P0175 2016 Chevrolet Silverado Code - Fuel Trim System Rich Bank 2

P0175 indicates that the fuel mixture on Bank 2 (passenger side of the engine) is too rich, meaning there is too much fuel and not enough air.

Symptoms may include reduced fuel efficiency, black smoke from the exhaust, rough idling, hesitation during acceleration, and the check engine light turning on.

Common causes include a faulty oxygen sensor, dirty or leaking fuel injectors, a malfunctioning mass airflow sensor (MAF), a clogged air filter, or excessive fuel pressure.

Yes, a clogged or dirty air filter can restrict airflow, causing the engine to run rich and triggering the P0175 code.

Repairs may involve cleaning or replacing the mass airflow sensor, replacing the oxygen sensor, cleaning the air filter, checking for fuel injector leaks, or inspecting the fuel pressure regulator.

While the truck may still be drivable, prolonged operation with a rich fuel mixture can cause damage to the catalytic converter and other engine components. Prompt diagnosis and repair are recommended.

Use an OBD-II scanner to confirm the code, inspect the MAF sensor and air filter, check for vacuum leaks, test the oxygen sensors, and measure fuel pressure to identify the root cause.

Bad or contaminated fuel is a less common cause but can contribute to a rich fuel condition, especially if it affects fuel injector performance.

Replacing the oxygen sensor may resolve the issue if it is faulty, but it’s important to diagnose the root cause to avoid replacing unnecessary parts.

Repair costs vary depending on the issue. Replacing an oxygen sensor may cost $150–$300, while cleaning a MAF sensor or air filter is typically less expensive. Complex fuel system repairs may cost more.