Code Definition

P1175 — Mixture 2 strength (multiplicative)

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Alfa Romeo

About P1175

P1175 is a manufacturer-specific powertrain diagnostic trouble code recorded for Alfa Romeo 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.

P1175 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

Bosch based engine management systems used by Alfa Romeo split long term fuel trim into two separate corrections. The additive correction is a fixed quantity applied mostly at idle and low load, while the multiplicative correction is a percentage factor applied proportionally across the whole airflow range. DTC P1175 is set when the multiplicative correction for mixture 2, meaning bank 2, drifts beyond the limit the ECM permits. Because the multiplicative term scales with airflow rather than acting as a fixed offset, this code points at faults whose effect grows with engine load, such as incor...

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