P2180 — System Too Rich off Idle (Bank 2)
Moderate severityWhat it means
P2180 is stored when the engine control unit sees a fault involving the air–fuel mixture off idle on bank 2. This code is set when the mixture on bank 2 is off once the engine is off idle and under load, where airflow and fuel demand are higher. “Rich” means the exhaust shows too much fuel (or too little air), and the control unit has run out of room to remove fuel to correct it.
Common symptoms
- Black smoke, a fuel smell or poor economy
- Hesitation or power loss under load
- Higher fuel consumption
- Check engine light
Likely causes
- A leaking injector or high fuel pressure
- A faulty oxygen sensor or a restricted air intake
- A dirty MAF, weak fuel pump or clogged injectors (lean)
- A leaking injector or high fuel pressure (rich)
What to check first
- Check fuel pressure and the injectors for leaks
- Watch fuel trims and oxygen-sensor data in live data
- Watch fuel trims on bank 2 under load in live data
- Check fuel pressure and the MAF reading
Can you keep driving?
Usually drivable, but the wrong mixture wastes fuel and can affect the catalytic converter — diagnose soon.
Frequently asked questions
What is the most common cause of P2180?
The most likely cause is: A leaking injector or high fuel pressure. Several other faults can set P2180 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P2180 and keep driving?
Clearing P2180 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P2180?
P2180 is a moderate-severity code. The car is often still drivable, but have it diagnosed soon — the underlying problem can get worse and it may fail an emissions test.
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