Code Definition

P1152 — Long term fuel trim 2 bank 1 below lean limit

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

About P1152

P1152 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 P1152 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.

P1152 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 2 covering the higher part load and load operation above idle. DTC P1152 is stored when the Bank 1 long term fuel trim in this upper range reaches its lean correction limit, meaning the Engine Control Module (ECM) has added the maximum fuel it is allowed to counter a mixture that runs too lean under load. Because the upper range is reached when the engine is breathing harder, a fuel delivery shortfall or an air flow signal that under reports are the most likely causes, although a la...

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