P2198 2006 Ford Fusion Code - Oxygen Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1

P2198 indicates that the Bank 2 Sensor 1 oxygen sensor is detecting a consistently rich air-fuel mixture, meaning there is too much fuel and not enough air in the combustion process.

Common symptoms include reduced fuel economy, rough idling, hesitation during acceleration, black smoke from the exhaust, and the check engine light being illuminated.

Potential causes include a faulty Bank 2 Sensor 1 oxygen sensor, exhaust leaks, vacuum leaks, a malfunctioning fuel injector, a dirty mass airflow sensor, or a defective fuel pressure regulator.

While the car may still be drivable, prolonged driving with this issue can lead to increased fuel consumption, poor performance, and potential damage to the catalytic converter.

Repairs might include replacing the Bank 2 Sensor 1 oxygen sensor, repairing exhaust or vacuum leaks, cleaning the mass airflow sensor, or addressing issues with the fuel system such as cleaning the injectors or replacing the fuel pressure regulator.

Bank 2 refers to the side of the engine opposite the cylinder with the number one spark plug, and Sensor 1 is the upstream oxygen sensor located before the catalytic converter.

Yes, a clogged air filter can restrict airflow, contributing to a rich air-fuel mixture and triggering the P2198 code.

Not necessarily. While a faulty sensor is a common cause, other issues like exhaust leaks, fuel system problems, or a bad mass airflow sensor can also trigger this code.

Repair costs vary, but replacing an oxygen sensor typically costs $150–$300, while addressing other potential issues like fuel system repairs or exhaust leaks may cost more.

While not a common cause, a clogged or failing catalytic converter can affect exhaust flow and contribute to a rich condition, potentially triggering the P2198 code.