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P2042 Ford Code - Reductant Temperature Sensor Circuit

Quick Answer

The P2042 Ford diagnostic trouble code (DTC) specifically refers to the reductant temperature sensor circuit. Common causes include Faulty reductant temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor or circuit. 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
P2042 Ford indicates Reductant Temperature Sensor Circuit.
Common causes
Common causes include Faulty reductant temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor or circuit.
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 08, 2024
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Code P2042 Ford Description

The P2042 Ford diagnostic trouble code (DTC) specifically refers to the reductant temperature sensor circuit. In modern diesel vehicles equipped with selective catalytic reduction (SCR) systems, the reductant temperature sensor plays a crucial role in monitoring the temperature of the diesel exhaust fluid (DEF) or urea solution before it enters the SCR catalyst. This sensor ensures that the DEF is at the optimal temperature for the SCR system to effectively reduce harmful nitrogen oxides (NOx) emissions into harmless nitrogen and water vapor.

OBDII Code P2042 Ford - Reductant Temperature Sensor Circuit
P2042 Ford Code - Reductant Temperature Sensor Circuit

Common Causes of P2042 Ford

  1. Faulty reductant temperature sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or contamination in the sensor or circuit
  4. ECM software or hardware issues
  5. Exhaust leaks affecting sensor readings

Symptoms of P2042 Ford

  1. Illuminated check engine light on the dashboard
  2. Decreased fuel efficiency
  3. Reduced engine power or acceleration
  4. Increased emissions output
  5. Difficulty passing emissions tests

How to Fix P2042 Ford

  1. Use a diagnostic scanner to retrieve the specific trouble code and confirm the issue.
  2. Inspect the reductant temperature sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor's resistance and voltage to determine if it is functioning within specifications.
  4. Replace the reductant temperature sensor if it is found to be faulty.
  5. Clear the DTC and test drive the vehicle to ensure the code does not return.

Cost to Fix P2042 Ford

The typical repair costs for addressing a P2042 Ford code can range from $150 to $400, including parts and labor. However, the exact cost can vary depending on the location, vehicle make and model, and the specific repair shop rates. It's recommended to contact local auto repair shops for more accurate pricing information. Keep in mind that diagnosis time and labor rates can impact the total repair costs.

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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 P2042 Ford Code

1. What are the common symptoms of OBDII code P2042 in a Ford vehicle?

The common symptoms of OBDII code P2042 in a Ford vehicle include the malfunction indicator light (MIL) turning on, reduced engine performance, and potential issues with the exhaust system.

2. What does the OBDII code P2042 indicate in a Ford vehicle?

OBDII code P2042 in a Ford vehicle indicates a problem with the Reductant Temperature Sensor Circuit, specifically related to the reductant (DEF or AdBlue) system.

3. What are the possible causes of OBDII code P2042 in a Ford vehicle?

Possible causes of OBDII code P2042 in a Ford vehicle include a faulty reductant temperature sensor, damaged wiring or connectors in the sensor circuit, issues with the reductant heater, or a malfunctioning powertrain control module (PCM).

4. How can I diagnose the OBDII code P2042 in my Ford vehicle?

Diagnosing OBDII code P2042 in a Ford vehicle typically involves using a diagnostic scan tool to retrieve the specific fault code, checking the reductant temperature sensor and its circuit for any visible damage, and testing the sensor's resistance and voltage readings.

5. Can I continue driving my Ford vehicle with OBDII code P2042?

It is not recommended to continue driving your Ford vehicle with OBDII code P2042, as it can lead to reduced engine performance and potential damage to the reductant system components. It's best to address the issue promptly.

6. How can I repair OBDII code P2042 in my Ford vehicle?

Repairing OBDII code P2042 in a Ford vehicle may involve replacing the faulty reductant temperature sensor, repairing or replacing damaged wiring or connectors, addressing issues with the reductant heater, or reprogramming the PCM if necessary.

7. Is OBDII code P2042 a common issue in Ford vehicles?

OBDII code P2042 related to the Reductant Temperature Sensor Circuit is not extremely common in Ford vehicles, but it can occur due to sensor or system malfunctions. Regular maintenance and proper care of the reductant system can help prevent this issue.

8. Can I reset the OBDII code P2042 in my Ford vehicle on my own?

While you can clear the OBDII code P2042 using a diagnostic scan tool, it's important to address the underlying issue causing the fault code to prevent it from recurring. Clearing the code without fixing the problem may lead to further complications.

9. How much does it cost to repair OBDII code P2042 in a Ford vehicle?

The cost to repair OBDII code P2042 in a Ford vehicle can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs. It's recommended to consult a professional mechanic for an accurate estimate.

10. Can a DIY enthusiast fix OBDII code P2042 in a Ford vehicle?

While some DIY enthusiasts may be able to diagnose and repair OBDII code P2042 in a Ford vehicle, it's a complex issue related to the reductant system. It's advisable to have the expertise and tools required for working on such components to ensure proper repair and avoid further damage.

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