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P142E Mercury Code - Exhaust Gas Recirculation Sensor 'D' Circuit High

Quick Answer

The P142E diagnostic trouble code (DTC) for Mercury vehicles indicates an issue with the Exhaust Gas Recirculation (EGR) Sensor 'D' Circuit being too high. Common causes include Faulty EGR Sensor: The most common cause of this code is a malfunctioning EGR Sensor 'D', which may need to be replaced, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the signal between the EGR sensor and the vehicle's computer, EGR Valve Problems: A faulty EGR valve can cause issues with the EGR system, leading to high voltage readings from the sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P142E Mercury indicates Exhaust Gas Recirculation Sensor 'D' Circuit High.
Common causes
Common causes include Faulty EGR Sensor: The most common cause of this code is a malfunctioning EGR Sensor 'D', which may need to be replaced, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the signal between the EGR sensor and the vehicle's computer, EGR Valve Problems: A faulty EGR valve can cause issues with the EGR system, leading to high voltage readings from the sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P142E Mercury Description

The P142E diagnostic trouble code (DTC) for Mercury vehicles indicates an issue with the Exhaust Gas Recirculation (EGR) Sensor 'D' Circuit being too high. The EGR system is an essential component in modern vehicles that helps reduce harmful emissions by recirculating a portion of exhaust gases back into the engine combustion chambers. The EGR sensor 'D' is responsible for monitoring the EGR system's operation and ensuring that it functions within the manufacturer's specified parameters.

OBDII Code P142E Mercury - Exhaust Gas Recirculation Sensor 'D' Circuit High
P142E Mercury Code - Exhaust Gas Recirculation Sensor 'D' Circuit High

Common Causes of P142E Mercury

  1. Faulty EGR Sensor: The most common cause of this code is a malfunctioning EGR Sensor 'D', which may need to be replaced.
  2. Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the signal between the EGR sensor and the vehicle's computer.
  3. EGR Valve Problems: A faulty EGR valve can cause issues with the EGR system, leading to high voltage readings from the sensor.
  4. Vacuum Leaks: Any vacuum leaks in the EGR system can result in improper operation and trigger this code.

Symptoms of P142E Mercury

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The engine may experience a reduction in power and overall performance, leading to sluggish acceleration and poor fuel efficiency.
  3. Rough Idle: The vehicle may exhibit rough idling or stalling when the EGR system is not functioning correctly.
  4. Increased Emissions: A malfunctioning EGR system can cause an increase in harmful emissions, potentially leading to a failed emissions test.

How to Fix P142E Mercury

  1. Diagnose the Issue: Use a diagnostic scan tool to retrieve the specific fault code and pinpoint the exact cause of the problem.
  2. Inspect EGR Sensor 'D': Check the EGR sensor 'D' for any signs of damage or wear. Replace the sensor if necessary.
  3. Check Wiring: Inspect the wiring harness for any damage, corrosion, or loose connections. Repair or replace any faulty wiring.
  4. Test EGR Valve: Test the EGR valve to ensure it is functioning correctly. Replace the valve if it is found to be faulty.
  5. Clear Codes: After completing the repairs, clear the fault codes from the vehicle's computer to reset the check engine light.

Cost to Fix P142E Mercury

The cost of repairing a P142E code on a Mercury vehicle can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of replacing an EGR sensor can range from $150 to $300, while fixing wiring issues or replacing the EGR valve may cost between $200 and $500. Labor rates at auto repair shops typically range from $80 to $150 per hour, so it's advisable to check with local shops for a more accurate estimate based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P142E Mercury Code

1. What does the OBDII code P142E mean for a Mercury vehicle?

P142E indicates that the Exhaust Gas Recirculation (EGR) Sensor 'D' Circuit is experiencing a high voltage issue, which may affect the EGR system's performance.

2. What are the common symptoms of the P142E code?

Symptoms may include the check engine light turning on, rough idling, reduced engine performance, increased emissions, and possible engine hesitation during acceleration.

3. What causes the P142E code to occur in a Mercury vehicle?

Common causes include a faulty EGR sensor, damaged or corroded wiring in the EGR circuit, a malfunctioning EGR valve, or a problem with the vehicle's powertrain control module (PCM).

4. Can I drive my Mercury with the P142E code?

While it may be possible to drive with this code, it is not recommended as it could lead to reduced fuel efficiency, higher emissions, and potential damage to the EGR system or engine.

5. How can I diagnose the P142E code on my Mercury?

Start by using an OBDII scanner to confirm the code. Then, inspect the EGR sensor, wiring, and connectors for damage or corrosion. Test the EGR sensor and valve with a multimeter to check for proper operation.

6. What repairs are commonly needed to fix the P142E code?

Repairs may include replacing the faulty EGR sensor, repairing or replacing damaged wiring or connectors, cleaning the EGR valve, or in rare cases, reprogramming or replacing the PCM.

7. How much does it cost to fix the P142E code on a Mercury vehicle?

The repair cost depends on the issue. EGR sensor replacement typically costs $150-$300, while wiring repairs or EGR valve cleaning may cost less. PCM replacement is more expensive, ranging from $500-$1,500.

8. Can a clogged EGR valve trigger the P142E code?

Yes, a clogged or malfunctioning EGR valve can lead to abnormal sensor readings and potentially trigger the P142E code.

9. How can I prevent the P142E code from reoccurring?

Regular maintenance, including cleaning the EGR valve and inspecting wiring and connectors for corrosion, can help prevent this code from reoccurring.

10. Will clearing the P142E code with an OBDII scanner fix the issue?

Clearing the code may temporarily remove the check engine light, but the underlying issue must be addressed to prevent the code from returning.

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