P0102
Fix within a few daysMass Air Flow (MAF) Sensor Circuit Low Input
Code P0102 means your engine computer detects a low signal from the MAF sensor. Common causes: Faulty MAF sensor (70%), wiring issues (20%), clogged air filter (5%). Drivability: Yes, for short trips only. Repair cost: $50-$200 DIY, $150-$500 professional.
Can I Drive With P0102?
Yes, for short trips only
Essential trips under 10 miles, avoid highways and heavy acceleration
Stop driving immediately if: Flashing CEL, engine stalling, significant power loss, or strong fuel smell.
Symptoms of P0102
- 1Check Engine Light is on
- 2Rough idle or engine stalls
- 3Engine hesitation or stumbling during acceleration
- 4Reduced engine power
- 5Poor fuel economy
- 6Engine is hard to start
Common Causes of P0102
Parts most likely causing this code, ranked by probability
The MAF sensor's internal components fail, sending an incorrect low voltage signal to the engine computer.
70% of P0102 cases are fixed by replacing the MAF sensor
Damaged wires, corroded pins, or loose connections prevent the MAF sensor from sending an accurate voltage signal.
20% of P0102 cases are fixed by repairing MAF sensor wiring or connectors
A severely clogged air filter or obstruction before the MAF sensor restricts airflow, causing it to report low air volume.
5% of P0102 cases are fixed by addressing air intake obstructions
The engine computer itself fails to correctly interpret the MAF sensor's signal or has an internal fault in the MAF circuit.
5% of P0102 cases are fixed by replacing the engine control module
Check These First (Before Buying Parts)
- Visually inspect the MAF sensor connector for looseness or corrosion.
- Check the air filter for severe clogging or obstructions.
- Clean the MAF sensor with a dedicated MAF sensor cleaner.
How to Diagnose P0102
- 1Visually inspect the MAF sensor connector and wiring for damage, corrosion, or looseness.
- 2Check the air filter for severe clogging or obstructions.
- 3Clean the MAF sensor with a dedicated MAF sensor cleaner.
- 4Use a multimeter to test MAF sensor voltage output and continuity of its circuit wires.
- 5Use a scan tool to monitor MAF sensor readings (grams/second) at idle and during acceleration.
- 6If readings are consistently low or absent after cleaning and inspection, replace the MAF sensor.
P0102 on Popular Vehicles
Toyota Camry
2007-2024MAF sensor failures are a common cause of P0102 on these models, often due to age or contamination from aftermarket air filters. Cleaning the sensor can sometimes resolve it, but replacement is frequently necessary.
65% fixed by MAF Sensor replacement
Honda Accord
2003-2024P0102 on Accords often points to a faulty MAF sensor. Wiring issues are less common but should still be checked. Ensure the air filter is clean and properly seated.
70% fixed by MAF Sensor replacement
Ford F-150
2004-2024Ford F-150s can trigger P0102 due to MAF sensor failure, especially if the sensor gets contaminated by dirt or oil from aftermarket oiled air filters. Inspecting the intake tube for cracks is also important.
60% fixed by MAF Sensor replacement
Frequently Asked Questions
What does P0102 mean?
P0102 indicates the engine computer is receiving a lower-than-expected voltage signal from the Mass Air Flow (MAF) sensor, suggesting less air is entering the engine than it should.
Can I drive with P0102?
Yes, for short trips only. You will experience reduced engine performance and fuel economy. Avoid long distances or heavy acceleration to prevent further issues.
Will P0102 clear itself?
No, P0102 will not clear itself. The underlying issue causing the low MAF sensor input must be resolved before the code will clear.
How do I fix P0102 myself?
Start by inspecting the MAF sensor wiring and connector. Then, clean the MAF sensor with a dedicated MAF sensor cleaner. If the code returns, replace the MAF sensor.
How much does it cost to fix P0102?
DIY repair costs range from $50 (for MAF cleaner) to $200 (for a new MAF sensor). Professional repair costs typically range from $150 to $500, including diagnosis and parts.
P0102 keeps coming back - why?
The most common reasons for P0102 to return are a faulty MAF sensor that was not replaced, persistent wiring issues, or an underlying air intake restriction that was not fully resolved.
Will P0102 fail emissions/smog test?
Yes, P0102 will cause your vehicle to fail an emissions or smog test. The Check Engine Light indicates a fault in the emissions control system.
What's the difference between P0102 and P0101?
P0102 indicates a consistently low input signal from the MAF sensor, suggesting a circuit or sensor failure. P0101 indicates a MAF sensor performance issue, meaning the sensor's readings are inconsistent or outside the expected range for engine conditions, but not necessarily a constant low input.
P0102 on Honda Accord?
On Honda Accords, P0102 is frequently caused by a failing MAF sensor, especially on models with higher mileage. Inspecting the air filter and cleaning the MAF sensor are good first steps, but often a replacement MAF sensor is needed.
Questions to Ask Your Mechanic
Did you check the MAF sensor's live data readings at idle and under load?
Good answer: Yes, the MAF sensor was reading X grams/second at idle and Y grams/second at 2500 RPM, which is consistently below specification.
What did you find when inspecting the MAF sensor wiring and connector for corrosion or damage?
Good answer: I checked the wiring for continuity and resistance, and inspected the connector pins for corrosion. Everything looked good, so the issue is internal to the sensor.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$500
Save $100-$300 by doing it yourself
Difficulty
beginner
Time
0.5-1.5 hours
Beginner-friendly - Cleaning or replacing the MAF sensor is a simple task requiring basic tools and minimal mechanical experience.
Cost of Waiting
Ignoring P0102 leads to poor fuel economy, reduced engine power, and increased emissions. Prolonged rich or lean conditions can damage your catalytic converter, turning a $50-$200 MAF sensor replacement into a $1,200-$2,500 converter repair.
While You're In There...
A clean air filter is essential for MAF sensor accuracy and engine health. It is often accessed during MAF inspection or replacement.
Inspect for cracks or leaks around the MAF sensor housing or intake tube, as air leaks can cause incorrect readings and engine performance issues.
Tools You'll Need
- MAF sensor cleaner
- Screwdriver or socket set
- Multimeter (for advanced diagnosis)
- Scan tool (for advanced diagnosis)
P0102 is a common code related to your engine's air intake. Most repairs involve cleaning or replacing the MAF sensor, which is a straightforward fix that restores engine performance and fuel economy.
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Your Next Steps
Step 1: Visually inspect the MAF sensor wiring and connector for damage or corrosion. Check the air filter for severe clogging.
Step 2: If no obvious issues, clean the MAF sensor with a dedicated MAF sensor cleaner. Clear the code and test drive.
Step 3: If the code returns, use a scan tool to monitor MAF sensor readings. If readings are consistently low or absent, replace the MAF sensor.