What this code means

The upstream heated oxygen sensor on Bank 2 is not switching and indicates a persistent rich condition. The sensor is stuck indicating a rich mixture on Bank 2.

Symptoms

• Check Engine Light
• Rich exhaust smell
• Black exhaust smoke
• Poor fuel economy
• Rough idle

Common causes

• Leaking fuel injector Bank 2
• High fuel pressure
• Faulty O2 sensor stuck rich
• EVAP purge issue
• Coolant entering combustion chamber Bank 2

Diagnostic steps

1. Monitor O2 sensor Bank 2 on scan tool
2. Check fuel pressure
3. Inspect spark plugs Bank 2 for fouling
4. Check for leaking injectors

Repair notes

Replace O2 sensor if stuck. Check fuel pressure regulator. Inspect injectors.

Other Powertrain codes on this vehicle