Error code

OBD2 P0063

OBD2P0063
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

HO2S Heater Control Circuit Low.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0063 indicates a low voltage issue in the heater control circuit of the heated oxygen sensor (HO2S) 3 on bank 2.

Symptoms

  • Rich-running condition
  • Lean-running condition
  • Increased fuel consumption
  • Loss of power
  • Rough idling
  • Visible black smoke from tail pipe
  • Hard starting in some cases
  • Illuminated CHECK ENGINE light

Common Causes

  • Burnt wiring caused by proximity to hot exhaust components
  • Short circuits due to burnt wiring
  • Corrosion or impact damage on electrical connectors
  • Bad ground connections
  • Low battery voltage
  • Blown fuses in the heater control circuit

Diagnosis

  1. Perform a visual inspection of all associated wiring and connectors.
  2. Check for continuity and resistance in the heater control circuit.
  3. Inspect the oxygen sensor element for discoloration or deposits.
  4. Replace faulty wiring, connectors, or sensors as needed.

Fixes

  • Replace damaged wiring, connectors, or the oxygen sensor if necessary.

FAQ

What does P0063 mean?

P0063 indicates a low voltage issue in the heater control circuit of HO2S 3 on bank 2.

How do I diagnose P0063?

Diagnose by inspecting wiring, connectors, and oxygen sensor for issues like corrosion or damage.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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