P2190System Too Rich at Idle (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2190 is the bank 2 counterpart of P2188: the long-term trim of bank 2 has to remove more fuel than allowed at idle and low load. GM's 2008 3.6 LLT sets it below -6.0 % in the same window it uses for P2188 (520 to 1120 rpm, 1.7 to 7.8 g/s, closed loop, coolant above 60 °C, catalyst heating not active), and GM's 2005 2.8 and 3.6 V6 treat it in the same additive adaptation range. A rich fault on bank 2 only usually lies in that bank: a leaking injector, or a bank 2 front sensor reading lean so the ECM keeps leaning the mixture. Fuel pressure, purge vapour and air-mass errors act on both banks and tend to set P2188 and P2190 together. Stellantis is an example: an airflow straightener clipped in wrong in the air box upset the air mass reading and logged P2188 and P2190 together, sometimes with P0111 and an unstable idle; refitting it correctly cured it.
- What you may notice
- Malfunction indicator lamp on
- Rough idle, fuel smell
- Likely causes
- PossibleLeaking injector on bank 2
- PossibleShared cause such as air mass error or purge vapour, usually with P2188 too
- RareBank 2 front sensor reading lean
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.