TuningBot DTC Database · v4.37.15
Manufacturer-specific interpretation for MINI. All interpretations of P1091
The control module detected that the air-fuel mixture stayed richer than the target despite full corrective control (Pre - Catalyst Fuel Trim). This is the manufacturer-specific definition used by MINI.
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Pre - Catalyst Fuel Trim Too Rich Bank 1. The control module detected that the air-fuel mixture stayed richer than the target despite full corrective control (Pre - Catalyst Fuel Trim). This is the manufacturer-specific definition used by MINI.
P1091 is a manufacturer-specific code. In this database it is documented for: MINI. The same number can mean something different on other brands.
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Understand the system behind this code: Oxygen Sensors (Lambda)
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