CarCareTruth Score
Mediocre, but wear gloves and ventilate.
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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
“H319 (eye irritation Cat 2A) confirmed in SDS §2 mixture classification. Aerosol mist during throttle-body spray is the chemistry-mapped trigger for temporary eye irritation.”
— Johnsen's
U.S. regulatory standard
29 CFR 1910.133(a)(1)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals…”
ANSI Z87.1 (incorporated via §1910.6)
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
“H315 (skin irritation Cat 2) confirmed in SDS §2 mixture classification. SDS §8 lists nitrile as hand protection.”
— Johnsen's
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
“DANGER signal word driven by health H-codes at §2 mixture level (H336 narcosis, H361, H373). SDS §8 specifies an organic-vapor cartridge where vapor exposure occurs. SDS §7 directs use in a well-ventilated area.”
— Johnsen's
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.
The published Safety Data Sheet for this product does not specify ventilation protection for consumer use.
Workplace context
29 CFR 1910.134(a); 1910.1000
“the primary objective shall be to prevent atmospheric contamination [via] accepted engineering control measures (for example, enclosure or confinement of the operation, general and local ventilation…).”
Triggered by GHS H336 on the SDS.
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
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 Throttle Body Cleaner.Three above it ↓
Last reviewed May 26, 2026
TL;DR Aggressively formulated aerosol for throttle-plate carbon and air-intake deposits. No O2-sensor-safe or cat-safe claim on the label · and high-aromatic solvent content is the chemistry that disqualifies a formula from those claims. DANGER from health H-codes (suspected reproductive toxin H361, organ-damage risk H373) plus a Prop 65 warning on the label. SDS §8 specifies an organic-vapor cartridge for vapor exposure; SDS §7 directs use in a well-ventilated area.
Remove the intake duct, hold the throttle plate open, spray into the bore, and wipe down. Fast-evaporating formula leaves no residue. No owner reviews at scoring time and no forum before/after documentation found · performance is rated from formula chemistry and brand claims. Use short bursts; excess solvent pooled in the intake will smoke briefly at first start.
Workable for a port-injected throttle body with heavy carbon where cleaning power is the priority. Skip it if you need confirmed O2/cat-safe chemistry · no such claim exists here and the aromatic content disqualifies it. Also skip for GDI engines: aerosol TB cleaner can't reach intake-valve carbon.
DANGER driven by health H-codes: H361 (suspected reproductive toxin), H373 (STOT-RE Cat 2), H336 (narcosis), H315 (skin irritation), H319 (eye irritation). Prop 65 warning on product label. SDS §8 specifies organic-vapor cartridge where vapor exposure occurs; nitrile listed as hand protection; SDS §7 directs well-ventilated area use. VOC 358 g/L (SDS §9); OTC compliant, not CARB. Not biodegradable. n-Heptane carries H400 + H410 at ingredient level · avoid storm drain discharge.
The Safety Data Sheet for Johnsen's 4724 Throttle Body and Air Intake Cleaner carries a DANGER signal word, with classified hazards including H223 (flammable aerosol); H280 (contains gas under pressure; may explode if heated); H315 (causes skin irritation). The Amazon listing also carries a California Prop 65 warning. See the PPE breakdown above for use-case-specific guidance translated from the SDS hazard codes.
CarCareTruth scores Johnsen's 4724 Throttle Body and Air Intake Cleaner at 5.3 out of 10 on the composite CCT score, with a health sub-score of 1.7/10. The CCT score blends real-world effectiveness, ingredient health impact pulled from the manufacturer's safety sheet, and environmental footprint against a published category rubric. See the methodology link on this page for the full scoring breakdown.
Per the Safety Data Sheet ingredient disclosure: SDS §3 (Version 1.2, 02/09/2017): Acetone (CAS 67-64-1) 30·50%; Toluene (CAS 108-88-3) 10·30%; Heptane, Branched Cyclic (CAS 426260-76-6) 18.768·19.55%; n-Heptane (CAS 142-82-5) 4.8875·8.7975%; Carbon Dioxide (CAS 124-38-9) 5·10%.
Marketing copy from Johnsen's, via Amazon. Not editorial.
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