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P0169

Incorrect Fuel Composition

Fuel composition (e.g. ethanol fraction on flex-fuel vehicles) outside expected range. Wrong fuel filled or sensor fault.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: medium

Common causes

Ordered by how often each turns out to be the cause.

  • Wrong fuel filled (e.g. E85 in non-flex)Common

Parts involved

  • Flex Fuel Sensor

P0169 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.