P2416 moderate

O2 Sensor Signal Biased/Stuck Rich - Bank 2 Sensor 2

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.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$150 - $800 (parts and labor)
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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

  1. Monitor bank 2 sensor 2 voltage with scan tool (should oscillate, not stay high)

  2. Compare upstream and downstream sensor readings for bank 2

  3. Check exhaust for leaks between the catalytic converter and sensor

  4. Inspect the sensor tip for contamination or deposits

  5. 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.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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