Code Definition

P1161 — Fuel trim adaption additive Bank 2 high

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

About P1161

P1161 is a manufacturer-specific powertrain diagnostic trouble code recorded for BMW vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1161 is stored, the module has detected a signal or supply voltage higher 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.

P1161 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 BMW vehicles the Digital Motor Electronics (DME) uses additive fuel trim to correct small fuelling errors at idle and low load, where additive trim represents a fixed offset of fuel rather than a percentage. DTC P1161 sets when the long term additive fuel trim for Bank 2 exceeds its calibrated upper threshold, meaning the DME is adding significant fuel at idle to hold the commanded air fuel ratio. This points to a lean condition on Bank 2, most often from unmetered air entering after the mass air flow sensor, low fuel delivery, or a skewed oxygen sensor. Symptoms can include rough or unstab...

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