P2191 code meaning
System Too Lean at Higher Load (Bank 1)
Powertrain system Generic code P21xx codes Check engine light
What P2191 means
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.
P2191 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2191
- 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
Common causes of P2191
- Most 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
- Less likelyCharge-air or intake leak behind the air mass sensor (turbo engines)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel pumpFuel filterFuel injectorMass air flow sensor
What each part of P2191 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 91 | The exact fault in that area. |
What to do next
- Note P2191 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2191
What does P2191 mean?
P2191 means "System Too Lean at Higher Load (Bank 1)". 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 a generic code, so it means the same on every make.
Is it safe to drive with P2191?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2191 fail an emissions test?
Yes, it can. P2191 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2191 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2191 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.