Code Definition

P1137 — Long Term Fuel Trim Add. Fuel B1 System Too Rich

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

About P1137

P1137 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.

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.

P1137 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, fuel trim adaptation is divided into a multiplicative correction that scales with engine load and an additive correction that mainly affects idle and low load operation. DTC P1137 relates to the Bank 1 additive fuel adaptation and is stored when this correction reaches its rich limit because the ECM has had to remove a fixed quantity of fuel to counter a mixture that runs too rich at idle. Because the additive value corrects the idle region, the usual causes are extra fuel reaching the engine at low load, such as a leaking injector or evaporative vapou...

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