P2191System Too Lean at Higher Load (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2191 sets once bank 1's long-term trim has run into its enrichment limit in the upper load range, so the engine would be lean there without the correction. It is the third load zone next to P2187 (idle) and P2177 (off idle), and it is where a supply that copes at cruise first falls short: a tired fuel pump, a clogged filter, poor pressure regulation, injectors that flow too little, or an air mass sensor that reads low at high airflow. CARB demands a fault once adaptive control has used up the adjustment the maker allows (13 CCR 1968.2 (e)(6.2.2)). No manufacturer publishes its criteria for P2191; GM covers the load range with P2177 and a factor of 1.23 instead, and Kia lists only the rich sibling P2192 for the Rio and Soul 1.6 GDI. Drivers may feel hesitation when accelerating hard.
- What you may notice
- Check engine light on
- Hesitation or flat spot under heavy throttle
- Loss of power when climbing or towing
- High positive long-term fuel trim at high load only
- Likely causes
- LikelyFuel pump or pressure regulation unable to hold pressure at high demand
- PossibleClogged fuel filter or strainer
- PossibleAir mass sensor under-reading at high airflow
- PossiblePartly blocked injectors on bank 1
- RareCharge-air or intake leak behind the air mass sensor (turbo engines)
- 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.