What Does P014E Mean?
The O2 sensor on Bank 2, Sensor 1 (upstream, pre-catalytic converter) is exhibiting a slow response when transitioning from a rich exhaust condition to a lean condition. This is the primary fuel control sensor for Bank 2, and its sluggish response means the PCM cannot accurately track and control the air-fuel ratio during transient driving conditions. The driver may notice reduced fuel economy, slightly rough acceleration, and potential emission test failure.
Common Causes
40%
Degraded or aging O2 sensor with slow rich-to-lean transition response
20%
Exhaust leak at the exhaust manifold or header on Bank 2
20%
Sensor element contamination from oil consumption, coolant leak, or fuel additives
10%
Wiring harness or connector damage in the sensor signal circuit
10%
Persistent rich condition on Bank 2 caused by leaking injector or fuel pressure issue
Diagnostic Steps
1
Monitor Bank 2 Sensor 1 O2 voltage waveform at 2500 RPM — the rich-to-lean voltage drop should cross 0.45V within 100ms; a slow sensor will take 300ms or more to complete the transition.
2
Compare Bank 2 STFT and LTFT to Bank 1 — trims significantly different between banks indicate the slow sensor is affecting fuel control accuracy.
3
Perform a fuel cut test by briefly decelerating from 3000 RPM with foot off the throttle — the sensor should drop to near 0V quickly; a slow drop confirms the fault.
4
Inspect the exhaust manifold on Bank 2 for cracks or leaks — look for carbon tracking or sooty discoloration around gasket surfaces and bolt holes.
5
Check for oil contamination by inspecting the sensor tip if accessible, and verify there are no oil consumption issues by monitoring oil level over 1000 miles.
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The O2 sensor on Bank 2, Sensor 1 (upstream, pre-catalytic converter) is exhibiting a slow response when transitioning from a rich exhaust condition to a lean condition. This is the primary fuel control sensor for Bank 2, and its sluggish response means the PCM cannot accurately track and control th...
The most common cause of P014E (O2 Sensor Slow Response - Rich to Lean (Bank 2 Sensor 1)) is: Degraded or aging O2 sensor with slow rich-to-lean transition response
Typical repair costs for P014E range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Drive with awareness. As an upstream sensor actively controlling fuel trim, a slow response can result in transient lean or rich conditions that stress the catalytic converter and may cause misfires under certain conditions. Repair in a timely manner.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P014E to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel System / Emissions
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
