P0102

Q: What does OBD2 code P0102 mean?

P0102 means: Mass Air Flow Circuit Low Input. MAF sensor signal voltage is lower than expected. The ECM thinks less air is entering than actually is.

Mass Air Flow Circuit Low Input

MAF sensor signal voltage is lower than expected. The ECM thinks less air is entering than actually is.

SeverityModerate

CategoryEngine

Est. Repair Cost$50–$300

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Dirty MAF sensor
›Short to ground in MAF wiring
›Faulty MAF sensor
›Air leak after MAF

⚠️ Symptoms

›Rich running condition
›Black smoke
›Poor fuel economy
›Sluggish acceleration

✅ How to Fix — Step by Step

Step 1:Clean MAF sensor
Step 2:Check wiring for short to ground
Step 3:Replace MAF sensor
Step 4:Check for air leaks

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Fuel Pressure Gauge
✔Compression Tester
✔Spark Tester

Using the correct diagnostic tools helps identify the root cause of P0102 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Low MAF signal often causes rich mixture — look for black smoke as confirmation.

Repair Cost Estimate

Full Repair Estimate

$50–$300

DIY Possible?

YES

Severity

Moderate

Frequently Asked Questions

What does OBD2 code P0102 mean?+

P0102 stands for Mass Air Flow Circuit Low Input. MAF sensor signal voltage is lower than expected. The ECM thinks less air is entering than actually is.

What causes code P0102?+

Dirty MAF sensor; Short to ground in MAF wiring; Faulty MAF sensor; Air leak after MAF

How do I fix code P0102?+

Clean MAF sensor; Check wiring for short to ground; Replace MAF sensor; Check for air leaks

How much does it cost to fix P0102?+

Estimated repair cost for P0102 is $50–$300.

Is P0102 DIY-friendly?+

Yes — P0102 is generally DIY-friendly with basic tools.