Error code

OBD2 P2190

OBD2P2190
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

System Too Rich at Idle.

Severity

moderateCan be driven but may experience poor performance and increased fuel consumption.

Summary

P2190 indicates that the engine's bank 2 is running too rich at idle, meaning there is an excess of fuel in the air-fuel mixture. This issue involves the adaptive heated oxygen sensor (H02S) signal being low or implausible.

Symptoms

  • Engine idling roughly
  • Poor acceleration

Common Causes

  • Faulty adaptive heated oxygen sensor (H02S)
  • Wiring issues, such as shorts to ground or positive
  • Fuel pressure regulator malfunction

Diagnosis

  1. Check the adaptive heated oxygen sensor (H02S) for proper operation.
  2. Inspect wiring connections to ensure no shorts or damage exist.
  3. Verify that the fuel pressure regulator is functioning correctly.

Fixes

  • Replace faulty adaptive heated oxygen sensor (H02S)

FAQ

What does P2190 mean?

P2190 indicates that the engine's bank 2 is running too rich at idle, meaning there is an excess of fuel in the air-fuel mixture.

How do I fix a system too rich at idle issue?

Fixing this issue typically involves replacing the faulty adaptive heated oxygen sensor (H02S) or addressing wiring issues and checking the fuel pressure regulator.

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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