Long term fuel trim 2, Bank 1 - above rich limit
VAG · fuel
Data confidence62%
The control module detected a fault associated with the Long term fuel trim 2, Bank 1 - above rich limit circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Audi.
Possible causes
Fuel pressure/pump
injectors
EVAP canister purge valve
EGR system
HO2S
intake/exhaust system
Applies toAudi
P1166
Long term fuel trim above rich limit
VAG · fuel
Data confidence80%
The control module detected a fault associated with the Long term fuel trim above rich limit circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Volkswagen.
Powertrain: engine, transmission and driveline systems.
1
Manufacturer-defined range: the meaning can differ between brands.
166
Specific fault index within the subsystem.
Frequently asked questions about P1166
What does P1166 mean?
Diagnostic Trouble Code (2 interpretations). The control module detected a fault associated with the Long term fuel trim 2, Bank 1 - above rich limit circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Audi.
Is P1166 generic or manufacturer-specific?
P1166 is a manufacturer-specific code. In this database it is documented for: VAG. The same number can mean something different on other brands.
Can TuningBot remove P1166 at file level?
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.
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