1998 toyota tocoma


Old 12-14-04, 06:47 PM
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1998 toyota tocoma

My check engine light has come on I took it to the auto parts store and had the code read it says Catalyst Efficiency Below Threshold (Bank 1 )
I was wondering if any one knows what this means?
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Old 12-15-04, 03:04 AM
Join Date: Jun 2002
Location: Long Island, NY
Posts: 1,531
That means the cat is not doing anything.

You didn't say what it is 4 or 6. Mileage, service history?

Could be a dirty air filter (not necessarily now but at some point in time), dirty air mass sensor, air fuel sensor, etc. Something that effects the air fuel mixture. Could of had a misfire at one point.

If you correct the air fuel problem the cat may be able to "clean" itself, if not you may need to replace it.

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