O2 Sensor Signal Biased/Stuck Rich - Bank 2 Sensor 2
What does P2416 mean?
The P2416 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Signal Biased/Stuck Rich - Bank 2 Sensor 2. This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Poor fuel economy
- Failed emissions inspection
- Strong fuel smell from exhaust
- Black residue on tailpipe
Probable Causes (Ranked by Likelihood)
- Failing downstream oxygen sensor on bank 2 Very High
- Catalytic converter on bank 2 not functioning High
- Fuel contamination on the O2 sensor element Moderate
- Exhaust leak before the sensor Moderate
Step-by-Step Diagnostic Procedure
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Monitor bank 2 sensor 2 voltage with scan tool (should oscillate, not stay high)
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Compare upstream and downstream sensor readings for bank 2
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Check exhaust for leaks between the catalytic converter and sensor
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Inspect the sensor tip for contamination or deposits
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Evaluate catalytic converter efficiency with a scan tool
Frequently Asked Questions
Can I drive with code P2416?
Short distances are acceptable. The engine may run richer than normal, reducing fuel economy and potentially damaging the catalytic converter.
What causes P2416?
Usually a failing downstream O2 sensor that is stuck reading rich. A degraded catalytic converter can also cause the sensor to read abnormally.
Is P2416 expensive to fix?
Costs range from $150 for sensor replacement to $800 if the catalytic converter also needs replacement. Start with the sensor.