CarCareTruth Score
Decent.
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Prices may varyAbout this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
Health score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
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.
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From the manufacturer’s Safety Data Sheet, Section 8
“No H319 or H318 in SDS §2 mixture classification. Aerosol mist at face level during engine-bay work is the trigger · fine droplets can cause temporary irritation on direct contact.”
— Johnsen's
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
“No H315 or H317 in SDS §2 mixture classification. Brief incidental contact during typical MAF cleaning is the realistic scenario; the solvent load warrants care with repeated or extended skin contact.”
— Johnsen's
U.S. regulatory standard
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed [in excess of the PEL]…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
UN GHS hazard statement
H361“Suspected of damaging fertility or the unborn child”
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.
From the manufacturer’s Safety Data Sheet, Section 8
“DANGER signal word driven by H370 (organ damage, STOT SE 1) and H373 (STOT-RE Cat 2) at the §2 mixture level · petroleum distillate aerosol with genuine health-tier H-codes. The SDS identifies a health-based inhalation hazard, not a flammability-only DANGER. Use outdoors or with the garage door fully open.”
— Johnsen's
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination… When effective engineering controls are not feasible… appropriate respirators shall be used.”
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.
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.
This product ranks #4 of 5 in MAF Sensor Cleaner.Three above it ↓
Last reviewed May 26, 2026
TL;DR Clears typical oil-mist MAF fouling and buyers report codes stayed cleared · including a direct comparison to the category's dominant brand with equivalent results. The DANGER signal word is driven by health H-codes (organ damage, repeated-exposure organ risk) at the §2 mixture level, not flammability alone. Use outdoors or with the garage door open; air-dry 3·5 minutes before reinstalling the sensor.
Remove the MAF sensor, insert the straw, spray 2·4 short bursts, and air-dry 3·5 minutes before reinstalling. The formula evaporates quickly without visible residue per multiple owner reviews. Very high solvent load means one 10 oz can covers many cleaning sessions. Amazon evidence covers light-to-moderate oil-mist fouling; no before/after MAF voltage data from forums was found.
A practical choice for a home mechanic with a P0101/P0102 code and typical oil-mist fouling. Skip it if health profile matters: the DANGER classification reflects genuine health-tier chemistry and the SDS identifies a Prop 65 developmental toxicant. IPA-based formulas in the category score several points higher on health.
DANGER is driven by health H-codes at the §2 mixture level: organ damage (STOT SE 1) and repeated-exposure organ risk (STOT-RE Cat 2). The SDS §15 identifies a Prop 65 developmental toxicant in the ingredient list · the product listing's false negative has been overridden. Respiratory protection is chemistry-warranted; eye protection and gloves are advisable. Air-dry 3·5 minutes before reconnecting the harness. VOC content is 634 g/L (SDS §9). CARB compliance not stated. Naphtha carrier is not biodegradable. No aquatic toxicity codes in the §2 mixture classification.
The dominant alternative in the category is CRC Mass Air Flow Sensor Cleaner, and owners report Johnsen's performs the same for less money. Both are petroleum-distillate or IPA-based aerosols designed to flash off without residue. IPA-based formulas tend to score higher on health because the DANGER signal word on the Johnsen's formula is driven by genuine health H-codes (organ damage, suspected reproductive toxicity), not flammability alone. Never substitute brake cleaner, carb cleaner, or contact cleaner · those can leave residue or attack the delicate sensor wire.
It is formulated to evaporate quickly and leave no residue, which is what makes it appropriate for the fragile hot-wire or hot-plate element. Spray two to four short bursts onto the sensor without touching the wire, then air-dry 3 to 5 minutes before reinstalling and reconnecting the harness. Multiple owner reviews report codes cleared with no sensor damage, but never wipe or brush the element itself.
Marketing copy from Johnsen's, via Amazon. Not editorial.
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