AutoCodes – Mercury – P0104 Mercury

P0104 Mercury Code - Mass or Volume Air Flow 'A' Circuit Intermittent

Quick Answer

The Mass Air Flow (MAF) sensor is placed in the stream of the intake air. Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, Intake air leaks. 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: P0104 Mercury indicates Mass or Volume Air Flow 'A' Circuit Intermittent.
Common causes: Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, Intake air leaks.
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 1,202

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 19, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0104 Mercury Description

The Mass Air Flow (MAF) sensor is placed in the stream of the intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM). The ECM controls the temperature of the hot film by a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change. The Diagnostic Trouble Code (DTC) will be set when the ECM detects an MAF Sensor signal that is outside the calibrated level.

OBDII Code P0104 Mercury - Mass or Volume Air Flow 'A' Circuit Intermittent - AutoCodes.com — P0104 Mercury Code - Mass or Volume Air Flow 'A' Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0104 Mercury?

Dirty Air Filter
Dirty Mass Air Flow (MAF) Sensor
Intake air leaks
Faulty Mass Air Flow Sensor
Mass Air Flow Sensor harness is open or shorted
Mass Air Flow Sensor circuit poor electrical connection

How to Fix the DTC P0104 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 does this mean?

Code Tech Notes

Before replacing the Mass Air Flow (MAF) Sensor, try replacing the air filter and cleaning the Mass Air Flow Sensor with low compress air or Mass Air Flow Sensor Cleaner. Reset code and drive vehicle. If the code comes back, you must replace the Mass Air Flow Sensor to fix the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0104 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 P0104 Mercury Code

1. What are the common symptoms of OBDII code P0104 in a Mercury vehicle?

- Common symptoms include rough idling, stalling, decreased fuel efficiency, hesitation during acceleration, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0104 in a Mercury vehicle?

- The code P0104 usually indicates an intermittent issue with the Mass Air Flow (MAF) sensor, such as a faulty sensor, damaged wiring, a poor connection, or a vacuum leak.

3. How can I diagnose the OBDII code P0104 in my Mercury vehicle?

- To diagnose the code P0104, you can start by visually inspecting the MAF sensor and its wiring for any visible damage. Using a multimeter, you can also test the sensor's voltage and resistance to determine if it is functioning correctly.

4. Can I drive my Mercury with OBDII code P0104?

- It is not recommended to drive your Mercury with an unresolved P0104 code, as it can lead to further damage to the engine and negatively impact performance and fuel efficiency.

5. How can I repair OBDII code P0104 in my Mercury vehicle?

- Repairing the P0104 code may involve replacing the MAF sensor, repairing or replacing damaged wiring, ensuring proper sensor connection, and addressing any vacuum leaks in the intake system.

6. Are there any DIY tips for resolving OBDII code P0104 in a Mercury?

- DIY tips include cleaning the MAF sensor using specialized cleaner, checking and securing all sensor connections, and inspecting the intake system for any leaks or blockages.

7. How much does it cost to repair OBDII code P0104 in a Mercury vehicle?

- The cost of repairing the P0104 code in a Mercury can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

8. Can a faulty air filter cause OBDII code P0104 in a Mercury?

- While a dirty or clogged air filter can affect the MAF sensor's readings, it is not a direct cause of the P0104 code. It is still important to regularly replace the air filter as part of routine maintenance.

9. Will resetting the Check Engine Light resolve OBDII code P0104 in a Mercury?

- Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing the P0104 code is not addressed, the light is likely to come back on once the problem reoccurs.

10. How often should the MAF sensor be inspected in a Mercury to prevent OBDII code P0104?

- It is recommended to inspect the MAF sensor during routine maintenance intervals or whenever you experience symptoms associated with a faulty sensor. Regular inspections can help prevent the occurrence of the P0104 code.