P0172 2016 Chevrolet Silverado Code - Fuel Trim System Rich Bank 1

The P0172 code indicates that the engine's control module has detected a rich air-fuel mixture on Bank 1, meaning there's too much fuel or insufficient air.

Symptoms may include poor fuel economy, rough idling, black smoke from the exhaust, difficulty starting, and possibly the smell of fuel.

Common causes include a dirty or faulty mass airflow sensor, a malfunctioning oxygen sensor, a leaking fuel injector, a faulty fuel pressure regulator, or a clogged air filter.

Yes, a clogged air filter can restrict airflow to the engine, causing a rich air-fuel mixture and triggering the P0172 code.

Start by checking for vacuum leaks, inspecting the air filter, mass airflow sensor, and oxygen sensors. Use a scan tool to monitor fuel trims and related data for further diagnosis.

Yes, a faulty upstream oxygen sensor can send incorrect signals to the engine control module, leading to a rich air-fuel mixture and triggering the P0172 code.

While it may be possible to drive, operating the vehicle with a rich air-fuel mixture can damage the catalytic converter and cause further engine issues if not addressed promptly.

Repairs may include cleaning or replacing the mass airflow sensor, replacing the oxygen sensor, fixing vacuum leaks, servicing the fuel injectors, or replacing the air filter.

Yes, a leaking or stuck-open fuel injector can cause too much fuel to enter the combustion chamber, resulting in a rich condition.

Clearing the code will temporarily erase it, but unless the underlying issue is resolved, the code is likely to return.