P2196 – O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 1)

Description

The upstream oxygen sensor on Bank 1 is stuck indicating a rich condition. This causes incorrect fuel trim adjustments and may lead to poor fuel economy and rough running.

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Symptoms

Rough idle
Poor fuel economy
Black exhaust smoke
Hesitation
Check engine light

Causes

Faulty O2 sensor
Fuel pressure too high
Leaking injector
Wiring issues

Diagnosis

Check O2 sensor voltage
Inspect injectors
Monitor fuel pressure
Check wiring

Repair

Replace O2 sensor
Repair wiring
Replace leaking injector