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What is diagnostic code 33 on 89 Chevy astro van?

Anonymous

∙ 15y ago

Updated: 10/19/2022

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.

Wiki User

∙ 15y ago

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