P2193: System Too Lean at Higher Load (Bank 2)

What it means

The engine control module detects a lean air-fuel mixture on bank 2 at higher engine load. The code identifies the operating condition; it does not by itself establish a fuel-supply restriction.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The engine control module estimates the air-fuel mixture on bank 2 from oxygen-sensor feedback and fuel trims. P2193 sets when bank 2 is detected as too lean at higher engine load, when fuel demand increases; it can arise from inadequate fuel delivery or a bank-specific air-measurement or intake problem.

Common causes

Most likely first.

1. Fuel pump weak under load
2. Fuel filter clogged

Symptoms

• Check engine light on
• Rough idle, possible stalling
• Hesitation or hard cold start
• Power loss under load

How to diagnose it

1. Review freeze-frame data and compare bank 2 fuel trims at idle with readings under load to confirm the lean condition is tied to higher demand.
2. Check for related fuel-pressure, airflow, intake-leak, and oxygen-sensor codes and compare bank 2 readings with bank 1.
3. Inspect the intake tract and bank 2 air path for loose connections or leaks that could affect mixture readings.
4. Monitor mass-airflow and oxygen-sensor data during a controlled load increase to see whether the readings support a bank 2 lean condition.
5. Measure fuel pressure and delivery under load using the manufacturer's procedure to check for a weak pump or restricted filter.

Common fixes

• Repair a leaking intake connection affecting bank 2 mixture readings.
• Replace a clogged fuel filter if testing confirms restricted delivery.
• Repair or replace a weak fuel pump if fuel pressure or flow is inadequate under load.
• Repair a bank 2 sensor circuit fault if testing shows it is causing a false lean indication.

Can I keep driving?

Avoid hard acceleration, towing, and steep climbs because the bank 2 lean condition appears under higher load and can cause hesitation or power loss. Stop driving if the engine misfires, overheats, or stalls.