Code Definition

P1165 — Long term fuel trim 1 bank 1 above rich limit

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Audi

About P1165

P1165 is a manufacturer-specific powertrain diagnostic trouble code recorded for Audi vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1165 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1165 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) uses the oxygen sensor upstream of the catalytic converter to trim fuel delivery and hold the mixture at stoichiometric. Short term fuel trim makes the immediate correction and long term fuel trim stores the learned average of that correction so the ECM can start from the right place. On these VAG applications the trim is split into ranges, and Range 1 refers to the additive correction learned in the idle and low load region. DTC P1165 is stored when the long term fuel trim for bank 1 in that range has moved to its maximum permitted limit in the lean commanding ...

Join TaT to view the complete code information and diagnostic details.

Quick Facts