P2191 KIA Code - System Too Lean At Higher Load Bank 1

P2191 indicates that the engine's fuel system is running too lean on Bank 1 during higher load conditions, meaning there is too much air and not enough fuel in the mixture.

Symptoms include reduced engine performance, hesitation during acceleration, rough idling, poor fuel economy, or the Check Engine Light illuminating.

Common causes include a vacuum leak, a faulty mass airflow (MAF) sensor, a clogged fuel injector, low fuel pressure, or an exhaust leak upstream of the oxygen sensor.

While rare, a severely clogged air filter can restrict airflow and contribute to a lean condition, but it is not a primary cause.

Start by inspecting for vacuum leaks, checking the MAF sensor for contamination, testing fuel pressure, and inspecting the oxygen sensor and exhaust system for leaks or damage.

Driving with a P2191 code for an extended period can damage the engine or catalytic converter, so it’s recommended to address the issue promptly.

Repairs may include fixing vacuum leaks, cleaning or replacing the MAF sensor, replacing faulty fuel injectors, or repairing exhaust leaks.

Yes, a failing fuel pump can result in low fuel pressure, which may cause the engine to run lean and trigger the P2191 code.

You’ll need an OBDII scanner, a fuel pressure gauge, and possibly a smoke machine to detect vacuum leaks.

In some cases, a reflash or software update from the manufacturer can resolve fuel mixture issues if the problem stems from incorrect ECU programming.