P2195 – O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 1)

Description

The upstream oxygen sensor on Bank 1 is stuck indicating a lean condition. This disrupts fuel trim calculations and can cause hesitation, rough idle, and poor drivability.

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Symptoms

Rough idle
Hesitation
Poor acceleration
High fuel trims
Check engine light

Causes

Faulty O2 sensor
Wiring damage
Exhaust leak
Contaminated sensor

Diagnosis

Check O2 sensor voltage
Inspect wiring
Check for exhaust leaks
Monitor fuel trims

Repair

Replace O2 sensor
Repair wiring
Fix exhaust leaks