Gumout Professional Formula Mass Air Flow Sensor Cleaner
Priced as of May 16, 2026
4.7(729 ratings)Subscribe & Save: $11.39 (5% off)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
As an Amazon Associate and affiliate partner, CarCareTruth earns from qualifying purchases. Full disclosure
Prices may varyFrom the Safety Data Sheet
Full SDS ↗ (rev. 2023-01-12)GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
EyesSituationalMfr. SDS §8SkinSituationalMfr. SDS §8 · 29 CFR 1910.138(a) · GHS H315LungsRecommendedMfr. SDS §8 · 29 CFR 1910.134 · GHS H373Ventilation—No PPE in published sourcesShow details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §2 does not list H319 (eye irritation) at the mixture level — the primary eye exposure risk is from aerosol mist drift at close range during sensor spraying rather than direct chemical irritation. Aerosol form factor warrants situational eye protection.”
— Gumout
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §2 lists H315 (skin irritation Cat 2). Light aliphatic hydrocarbons cause skin irritation on prolonged or repeated contact; brief incidental contact during short MAF cleaning sessions is the realistic exposure scenario.”
— Gumout
U.S. regulatory standard
29 CFR 1910.138(a)
“appropriate hand protection when employees' hands are exposed to hazards such as those from… chemicals which produce an adverse effect on the skin or eyes…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §2 lists H304 (aspiration hazard) and H373 (target-organ toxicity through prolonged or repeated exposure). The DANGER signal word is co-driven by health H-codes alongside flammability. Petroleum distillate formula with high solvent load sprayed at close aerosol range warrants genuine respiratory protection — an organic-vapor cartridge or equivalent is the chemistry-based minimum for enclosed or semi-enclosed work spaces.”
— Gumout
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
UN GHS hazard statement
H373“May cause damage to organs through prolonged or repeated exposure”
UN GHS Rev. 9 (2021)
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
CarCareTruth's Analysis
Last reviewed May 16, 2026
TL;DR Clears typical MAF sensor fouling — 729 Amazon reviews at 4.7 stars report codes clear and idle returns. DANGER is co-driven by health H-codes alongside flammability: SDS §2 lists H304 (aspiration hazard), H361 (suspected reproductive toxicity), and H373 (target-organ toxicity). Prop 65 warning on the label. This is higher-hazard chemistry than IPA-based alternatives — respiratory protection and outdoor use are the chemistry-based minimums.
What it is and how it performs
Remove the sensor, insert the straw, spray 2–4 short bursts. The petroleum distillate formula dissolves oil mist and particulate from the sensing element. SDS §3 confirms no oily carrier; solvent evaporates within 3–5 minutes, leaving the element residue-free. Amazon reviews confirm consistent cleaning; independent before/after data logger captures are not yet documented for this newer listing.
Who should buy this — and who should skip it
Right pick for P0101 or P0102 from PCV oil-mist fouling on a gas or diesel sensor. Consider an IPA-based formula if you want DANGER from flammability only — several alternatives suit light fouling at a lower hazard tier. Skip any cleaner if the sensor is heavily fouled from oiled filter buildup; replacement is typically needed at that level.
Safety and environmental impact
DANGER from health H-codes alongside flammability: H304 (aspiration hazard), H315 (skin irritation), H361 (suspected reproductive toxicity — hexane fraction), H373 (target-organ toxicity through repeated exposure). Prop 65 warning cites benzene and methanol as trace impurities. Flash point −30°C — use outdoors or with the garage door open. SDS §2 flags the formula as toxic to aquatic life — keep overspray out of storm drains.
Frequently asked questions
Is this safe for hot-wire MAF sensors?▾
The manufacturer claims the formula is 'plastic-safe and non-damaging' and confirmed for use on 'delicate, expensive MAF sensors in both gasoline and diesel engines.' The SDS shows no oily carrier in Section 3 — the formula is entirely light aliphatic hydrocarbons and CO2 propellant. Community evidence for this specific product (Gumout 540041) is more limited than for longer-established MAF cleaners like CRC; Amazon reviews at 4.7 stars across 729 ratings report codes clearing and idle improving, but independent forum-level before/after data logger captures are not yet available for this product.
Will this leave residue on the sensor wire?▾
SDS Section 3 shows only light aliphatic hydrocarbons and CO2 — no petroleum oil, mineral oil, or heavy carrier that would leave a film. Flash point of −30°C confirms a very fast-evaporating, light solvent system. Community reports do not document residue issues. Allow 3–5 minutes of air-dry before reinstalling the sensor.
Why does the can say DANGER? Is it more hazardous than other MAF cleaners?▾
The DANGER signal word is co-driven by physical hazards (extremely flammable aerosol) and health H-codes — specifically H304 (aspiration hazard: may be fatal if swallowed and enters airways) and H361 (suspected of damaging fertility or the unborn child, from the hexane fraction). Many IPA-based MAF cleaners carry DANGER only from flammability; this formula's DANGER is partly from health chemistry. The practical spray-and-dry exposure duration is short, but the chemistry warrants more caution than an IPA-only formula — particularly respiratory protection and avoiding enclosed-space use.
Does it have a Prop 65 warning?▾
Yes. The Gumout product page carries a California Prop 65 warning citing benzene (cancer) and methanol (reproductive harm). The SDS Section 15 lists hexane (male reproductive toxicant) and methanol. Benzene and methanol appear as trace impurities in petroleum distillate fractions — they are not listed as intentional ingredients in SDS Section 3.
From the manufacturer
Marketing copy from Gumout, via Amazon. Not editorial.
- •Restores Sensor Accuracy & Fuel Economy - By safely removing contaminants like dirt, oil, and pollen from the MAF sensor, the cleaner helps restore the sensor’s ability to measure airflow accurately, which leads to improved fuel combustion.
- •Improves Throttle Response & Acceleration - A clean MAF sensor ensures that the engine receives the correct air-to-fuel mixture, resulting in faster and smoother throttle response and better acceleration performance.
- •Eliminates Rough Idle & Engine Hesitation - Contaminated MAF sensors can cause erratic idling, hesitation, and stalling. This cleaner helps eliminate rough idle, reduce hesitation, and ensure smoother engine operation.
- •Safe for All MAF Sensors - Formulated to be plastic-safe and non-damaging, this cleaner is safe for use on delicate, expensive MAF sensors in both gasoline and diesel engines, making it ideal for most modern vehicles.
- •Maximizes Horsepower & Engine Efficiency - By ensuring optimal air/fuel ratios, the cleaner helps engines produce maximum horsepower and maintain peak efficiency, supporting long-term performance and reduced emissions.
Weekly pick
One product, one safety verdict, every week. No spam.
Manufacturer videos
Manufacturer images
Manufacturer specifications
- Brand
- Gumout
- Item Form
- Aerosol
- Scent
- Unscented
- Specific Uses For Product
- Fleet and plant maintenance.
- Material Feature
- Clean
- Surface Recommendation
- Miscellaneous
- Special Features
- Restorer
- Contains Liquid Contents?
- Yes
- Recommended Uses For Product
- Fleet and plant maintenance.
- Material Features
- Clean
- Material Type Free
- en_AE
- Item Volume
- 11 Fluid Ounces
More from Gumout
More in MAF Sensor Cleaner
CRC
Mass Air Flow Sensor Cleaner (11 oz aerosol)
CCT 5.8 · DecentHealth 3.4
Johnsen's
4721 Mass Air Flow Sensor Cleaner
CCT 5.8 · DecentHealth 4.0
As an Amazon Associate and affiliate partner, CarCareTruth earns from qualifying purchases. Full disclosure
Community
0 postsShare how you use this product
Drop a quick comment or post a full review with photos and a star rating.
Sign in to postNew here? Create a free account.
Top Amazon review
↗External — Amazon's most-helpful review for context.