Error code

OBD2 P2197

OBD2P2197
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

O2 Sensor Signal Stuck Lean.

Severity

moderateCan be driven, but performance may suffer and fuel efficiency will likely decrease.

Summary

Code P2197 indicates that the heated oxygen sensor (HO2S) on bank 2 is sending an implausibly lean signal to the powertrain control module (PCM).

Symptoms

  • Lack of general engine performance
  • Diminished fuel efficiency
  • Service engine soon lamp illumination

Common Causes

  • Defective oxygen sensor
  • Burnt, broken, or disconnected wiring and/or connectors
  • Engine exhaust leaks
  • Large engine vacuum leak
  • Faulty mass air flow or manifold absolute pressure sensor
  • Faulty exhaust gas recirculation (EGR) valve

Diagnosis

  1. Visual inspection of system wiring harnesses and connectors
  2. Retrieve all stored trouble codes using a diagnostic scanner
  3. Monitor live data from the upstream O2 sensor with a digital volt ohmmeter (DVOM)
  4. Check voltage, ground signals, and resistance of the O2 sensor

Fixes

  • Replace faulty oxygen sensor or repair wiring/connectors as needed

FAQ

What does a stuck lean signal mean?

A stuck lean signal means the O2 sensor is indicating there's too little fuel in the exhaust, which can be caused by various issues like a faulty sensor or wiring problems.

How do I know if my oxygen sensor needs replacement?

If your vehicle has this code and symptoms persist after checking for other causes, it may indicate that the oxygen sensor is defective and needs to be replaced.

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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