What Does P014A Mean?
The O2 sensor on Bank 2, Sensor 2 (downstream of the catalytic converter) is exhibiting a delayed response when transitioning from a rich exhaust condition to a lean condition. The PCM has determined the sensor takes longer than the calibrated threshold to switch from high voltage to low voltage. This can mask catalytic converter efficiency issues and affect emissions accuracy. The driver may not notice driveability symptoms.
Common Causes
45%
Aging or contaminated O2 sensor with degraded platinum element response time
20%
Catalytic converter degradation causing abnormal exhaust gas chemistry at the sensor
15%
Exhaust leak between the catalytic converter and the sensor location
10%
Wiring harness degradation causing signal attenuation or high resistance
10%
Contamination from oil consumption, coolant leak, or fuel additive deposits on the sensor
Diagnostic Steps
1
Monitor Bank 2 Sensor 2 voltage waveform on live data — during a snap throttle test, the rich-to-lean transition should complete in under 100ms; delayed response will show a slow voltage drop from 0.8V+ to below 0.2V.
2
Compare the response time of Bank 2 Sensor 2 to Bank 1 Sensor 2 (if equipped) — both should have similar transition speeds.
3
Inspect the sensor tip for contamination — white deposits indicate coolant contamination, black soot indicates rich running, and a glazed appearance indicates oil contamination.
4
Check for exhaust leaks near the sensor using a smoke machine or by listening for ticking/hissing sounds at the exhaust joints.
5
Verify the catalytic converter is functioning properly by comparing upstream and downstream O2 sensor waveforms — the downstream sensor should show a relatively steady signal if the converter is working.
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 exhibiting a delayed response when transitioning from a rich exhaust condition to a lean condition. The PCM has determined the sensor takes longer than the calibrated threshold to switch from high voltage to low voltage. Th...
The most common cause of P014A (O2 Sensor Delayed Response - Rich to Lean (Bank 2 Sensor 2)) is: Aging or contaminated O2 sensor with degraded platinum element response time
Typical repair costs for P014A 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 downstream sensor monitors catalyst efficiency and does not directly control fuel trim. The vehicle will fail emissions testing but driveability should be unaffected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P014A 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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