Check Engine Code

P2195

O2 Sensor Signal Stuck Lean (Bank 1, Sensor 1)

Severity: medium DIY difficulty: 2/5 Typical cost: $30–$500

What P2195 means

The upstream O2 sensor has reported a stuck-lean signal long enough to set a code — often an actual lean condition, not a sensor fault.

Symptoms

  • CEL
  • Rough running
  • Poor fuel economy

Likely causes (most common first)

  1. Vacuum leak
  2. Low fuel pressure
  3. Exhaust leak near the sensor
  4. Failed O2 sensor

Can I keep driving?

Medium — drivable but fix soon

Typical repair cost

DIY fixes can start near $30 (parts only). Shop repairs for P2195 typically run up to $500 depending on the underlying cause and vehicle. Start with the most common cause — Vacuum leak — before throwing parts at it.

Related codes

P0171P2196P2197

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