensor (Bank 1, Sensor 2) ($150-$400, medium difficulty)
• ●Repair or replace damaged wiring or connectors in the oxygen sensor circuit ($100-$300, medium difficulty)
• ●Replace a blown fuse or faulty relay for the oxygen sensor heater circuit ($20-$100, easy difficulty)