P114C – Post-Catalyst Fuel Too Rich via Oxygen Sensor System, Bank 2

P114C Possible Causes

  • Exhaust system leak
  • Faulty pre-catalyst or post-catalyst oxygen sensor
  • Pre-catalyst or post-catalyst oxygen sensor harness is open or short-circuited
  • Poor electrical connection in the pre-catalyst or post-catalyst oxygen sensor circuit
  • Faulty Digital Motor Electronics (DME)

How is P114C Code Repaired?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P114C Meaning

The diagnostic function monitors the closed-loop lambda mixture control. The Engine Control Module (ECM) sets the OBDII code when the closed-loop lambda mixture does not meet factory specifications.

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P114C BMW – Post-Catalyst Fuel Too Rich via Oxygen Sensor System, Bank 2

P114C BMW Possible Causes

  • Exhaust system leak
  • Faulty pre-catalyst or post-catalyst oxygen sensor
  • Pre-catalyst or post-catalyst oxygen sensor wiring harness is open or short-circuited
  • Poor electrical connection in the pre-catalyst or post-catalyst oxygen sensor circuit
  • Faulty Digital Motor Electronics (DME)

How to Fix BMW P114C Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P114C BMW Meaning

The diagnostic function monitors the closed-loop lambda mixture control. The Engine Control Module (ECM) sets the OBDII code when the closed-loop lambda mixture does not meet factory specifications.

P114C MINI – Post-Catalyst Fuel Trim Too Rich Bank 2 Oxygen Sensor System

📌 Meaning of Code P114C

Code P114C indicates a malfunction in the air/fuel mixture regulation in the closed-loop lambda system.
The Engine Control Module (ECM) monitors this system to ensure the mixture meets factory specifications. If it does not, the code is triggered.

🚨 Possible Symptoms

  • Check Engine light or engine/service warning light illuminated
  • Potential increased fuel consumption
  • Higher pollutant emissions
  • Irregular engine operation (in some cases)

❗ Possible Causes

  • Exhaust system leak
  • Faulty oxygen sensor (pre-catalyst or post-catalyst)
  • Oxygen sensor wiring harness damaged (open or short circuit)
  • Faulty electrical connection in the oxygen sensor circuit
  • Defective DME (Digital Motor Electronics)

🛠️ How to Fix MINI Code P114C

  1. Start by checking the possible causes listed above.
  2. Visually inspect:
    • The oxygen sensor wiring harness
    • The connectors (look for broken, bent, pushed back, or corroded pins)
  3. Check for an exhaust leak before or around the lambda sensors.
  4. Test the oxygen sensor(s) using a diagnostic tool.
  5. If a DME failure is suspected, consult a professional with the appropriate equipment.

P114D – Post-Catalyst Fuel Trim via Lean Oxygen Sensor System, Bank 2

P114D Possible Causes

  • Exhaust system leak
  • Clogged catalytic converter
  • Faulty intake pressure sensors
  • Intake manifold pressure sensors are open or short-circuited
  • Intake circuit pressure sensors poor electrical connection
  • Faulty fuel injector

How is Code P114D Repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P114D Meaning

The diagnostic function monitors the closed-loop lambda mixture control. The Engine Control Module (ECM) sets the OBDII code when the closed-loop lambda mixture does not meet factory specifications.

P114D BMW – Post-Catalyst Fuel Trim System Too Lean Bank 2

BMW Code P114D: Causes, Diagnosis, and Solutions

Probable Causes

  • Exhaust system leak: A crack or faulty gasket can disrupt exhaust gas readings.
  • Clogged catalytic converter: Accumulation of deposits reduces the converter’s efficiency.
  • Intake pressure sensor failure:
    • Sensors with open circuit or short circuit.
    • Poor electrical contact in the intake harness.
  • Faulty fuel injector: A stuck injector or fuel leak disrupts the air-fuel mixture.

Common Symptoms

  • 🔧 Check engine light on (or warning message).
  • 🚗 Abnormal mixture richness (excessive fuel consumption, black exhaust smoke).
  • ⚠️ Reduced performance (loss of power, engine misfires).

Meaning of Code P114D
This code indicates a malfunction in the closed-loop lambda regulation system. The ECM (Engine Control Module) detects a discrepancy between measured values (from pressure sensors and the lambda sensor) and the reference ranges defined by the manufacturer. This can impact pollutant emissions and engine efficiency.

Diagnostic Procedure

  1. Visual inspection:
    • Check the exhaust system for leaks.
    • Inspect electrical connectors of intake sensors (corrosion, bent pins).
  2. Pressure sensor check:
    • Test sensor resistance and voltage with a multimeter.
    • Look for short circuits or breaks in the wiring harness.
  3. Catalytic converter diagnosis:
    • Measure exhaust backpressure (if clogged, replacement is necessary).
  4. Injector testing:
    • Check injector flow rate and sealing using a test bench.
  5. ECM data analysis:
    • Use a diagnostic tool to observe real-time values (intake pressure, lambda signal).

Repair Tips

  • Prefer replacing faulty sensors with genuine BMW parts.
  • Regularly clean electrical connectors with contact spray to prevent oxidation.
  • For a clogged catalytic converter, consider professional cleaning or replacement if necessary.

⚠️ Note: If the fault persists after these checks, consult a professional equipped with an advanced diagnostic tool (e.g., ISTA/D for BMW) for an in-depth analysis of engine parameters.

P114D MINI – Post-catalyst Fuel Trim via Oxygen Sensor System Too Lean, Bank 2

P114D MINI Possible Causes

  • Exhaust system leak
  • Clogged catalytic converter
  • Faulty intake pressure sensors
  • Intake manifold pressure sensors are open or short-circuited
  • Poor electrical connection of pressure sensors on the intake circuit
  • Faulty fuel injector

How to Fix MINI P114D Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins. What is the cost to diagnose the MINI P114D code

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P114D MINI Meaning

The diagnostic function monitors the closed-loop lambda mixture control. The Engine Control Module (ECM) sets the OBDII code when the closed-loop lambda mixture does not meet factory specifications.

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P1150 – Air/Fuel Ratio Sensor Circuit Malfunction / Range, Bank 2 Sensor 1

P1150 Possible Causes

  • Faulty air/fuel ratio (A/F), bank 2 sensor 1
  • Air-fuel ratio (A/F), bank 2 sensor 1 harness is open or shorted
  • Air-fuel ratio (A/F), bank 2 sensor 1 circuit, poor electrical connection
  • Fuel pressure
  • Fuel injector
  • Intake air leaks

How to Fix Code P1150?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1150 Meaning

The air-fuel ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. Based on the output voltage, the engine control module (ECM) determines whether the air-fuel ratio is RICH or LEAN and adjusts the stoichiometric air-fuel ratio. The ECM also checks the fuel injection volume compensation value to verify whether the A/F sensor is deteriorating or not. The deterioration of the A/F sensor response is determined by the ratio between the change in the A/F sensor output voltage and the fuel compensation change.

P1150 FORD F150 – Lack of Heated Oxygen Sensor Switch Upstream, Adaptive Fuel Limit, Row 2

P1150 FORD F150 Possible Causes

  • Oil overflow
  • Faulty oxygen sensor
  • High or low fuel pressure
  • Dirty/faulty MAF sensor
  • Engine vacuum leak
  • Leaking fuel injector or fuel pressure regulator
  • Faulty Powertrain Control Module (PCM)

How to Fix Code P1150 FORD F150?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

The HEGO sensor is monitored for switching. The test fails when the HO2S fails to switch due to a circuit or fuel at or exceeding a calibrated limit.

When is the Code Detected?

The Powertrain Control Module (PCM) could not adjust the fuel trim due to a lean or rich condition

Possible Symptoms

  • Check Engine Light on (or Engine Warning Light Soon)

P1150 FORD F150 Meaning

The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for any malfunction or deterioration that could affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). The downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. An input is required from the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT), Intake Air Temperature (IAT), Mass Air Flow (MAF), Throttle Position (TP), and Crankshaft Position (CKP) to activate the HO2S Monitor. The Fuel System Monitor and Misfire Detection Monitor must also have completed successfully before the HO2S Monitor is activated.
• The HO2S sensor detects the oxygen content in the exhaust stream and delivers a voltage between zero and 1.0 volt. At lean stoichiometry (air/fuel ratio of about 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. At rich stoichiometry, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S Monitor evaluates both the upstream (fuel control) and downstream (catalyst monitor) HO2S for proper operation.
• Once the HO2S Monitor is activated, the amplitude of the upstream HO2S signal voltage and the response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum threshold voltage that can be calibrated.
• A fixed-frequency closed-loop fuel control routine is executed, and the amplitude of the upstream HO2S voltage and the output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and
measuring the current through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.