Code 33 is a MAP sensor code. MAP sensor circuit error (signal is high meaning there is low vacuum getting to the sensor). Check the vacuum line going to the MAP sensor. Its usually located on the side of the breather, usually a green plug with three wires in line.
i have a code 12 on my chevy astro van what it means
Yes.
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The 1992 Chevrolet Astro Van ECM can be tested with a diagnostic tester. Most auto mechanic shops have diagnostic testers.
Trouble code P0102 means:Mass or volume circuit low input
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Trouble code P0172 means:System too rich (Bank 1)