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P2066

Fuel Level Sensor B Performance

Secondary fuel-level sensor B reads within range but plausibility check fails — value sticks, jumps, or does not match consumption.

  • Check engine light: Not always
  • Emissions related: No
  • Repair difficulty: hard

Common causes

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

  • Float arm sticksCommon

Parts involved

  • Fuel Level Sensor B

P2066 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.