Quote:
Originally Posted by thom4782
BTW:
If you found a "sensors not ready" condition when having the car smog checked, this probably means the trouble codes were recently cleared by someone. After clearing, it takes several drive cycles before the sensors are ready to start reading again.
The sensors don't detect a vacuum problem directly. They generally show codes like P0410 or P1411, which are secondary air injection system signal implausible codes. They are caused when there is a vacuum system leak, which prevents extra air from being pumped into the exhaust when the car starts from cold.
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+1 You need to put about 100 miles on the car for the data to be accumulated. Was the battery disconnected or replaced recently? That could clear the stored data.