P2190: System Too Rich at Idle Bank 2
What to do
Expect a rough idle and a smell of fuel. If only this bank is rich, the shared explanations — cold running, fuel pressure, the purge valve — are ruled out, and the cause is on this side of the engine: an injector, or the oxygen sensor reading it.
What this code means
The rich-at-idle condition of P2188, on the second cylinder bank. The reasoning is unchanged and the temperature check named there — an engine that never warms up is commanded rich on purpose — applies equally.
One addition specific to a single bank being rich while the other is not: a cold engine or a faulty coolant temperature sensor affects both banks, and shared fuel pressure affects both banks. So a rich condition confined to one bank rules those out immediately and leaves the hardware belonging to that side — its injectors, and the sensor watching it.
Likely causes
Start here
- Leaking fuel injector · moderate
- Faulty oxygen sensor · moderate
Less common
- Excessive fuel pressure · moderate
- Faulty EVAP purge valve · easy
- Thermostat stuck open · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P2190.