CarCareTruth Score
Decent.
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About 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.
No Safety Data Sheet on file.
CarCareTruth has not received a Safety Data Sheet from the manufacturer for this product. Hazard classification and PPE cannot be cited. Request an SDS from the manufacturer before use.
Last reviewed June 14, 2026
TL;DR Explicit O2-sensor-safe and catalytic-converter-safe claims appear on the label, but no SDS has been located, so the chemistry behind them is unverifiable. Front label shows a DANGER signal word and "VAPOR HARMFUL" warning; Proposition 65 applies. Health is 5.0 (no-SDS fixed score). Lungs-recommended PPE for aerosol use in an engine bay.
Remove the intake duct, prop the throttle plate open, spray short bursts, and wipe with a microfiber. The label claims the formula dissolves carbon and varnish from the throttle bore and plate while staying safe for O2 sensors and catalytic converters. The owner review base is still modest but confirms basic function; owners report clearing throttle-position-sensor error codes after a few cleaning passes. No US forum documentation found. Owners also flag that the included spray hose is hard to activate once attached.
A reasonable pick for a modern-EFI owner who wants an explicit O2/cat-safe label claim. Skip it if ingredient transparency matters · no SDS means the hazard profile is unknown. Skip it for GDI intake-valve carbon; aerosol TB cleaner cannot reach those deposits. Currently listed as unavailable on Amazon · verify stock before purchasing.
Front label: DANGER signal word, "EXTREMELY FLAMMABLE," "VAPOR HARMFUL," "SKIN AND EYE IRRITANT." No SDS to clarify H-codes. California Proposition 65 warning applies per the product listing. Use in a well-ventilated area; eye protection is the minimum for aerosol spray application. Do not discharge solvent residue to drains.
Hi-Gear explicitly claims this product is safe for oxygen sensors and catalytic converters · the claim appears in the Amazon feature bullets and a dedicated listing infographic. No SDS is available to verify the aromatic content that would chemically back this claim. The claim exists; the chemistry behind it cannot be independently confirmed at this time.
No Safety Data Sheet (SDS) has been located for Hi-Gear HG3247S despite an extensive search. CarCareTruth applies a fixed score of 3.0 for products without a publicly available SDS · not because the product is necessarily more dangerous than alternatives, but because the hazard data needed to score it accurately is unavailable. The score will be updated if an SDS is obtained.
As of the last data update, the product shows as unavailable on Amazon ('Currently unavailable'). It remains listed with active reviews, suggesting it was stocked in the past. Check the product listing for current availability.
The front label shows DANGER signal word with 'EXTREMELY FLAMMABLE' and 'VAPOR HARMFUL' warnings. Without an SDS it is unclear whether DANGER is driven purely by flammability or also by health-tier H-codes. The label language ('VAPOR HARMFUL') suggests at least some inhalation hazard beyond flammability alone. This puts it in more aggressive territory than the typical WARNING-label TB cleaner.
Marketing copy from Hi-Gear, via Amazon. Not editorial.
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