P164B Ford Code - O2 Sensor Positive Current Trim Circuit Performance Bank 2 Sensor 1

P164B indicates an issue with the O2 Sensor Positive Current Trim Circuit Performance for Bank 2 Sensor 1. It suggests the sensor is not operating within the expected range.

Symptoms may include poor fuel efficiency, rough idling, reduced engine performance, the check engine light turning on, and possibly increased emissions.

Common causes include a faulty oxygen sensor (Bank 2 Sensor 1), damaged wiring or connectors, an exhaust leak near the sensor, or an issue with the engine control module (ECM).

Bank 2 Sensor 1 is the upstream O2 sensor on the side of the engine opposite Bank 1, typically monitoring the air-fuel ratio before the catalytic converter.

Yes, a faulty or failing O2 sensor is one of the most common causes of the P164B code.

While the vehicle may still run, driving with this code can lead to poor performance, increased emissions, and potential damage to the catalytic converter if not addressed promptly.

A mechanic will use a scan tool to confirm the code, inspect the wiring and connectors for damage, test the oxygen sensor, and check for exhaust leaks or ECM issues.

Repairs may involve replacing the faulty oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or, in rare cases, reprogramming or replacing the ECM.

Replacing an oxygen sensor typically costs $100–$300, depending on the vehicle and labor rates. Additional repairs for wiring or exhaust issues may increase the cost.

While a dirty air filter is unlikely to directly cause this code, it can contribute to poor air-fuel mixture issues, which might affect oxygen sensor performance over time.