P0102 on Toyota
Mass or Volume Air Flow Sensor Circuit Low Input
P0102 on Toyota vehicles indicates mass or volume air flow sensor circuit low input. Au7o has documented this code across 1 Toyota model — most commonly on Corolla. P0102 is a generic OBD-II code meaning the engine computer detected an abnormally low voltage or signal from the Mass Air Flow (MAF) sensor circuit. The MAF sensor measures how much air is entering the engine so the computer can deliver the correct amount of fuel. A low signal tells the computer it is reading less airflow than is actually present, which can cause poor running, stalling, or reduced power. While not usually an emergency, it can affect drivability and fuel economy and should be addressed. Typical repair costs on Toyota range from $40 to $350, depending on the specific model and root cause.
Common Causes of P0102
- •Dirty or contaminated MAF sensor element
- •Faulty MAF sensor
- •Damaged, corroded, or loose MAF connector/wiring
- •Open or short to ground in the signal or power circuit
- •Dirty or restricted air filter / intake blockage
- •Vacuum or intake air leak after the sensor
- •Poor power or ground supply to the sensor
P0102 on Toyota by Model
Toyota Corolla(1 issue)
- Dirty/Failed Mass Air Flow Sensor Causing P0171 Lean Code and Rough Idle2003-2010
The hot-wire mass air flow (MAF) sensor (PN 22204-22010, used across 2003-2008+ Toyotas) becomes contaminated with dust/oil film and under-reports airflow, so the ECM trims fuel lean and sets P0171 'System Too Lean (Bank 1)' and sometimes P0101/P0102. The result is rough or low idle, hesitation and a check engine light. A vacuum leak downstream of the MAF (PCV/intake) can produce the same lean code.
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View P0102 across all makes →Frequently Asked Questions
What does P0102 mean on Toyota?▼
P0102 stands for "Mass or Volume Air Flow Sensor Circuit Low Input." P0102 is a generic OBD-II code meaning the engine computer detected an abnormally low voltage or signal from the Mass Air Flow (MAF) sensor circuit. The MAF sensor measures how much air is entering the engine so the computer can deliver the correct amount of fuel. A low signal tells the computer it is reading less airflow than is actually present, which can cause poor running, stalling, or reduced power. While not usually an emergency, it can affect drivability and fuel economy and should be addressed. On Toyota specifically, this code is documented across 1 model.
What causes P0102 on Toyota vehicles?▼
Common causes on Toyota: Dirty or contaminated MAF sensor element, Faulty MAF sensor, Damaged, corroded, or loose MAF connector/wiring, Open or short to ground in the signal or power circuit, Dirty or restricted air filter / intake blockage. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0102 on a Toyota?▼
Repair costs on Toyota range from $40 to $350, depending on the specific model and root cause.
Which Toyota models have P0102 documented?▼
Au7o has documented P0102 on 1 Toyota model: Corolla.