AutoCodes – Mercury – P142D Mercury

P142D Mercury Code - Exhaust Gas Recirculation Sensor 'D' Circuit Low

Quick Answer

The Powertrain Control Module (PCM) monitors the Exhaust Gas Recirculation Sensor 'D'. Common causes include Faulty Exhaust Gas Recirculation Sensor 'D', Exhaust Gas Recirculation Sensor 'D' harness is open or shorted, Exhaust Gas Recirculation Sensor 'D' circuit poor electrical connection. 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: P142D Mercury indicates Exhaust Gas Recirculation Sensor 'D' Circuit Low.
Common causes: Common causes include Faulty Exhaust Gas Recirculation Sensor 'D', Exhaust Gas Recirculation Sensor 'D' harness is open or shorted, Exhaust Gas Recirculation Sensor 'D' circuit poor electrical connection.
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.

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Code Popularity 1,334

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P142D Mercury Description

The Powertrain Control Module (PCM) monitors the Exhaust Gas Recirculation Sensor 'D'. The PCM sets the OBDII code when the Exhaust Gas Recirculation Sensor 'D' is not to factory specifications.

OBDII Code P142D Mercury - Exhaust Gas Recirculation Sensor 'D' Circuit Low - AutoCodes.com — P142D Mercury Code - Exhaust Gas Recirculation Sensor 'D' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P142D Mercury?

Faulty Exhaust Gas Recirculation Sensor 'D'
Exhaust Gas Recirculation Sensor 'D' harness is open or shorted
Exhaust Gas Recirculation Sensor 'D' circuit poor electrical connection

How to Fix the DTC P142D Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P142D Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P142D Mercury Code

What does the OBDII code P142D mean?

The OBDII code P142D indicates a low signal in the Exhaust Gas Recirculation (EGR) Sensor 'D' circuit, which can affect the vehicle's emissions control system.

What are the common symptoms of a P142D code?

Common symptoms include poor engine performance, increased fuel consumption, rough idling, and the Check Engine Light being illuminated.

What can cause the P142D code to trigger?

Causes can include a faulty EGR sensor, wiring issues such as shorts or breaks in the circuit, a clogged EGR valve, or issues with the engine control module (ECM).

How can I diagnose a P142D code?

To diagnose a P142D code, check the EGR sensor and circuit for damage, test the sensor's voltage and ground, and inspect the EGR valve for blockages or malfunctions.

What are some common repairs for a P142D code?

Common repairs may involve replacing the EGR sensor, repairing or replacing damaged wiring, cleaning or replacing the EGR valve, or reprogramming the ECM if necessary.

Can I drive my car with a P142D code?

While it may be possible to drive the vehicle, it's not recommended as it can lead to increased emissions, reduced fuel efficiency, and potential engine damage over time.

How can I clear the P142D code after repairs?

Once repairs are made, you can clear the code using an OBDII scanner, or by disconnecting the vehicle's battery for a few minutes. However, the problem must be resolved to prevent the code from reappearing.

Is the P142D code serious?

Yes, the P142D code is considered serious as it relates to the vehicle's emissions system and can negatively impact engine performance and fuel efficiency.

What should I do if the P142D code keeps coming back?

If the P142D code keeps returning, further diagnosis is needed to identify any underlying issues, such as persistent wiring problems, sensor faults, or ECM issues that may require professional attention.