Error code

OBD2 P0165

OBD2P0165
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

O2 Sensor Circuit Slow OBDResponse.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0165 indicates a slow response from the heated oxygen sensor (HO2S) on bank 2, sensor 3, which is located downstream of the catalytic converter. This sensor monitors the efficiency of the catalytic converter.

Symptoms

  • Stored trouble code
  • Rich or lean running conditions
  • Reduced fuel economy
  • Engine hesitation or stumbling upon acceleration
  • Rough idling

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Open circuits
  • Blown fuses (where applicable)
  • Defective oxygen sensors
  • Heavily fouled or contaminated oxygen sensors

Diagnosis

  1. Check for other codes and ensure the engine is in perfect running condition.
  2. Inspect wiring and connectors for damage or corrosion.
  3. Monitor live data streams to check sensor temperature and signal voltage.
  4. Perform reference, input, resistance, ground, and continuity tests on wiring.
  5. Test oxygen sensor resistance and inspect for discoloration or deposits.

Fixes

  • Replace damaged wiring or connectors.
  • Replace faulty oxygen sensors.

FAQ

What does P0165 mean?

P0165 indicates a slow response from the heated oxygen sensor (HO2S) on bank 2, sensor 3.

How do I fix P0165?

Fixes include inspecting and replacing damaged wiring or connectors, testing and replacing faulty oxygen sensors 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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