P014B - OBD Trouble Code

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Improper fuel-air ratios can lead to loss of engine power, loss of acceleration and stalling as well as rough idle problems along with check engine light illuminating. This can be due to P014B error indicating problem with oxygen sensor.

OBD-II Code Decreased engine performance is defined as an O2 Sensor Delayed Response - Lean to Rich

OBD Code P014B is stored when the powertrain control module (PCM) detects a delayed response time from the downstream (or post catalytic converter) oxygen (O2) sensor or circuit for engine bank two. Bank 2 specifies the bank of the engine which does not contain the #1 cylinder.

The voltage signal from the O2 sensor is low when more oxygen is present in the exhaust (lean condition) and is higher when less oxygen is present in the exhaust (rich condition). The PCM uses this data to optimize fuel delivery and ignition timing strategy and to also monitor catalytic converter efficiency to keep a check on emissions.

What causes the problem of O2 Sensor Delayed Response - Lean to Rich (B2 S2)?

• Failure of Bank 2 Sensor 2
• O2 Sensor wiring open/short/damaged
• Open circuit inside Oxygen Sensor or open/ground wires to Bank 2 Sensor 2
• Corroded or Broken Exhaust System ground strap
• Rare ECU (Engine Control Unit) failure
• PCM/ECM or Oxygen Sensor Heater Circuit wiring failed

1. Powertrain Control Module - P014B error code also relates to problems with the powertrain which can store and flash wrong error code. Find all the Powertrain related parts with us.
2. Oxygen Sensor Cable - Faulty or damaged cables can cause the sensor to work inefficiently and thus can cause OBD code P014B to store in PCM
3. Exhaust Manifold - Faulty exhaust manifold causes loss of acceleration, power and fuel economy. Thus, replace them now!
4. Ambient Air Temperature Sensor - Faulty sensor can affect the fuel economy, and can cause engine overheating. Thus, replace faulty sensors now!
5. Catalytic Converter - Excessive amounts of unburned gas caused by a misfiring spark plug or a leaky exhaust valve can cause overheating of catalytic converter. Replace your old catalytic converter now!
6. Exhaust System - Replace faulty exhaust systems and parts as they can be a major reason for flashing of this error in the PCM.
7. Mass Air Flow Sensor - Faulty MAF sensor can cause symptoms similar to low fuel pressure as from a faulty fuel pump. Engine can become very hard to start and turn. Replace it now!
8. Throttle Position Sensor - Common signs of faulty TPS include rough engine idles and stalling with lack of acceleration and engine power. Replace faulty TPS immediately.
9. Diagnostic Tools - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.

OBD code P014B error means that an O2 sensor becomes slow or unresponsive for an extended period of time, it can be categorized as severe error.

Symptoms of this code may include:

Common Symptoms

• Affected fuel efficiency
• Lack of engine performance
• Check Engine Light illumination
• Engine stalling
• Reduced acceleration and power

• Oxygen Sensor Replacement
• Repair and replace short, damaged, and broken wirings
• Replacement of ECU (Engine Control Unit)
• Replacement of MAF sensor
• Replacement of Exhaust Manifold 

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• Take the help of a qualified technician to use a scan tool and confirm whether P014B is present.
• Find and freeze frame data with the code. Then, clear the code.
• Take the vehicle on a test drive under the same conditions.
• If the code reappears, perform a visual inspection of the bank 2 sensor 2 and its wiring. Also check the wiring on both oxygen sensors for damaged/broken wiring, swapped connectors, or wiring shorted to ground or power.
• If the wiring is okay, the sensor itself will be tested to confirm operation. Upstream O2 sensor data should fluctuate regularly between 1-millivolt (.100-volts) and 9-millivolts (.900-olts), if the engine is running efficiently. If voltage fluctuations are slower than expected, a P014B will be stored.
• If the O2 Sensor is functioning properly, the technician must check the Engine Control Unit for any faults and damages.

Common mistakes when diagnosing the P014B code

Always take professional help and follow the diagnosis instructions properly before coming to a conclusion or simply replacing the sensor first.

• Replacing PCM, without checking other components for faults
• Replacing Heated Oxygen Sensor directly
• Not inspecting faulty wiring and connections