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Can be the difference being laying out 20 or 300 bucks for this Manifold Absolute Pressure senor. Located at the the center of the intake manifold, one bolt one connector. This is what it looks like.



Main function is to retard ignition spark advance when hitting the gas, engine will stumble, assuming you have the 1.4L turbo engine. And you can see, has an O-Ring at the vacuum port.

This shows the location of all the key sensors.

View attachment 191602

That connector on the lower right are the pins for the MAP, 1 is 5V in, 2 is ground, 3 is the MAP sensor output. By using a hand operated vacuum pump, applying 5 v to pins 1 and 2, and a voltmeter between pins 3 and 2, the output voltage should increase proportional as vacuum is increased from 0 to 20"/Hg.

Over the long years, only had to replace one, major problem is that O'Ring seal, think I said before, I hate O-Rings, would just slap some RTV around it and stick it back in the hole, than good to go, maybe even forever.

Seen some on vehicles where they shove this piece of plastic inside of a hole, least the Cruze is using a bolt.

This is what a better one looks like off a Caddy, wow, two screws, and used a neoprene hose to a metal fitting on the intake manifold with clamps on it. Wasn't a problem.

 

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For a PT warranty, a "good" Chevy dealer can look up your VIN, read your mileage and tell you if your car is still under warranty. Finding a good dealer seems to be a major problem.
 
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