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Engine-Codes – Generic – P1428

P1428 Code - EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible

Quick Answer

The P1428 code indicates that there is a discrepancy between the readings of the EGR temperature sensor 1 and the intake air temperature sensor 2, suggesting that they are not providing consistent data to the engine control module. Common causes include Faulty EGR temperature sensor 1, Faulty intake air temperature sensor 2, Wiring or connector issues. 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
P1428 indicates EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible.
Common causes
Common causes include Faulty EGR temperature sensor 1, Faulty intake air temperature sensor 2, Wiring or connector issues.
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 06, 2024
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Code P1428 Description

The P1428 code indicates that there is a discrepancy between the readings of the EGR temperature sensor 1 and the intake air temperature sensor 2, suggesting that they are not providing consistent data to the engine control module. This can lead to improper fuel mixture ratios, affecting the engine's performance and emissions control. The EGR (Exhaust Gas Recirculation) system is responsible for recirculating a small amount of exhaust gas back into the intake manifold to reduce combustion temperatures and emissions. The intake air temperature sensor measures the temperature of incoming air to help the engine adjust fuel delivery for optimal performance. When these sensors provide conflicting information, it can lead to drivability issues and increased emissions.

OBDII Code P1428 - EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
P1428 Code - EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible

Common Causes of P1428

  1. Faulty EGR temperature sensor 1
  2. Faulty intake air temperature sensor 2
  3. Wiring or connector issues
  4. Vacuum leaks in the EGR system
  5. Carbon buildup in the EGR system

Symptoms of P1428

  1. Check Engine Light illuminated
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Poor acceleration
  5. Increased emissions

How to Fix P1428

  1. Diagnose the issue by using a scan tool to monitor the readings of both sensors
  2. Inspect the wiring and connectors for any damage or corrosion
  3. Test the sensors for proper operation and replace if necessary
  4. Clean out any carbon buildup in the EGR system
  5. Clear the trouble codes and perform a test drive to verify the repair

Cost to Fix P1428

The cost of repairing a P1428 code can vary depending on the specific cause of the issue. In general, replacing a faulty sensor or repairing wiring/connectors can cost between $100 to $300 for parts, with additional labor charges ranging from $100 to $200. However, prices can fluctuate depending on the location, vehicle make and model, and the shop's labor rates. It's recommended to obtain quotes from local auto repair shops for a more accurate estimate.

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Code P1428 Information for Specific Makes

  • P1428 Audi — Brake System Vacuum Pump Activation Short To Ground
  • P1428 Buick — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
  • P1428 Cadillac — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
  • P1428 Chevrolet — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
  • P1428 GMC — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
  • P1428 Volkswagen — Brake System Vacuum Pump Activation Short To Ground
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.

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