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P142A Buick Code - EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible

Quick Answer

The P142A code indicates a discrepancy between the readings from the EGR (Exhaust Gas Recirculation) temperature sensor 2 and the intake air temperature sensor 2. Common causes include Faulty EGR Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings, Defective Intake Air Temperature Sensor: Similar to the EGR sensor, the intake air temperature sensor may be faulty, Wiring Issues: Damaged or corroded wiring or connectors between the sensors and the ECM can lead to erroneous readings. 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
P142A Buick indicates EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible.
Common causes
Common causes include Faulty EGR Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings, Defective Intake Air Temperature Sensor: Similar to the EGR sensor, the intake air temperature sensor may be faulty, Wiring Issues: Damaged or corroded wiring or connectors between the sensors and the ECM can lead to erroneous readings.
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 Oct 21, 2024
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Code P142A Buick Description

The P142A code indicates a discrepancy between the readings from the EGR (Exhaust Gas Recirculation) temperature sensor 2 and the intake air temperature sensor 2. This code is specific to certain Buick models and signifies that the Engine Control Module (ECM) has detected that the temperatures reported by these sensors are not consistent with each other, leading to a "not plausible" condition.

OBDII Code P142A Buick - EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible
P142A Buick Code - EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible

Common Causes of P142A Buick

  1. Faulty EGR Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings.
  2. Defective Intake Air Temperature Sensor: Similar to the EGR sensor, the intake air temperature sensor may be faulty.
  3. Wiring Issues: Damaged or corroded wiring or connectors between the sensors and the ECM can lead to erroneous readings.
  4. EGR Valve Malfunction: A stuck or malfunctioning EGR valve may cause abnormal temperature readings.
  5. Vacuum Leaks: Leaks in the intake system can affect the air-fuel mixture and lead to sensor discrepancies.

Symptoms of P142A Buick

  1. Check Engine Light: The most immediate symptom is the illumination of the check engine light on the dashboard.
  2. Poor Fuel Economy: Drivers may notice a decline in fuel efficiency due to improper air-fuel mixture and combustion conditions.
  3. Rough Idling: The engine may exhibit rough idling or stalling, particularly at low RPMs.
  4. Increased Emissions: The vehicle may fail emissions tests due to elevated NOx levels.
  5. Loss of Power: There could be a noticeable decrease in engine power and acceleration, especially during heavy acceleration.

How to Fix P142A Buick

  1. Diagnostic Scan: Begin with a thorough diagnostic scan to confirm the P142A code and check for any additional codes that may provide more context.
  2. Visual Inspection: Inspect the wiring and connectors associated with the EGR and intake air temperature sensors for any signs of damage or corrosion.
  3. Sensor Testing: Test the EGR temperature sensor and intake air temperature sensor using a multimeter to verify their functionality.
  4. Replace Faulty Components: If any sensors are found to be defective, replace them with OEM or high-quality aftermarket parts.
  5. Clear Codes and Test Drive: After repairs, clear the diagnostic codes and perform a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix P142A Buick

The cost to repair the P142A code can vary significantly based on the specific diagnosis and repairs needed. Generally, the cost for parts (sensors, wiring, etc.) can range from $50 to $200. Labor costs typically range from $80 to $150 per hour, depending on the shop's location and expertise. Given that diagnosing and repairing this issue may take 1 to 3 hours, the total cost could range from $130 to $600. It's important to note that labor rates can vary widely; metropolitan areas and dealerships may charge higher rates, while independent shops may offer more competitive pricing. Always check local rates for a more precise estimate tailored to your specific situation.

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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 P142A Buick Code

1. What are the common symptoms of OBDII code P142A in a Buick related to the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- Common symptoms include engine misfires, rough idle, decreased fuel efficiency, and potentially a Check Engine light.

2. What are some possible causes of OBDII code P142A in a Buick indicating an issue with the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- Causes can include a faulty EGR temperature sensor, issues with the intake air temperature sensor, wiring/connectivity problems, or a faulty ECM.

3. How can I diagnose the OBDII code P142A in my Buick related to the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, followed by inspecting the sensors, wiring, and connections for any visible damage or issues.

4. Is it safe to continue driving my Buick with the OBDII code P142A related to the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- It is not recommended to drive the vehicle with this code as it can lead to poor engine performance and potentially cause further damage if left unresolved.

5. What are some repair tips for fixing OBDII code P142A in a Buick indicating an issue with the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- Repair tips may include replacing the faulty sensors, checking and repairing any damaged wiring, ensuring proper connectivity, and clearing the code after repairs.

6. Can I reset the OBDII code P142A in my Buick related to the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible myself?

- You can attempt to reset the code using an OBDII scanner, but it is important to address the underlying issue causing the code to prevent it from recurring.

7. How much does it typically cost to repair OBDII code P142A in a Buick associated with the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve sensor replacement, wiring repairs, or ECM diagnostics, potentially ranging from $100 to $500 or more.

8. Are there any preventative measures I can take to avoid OBDII code P142A in my Buick related to the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- Regular maintenance, such as checking and cleaning sensors, inspecting wiring, and addressing any issues promptly, can help prevent the occurrence of this code.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P142A in a Buick indicating an issue with the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible?

- Depending on the exact cause, a DIY enthusiast may be able to address this code by replacing sensors or repairing wiring, but complex issues may require professional assistance.

10. Will ignoring OBDII code P142A in my Buick related to the EGR Temperature Sensor 2 Intake Air Temperature 2 Not Plausible lead to more severe problems?

- Ignoring this code can lead to poor engine performance, decreased fuel efficiency, and potentially more severe issues over time, so it is best to address it promptly.

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