What Does P014B Mean?
The O2 sensor on Bank 2, Sensor 2 (downstream of the catalytic converter) is showing a delayed response when transitioning from a lean exhaust condition to a rich condition. The sensor's voltage takes too long to rise from low to high when the exhaust shifts from lean to rich. This indicates the sensor element is degrading or contaminated and cannot accurately track rapid exhaust chemistry changes. Driveability symptoms are typically minimal.
Common Causes
45%
Worn or contaminated O2 sensor with degraded lean-to-rich response capability
20%
Catalytic converter issues affecting the exhaust gas composition at the downstream sensor
15%
Exhaust leak allowing fresh air to dilute the exhaust near the sensor
10%
Sensor wiring or connector issues causing signal delay or resistance
10%
Oil or coolant contamination on the sensor element from engine consumption issues
Diagnostic Steps
1
Monitor Bank 2 Sensor 2 voltage during a snap throttle test — the lean-to-rich transition should show voltage rising from below 0.2V to above 0.7V in under 100ms; a delayed sensor will take significantly longer.
2
Use a graphing function to overlay Bank 2 Sensor 1 and Sensor 2 waveforms — the downstream sensor should show dampened but timely responses to upstream changes.
3
Inspect the O2 sensor connector and wiring for heat damage, corrosion, or water intrusion that could add resistance to the signal circuit.
4
Check for engine oil consumption or coolant leaks that could contaminate the sensor — monitor coolant level and look for blue or white exhaust smoke.
5
If the sensor is suspect, measure its heater resistance (2-25 ohms typical) and confirm the heater is bringing the sensor to operating temperature quickly.
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The O2 sensor on Bank 2, Sensor 2 (downstream of the catalytic converter) is showing a delayed response when transitioning from a lean exhaust condition to a rich condition. The sensor's voltage takes too long to rise from low to high when the exhaust shifts from lean to rich. This indicates the sen...
The most common cause of P014B (O2 Sensor Delayed Response - Lean to Rich (Bank 2 Sensor 2)) is: Worn or contaminated O2 sensor with degraded lean-to-rich response capability
Typical repair costs for P014B range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. This is a downstream monitoring sensor and does not actively control fuel delivery. The check engine light will be on and the vehicle will not pass emissions testing, but there are no safety concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P014B to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions / Exhaust System
Difficulty
Type
Generic (SAE)
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