Error code

OBD2 P2626

OBD2P2626
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

O2 Sensor Pumping Current Trim Circuit/Open.

Severity

moderateCan drive, but performance issues may occur.

Summary

P2626 indicates an issue with the oxygen sensor's pumping current trim circuit, typically located at Bank 1 Sensor 1. This can affect the engine's ability to maintain optimal air-to-fuel ratios.

Symptoms

  • Illuminated CHECK ENGINE light
  • Increased fuel consumption
  • Rich or lean running condition
  • Black smoke from tailpipe
  • Loss of power
  • Hesitation upon acceleration

Common Causes

  • Defective oxygen sensor
  • Damaged wiring and connectors
  • Corroded connections
  • Excessive oil consumption
  • Aftermarket additives causing deposits on sensors

Diagnosis

  1. Record fault codes and freeze frame data.
  2. Inspect wiring for damage or corrosion.
  3. Check resistance, continuity, ground, and reference voltage of sensor wiring.
  4. Test the heater circuit input voltage.
  5. Replace faulty oxygen sensor if necessary.

Fixes

  • Replace defective oxygen sensor

FAQ

What causes P2626?

Common causes include a faulty oxygen sensor, damaged wiring and connectors, excessive oil consumption, or deposits from aftermarket additives.

How do I diagnose P2626?

Diagnose by inspecting wiring, checking electrical values, testing the heater circuit input voltage, and replacing the faulty oxygen sensor if necessary.

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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