Guide To P014C OBD Error Code Solutions

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If you feel sudden drop in the engine performance and continuous stalling and hard idles along with flashing of check engine lights on the dashboard, this may be an indication of OBD Code P014C being stored in the PCM/ECM.

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

When PCM stores OBD code P014C, it means that the powertrain control module (PCM) has detected a delayed response time from the downstream (or post catalytic converter) oxygen (O2) sensor or circuit for engine bank two. Bank 1 specifies the bank of the engine which does not contain the #2 cylinder.

The voltage signal from oxygen sensor is higher when less oxygen is present in the exhaust (rich condition) and when more oxygen is present in the exhaust (lean condition), the voltage signal from the O2 sensor is low. This data is used by the PCM primarily to calculate fuel delivery and ignition timing strategy but also to monitor catalytic converter efficiency.

What causes the problem of O2 Sensor Slow Response - Rich to Lean (B1 S1)?

• Failed Bank 1 Sensor 1 O2 Sensor
• Short/open wiring problem
• High resistance and poor electrical connections
• ECU (Engine Control Unit) error

1. Powertrain Control Module - PCM issues directly affects the engine control and transmission control module. Thus, replace faulty components now.
2. Oxygen Sensor Cable - Check for faulty sensor cables that will not be able to transmit the data properly and needs to be replaced immediately.
3. Exhaust Manifold - Faulty exhaust manifold causes increased engine noises, loss of acceleration, power and fuel economy. Repair or replace as necessary.
4. Ambient Air Temperature Sensor - This sensor can help to manage the fuel delivery system and the engine performance. Thus, replace and repair, if found faulty.
5. Catalytic Converter - Sometimes catalytic converters can overheat and become faulty. Replace your old catalytic converter now!
6. Exhaust System - Replace damaged exhaust parts immediately as a damaged one hampers the fuel economy and thus the performance.
7. Mass Air Flow Sensor - Faulty MAF sensor can cause engine to run rich or lean under load, decrease fuel efficiency and because rough engine idles. Thus, replace them now!
8. Throttle Position Sensor - TPS helps to maintain the fuel to air ratios and thus hampers the engine performance. Replace it now!
9. Diagnostic Tools - Find wide range of diagnostic tools to detect and correct the OBD code error.

Symptoms of this code may include:

Common Symptoms

• Reduced fuel efficiency
• Affected engine performance and acceleration
• Rough starts and engine idle
• Malfunction Indicator Light (MIL) illumination

• Replace Bank 1 sensor 1 oxygen sensor
• Repair/replace open or short in the wiring and connections
• Bank 1 Sensor 1 fuse replacement
• Replacement of PCM/ECM 

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• Install a scan tool in vehicles OBD-II port to check if P014C is present or not.
• Freeze frame data and test drive to check if the code reappears under same conditions.
• If the Check Engine Light returns upon test, then the code is confirmed.
• Search technical service bulletins (TSB) in your vehicle information source. If you find one that matches the symptoms and code/s presented by the vehicle in question, it will very likely aid you in your diagnosis. TSB listings are compiled from thousands of successful repairs.
• Performs a visual inspection of wiring and bank 1 sensor 1 for any damage, breaks, or shorted wiring.
• 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 P014C will be stored.
• Check for the voltage of Bank 1 sensor 1 and make sure it is not excessively low. If low voltage is confirmed, bank 1 sensor 1 is faulty.
• A diagnostic of the ECU (Engine Control Unit) will be performed, if the voltage is not low and sensors are fine.

Common mistakes when diagnosing the P014C code

P014C is an uncommon code and following all diagnostic steps is important so nothing is overlooked. Oxygen sensors should be properly examined and replaced, if faulty. Always confirm low voltage for oxygen sensor bank 1 sensor 1 before any replacement is performed and avoid going to the ECU straightaway.