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2006 FORD EXPLORER
4.6L V8•4WD•AUTOMATIC•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor987Torque6774Fluid18DTC2122Battery2Maintenance0Recalls4
P1152moderate severityPowertrain

Lack of HO2S Switch — Sensor Indicates Rich (Bank 2)

on 2006 Ford Explorer 4.6L V8 · 4WD

What this code means

The upstream heated oxygen sensor on Bank 2 is not switching and indicates a persistent rich condition. The sensor is stuck indicating a rich mixture on Bank 2.

Symptoms

  • Check Engine Light
  • Rich exhaust smell
  • Black exhaust smoke
  • Poor fuel economy
  • Rough idle

Common causes

  • Leaking fuel injector Bank 2
  • High fuel pressure
  • Faulty O2 sensor stuck rich
  • EVAP purge issue
  • Coolant entering combustion chamber Bank 2

Diagnostic steps

  1. Monitor O2 sensor Bank 2 on scan tool
  2. Check fuel pressure
  3. Inspect spark plugs Bank 2 for fouling
  4. Check for leaking injectors

Repair notes

Replace O2 sensor if stuck. Check fuel pressure regulator. Inspect injectors.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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