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2019 FORD F-150
5.0L V8 Coyote•RWD•AUTOMATIC•gas
9 active safety recalls on this vehicle — view recalls
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Repairs420Labor1001Torque8720Fluid18DTC3818Battery2Maintenance0Recalls9
P2096moderate severityPowertrain

Post Catalyst Fuel Trim System Too Lean (Bank 1)

on 2019 Ford F-150 5.0L V8 Coyote · RWD

What this code means

The downstream oxygen sensor detects the exhaust running too lean after the catalytic converter. This usually points to unmetered air entering the system or a fuel delivery shortfall.

Symptoms

  • Check engine light on
  • Slight rough running or hesitation
  • Possible reduced fuel economy

Common causes

  • Exhaust leak upstream of rear O2 sensor
  • Vacuum or intake air leak
  • Faulty downstream oxygen sensor
  • Weak fuel pressure or delivery

Diagnostic steps

  1. Scan and confirm code with live fuel trim data
  2. Inspect exhaust for leaks near rear O2 sensor
  3. Check for intake vacuum leaks
  4. Test fuel pressure and O2 sensor operation
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