Code Definition

P1151 — Long term fuel trim 1 bank 1 below lean limit

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

About P1151

P1151 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1151 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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.

P1151 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

On Volkswagen and Audi engine management, long term fuel trim is learned across separate load ranges, with range 1 covering idle and low load operation. DTC P1151 is stored when the Bank 1 long term fuel trim in this lower range reaches its lean correction limit, meaning the Engine Control Module (ECM) has added the maximum fuel it is allowed in order to counter a mixture that runs too lean at low load. Because the lower range covers idle, an unmetered air leak after the air flow sensor is the most likely cause, though low fuel delivery can produce the same result. When this code is active the...

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